http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_mixed/stddev_mixed.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_mixed/stddev_mixed.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_mixed/stddev_mixed.3.query.sqlpp
index 69ad38c..9eb1323 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_mixed/stddev_mixed.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_mixed/stddev_mixed.3.query.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
-* Description  : Run array_avg over an ordered list with mixed types
+* Description  : Run array_stddev over an ordered list with mixed types
 * Expected Res : Failure
 * Date         : March 5th 2018
 */

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
new file mode 100644
index 0000000..64538e8
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate-sql/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+* Description  : Run array_stddev_pop over an ordered list with mixed types
+* Expected Res : Failure
+* Date         : Feb 7th 2014
+*/
+
+select element array_stddev_pop((
+    select element x
+    from  [float('2.0'),'hello world',93847382783847382,date('2013-01-01')] as 
x
+));

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null/agg_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null/agg_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null/agg_null.3.query.sqlpp
index 062cb48..f1eb9dd 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null/agg_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null/agg_null.3.query.sqlpp
@@ -22,4 +22,4 @@
 * Date         : Jun 2nd 2013
 */
 
-{'count1':strict_count([null]),'average1':strict_avg([null]),'sum1':strict_sum([null]),'min1':strict_min([null]),'max1':strict_max([null]),'stddev1':strict_stddev([null]),'count2':strict_count({{null,null}}),'average2':strict_avg({{null,null}}),'sum2':strict_sum({{null,null}}),'min2':strict_min({{null,null}}),'max2':strict_max({{null,null}}),'stddev2':strict_stddev({{null,null}})};
+{'count1':strict_count([null]),'average1':strict_avg([null]),'sum1':strict_sum([null]),'min1':strict_min([null]),'max1':strict_max([null]),'stddev1':strict_stddev([null]),'stddev_pop1':strict_stddev_pop([null]),'count2':strict_count({{null,null}}),'average2':strict_avg({{null,null}}),'sum2':strict_sum({{null,null}}),'min2':strict_min({{null,null}}),'max2':strict_max({{null,null}}),'stddev2':strict_stddev({{null,null}}),'stddev_pop2':strict_stddev_pop({{null,null}})};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec/agg_null_rec.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec/agg_null_rec.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec/agg_null_rec.3.query.sqlpp
index 88c86f5..6796570 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec/agg_null_rec.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec/agg_null_rec.3.query.sqlpp
@@ -43,4 +43,7 @@ use test;
 )), 'stddev':test.strict_stddev((
     select element t.valplus
     from  Test as t
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element t.valplus
+    from  Test as t
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec_1/agg_null_rec_1.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec_1/agg_null_rec_1.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec_1/agg_null_rec_1.3.query.sqlpp
index bf316da..e58aefb 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec_1/agg_null_rec_1.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_null_rec_1/agg_null_rec_1.3.query.sqlpp
@@ -58,4 +58,10 @@ use test;
         select element t
         from  Test as t
     ) as i
+)),'stddev_pop':test.strict_stddev_pop((
+    select element i.val
+    from  (
+        select element t
+        from  Test as t
+    ) as i
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number/agg_number.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number/agg_number.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number/agg_number.3.query.sqlpp
index e8385ca..680f5c9 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number/agg_number.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number/agg_number.3.query.sqlpp
@@ -22,4 +22,4 @@
 * Date         : Jun 2nd 2013
 */
 
-{'count1':strict_count([float('2.0'),double('3.0'),93847382783847382,1]),'average1':strict_avg([float('2.0'),double('3.0'),93847382783847382,1]),'sum1':strict_sum([float('2.0'),double('3.0'),93847382783847382,1]),'min1':strict_min([float('2.0'),double('3.0'),93847382783847382,1]),'max1':strict_max([float('2.0'),double('3.0'),93847382783847382,1]),'stddev1':strict_stddev([float('2.0'),double('3.0'),93847382783847382,1]),'count2':strict_count({{float('2.0'),double('3.0'),93847382783847382,1}}),'average2':strict_avg({{float('2.0'),double('3.0'),93847382783847382,1}}),'sum2':strict_sum({{float('2.0'),double('3.0'),93847382783847382,1}}),'min2':strict_min({{float('2.0'),double('3.0'),93847382783847382,1}}),'max2':strict_max({{float('2.0'),double('3.0'),93847382783847382,1}}),'stddev2':strict_stddev([float('2.0'),double('3.0'),93847382783847382,1])};
\ No newline at end of file
+{'count1':strict_count([float('2.0'),double('3.0'),93847382783847382,1]),'average1':strict_avg([float('2.0'),double('3.0'),93847382783847382,1]),'sum1':strict_sum([float('2.0'),double('3.0'),93847382783847382,1]),'min1':strict_min([float('2.0'),double('3.0'),93847382783847382,1]),'max1':strict_max([float('2.0'),double('3.0'),93847382783847382,1]),'stddev1':strict_stddev([float('2.0'),double('3.0'),93847382783847382,1]),'stddev_pop1':strict_stddev_pop([float('2.0'),double('3.0'),93847382783847382,1]),'count2':strict_count({{float('2.0'),double('3.0'),93847382783847382,1}}),'average2':strict_avg({{float('2.0'),double('3.0'),93847382783847382,1}}),'sum2':strict_sum({{float('2.0'),double('3.0'),93847382783847382,1}}),'min2':strict_min({{float('2.0'),double('3.0'),93847382783847382,1}}),'max2':strict_max({{float('2.0'),double('3.0'),93847382783847382,1}}),'stddev2':strict_stddev([float('2.0'),double('3.0'),93847382783847382,1]),'stddev_pop2':strict_stddev_pop([float('2.0'),double('3.0'),
 93847382783847382,1])};
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number_rec/agg_number_rec.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number_rec/agg_number_rec.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number_rec/agg_number_rec.3.query.sqlpp
index 391e49d..1144a95 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number_rec/agg_number_rec.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/agg_number_rec/agg_number_rec.3.query.sqlpp
@@ -43,4 +43,7 @@ use test;
 )),'stddev':test.strict_stddev((
     select element t.valplus
     from  Test as t
+)),'stddev_pop':test.strict_stddev_pop((
+    select element t.valplus
+    from  Test as t
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.1.ddl.sqlpp
index bc2d063..7049419 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.1.ddl.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.1.ddl.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of avg without nulls.
+ * Description    : Tests the scalar version of stddev and stddev_pop without 
nulls.
  * Success        : Yes
  */
 

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.3.query.sqlpp
index e1d9437..a7c1497 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev/scalar_stddev.3.query.sqlpp
@@ -17,19 +17,26 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of stddev without nulls.
+ * Description    : Tests the scalar version of stddev and stddev_pop without 
nulls.
  * Success        : Yes
  */
 
 use test;
 
-
-with  i8 as 
test.strict_stddev([test.tinyint('1'),test.tinyint('2'),test.tinyint('3')]),
+{'stddev': (with  i8 as 
test.strict_stddev([test.tinyint('1'),test.tinyint('2'),test.tinyint('3')]),
       i16 as 
test.strict_stddev([test.smallint('1'),test.smallint('2'),test.smallint('3')]),
       i32 as 
test.strict_stddev([test.integer('1'),test.integer('2'),test.integer('3')]),
       i64 as 
test.strict_stddev([test.bigint('1'),test.bigint('2'),test.bigint('3')]),
       f as 
test.strict_stddev([test.float('1'),test.float('2'),test.float('3')]),
       d as 
test.strict_stddev([test.double('1'),test.double('2'),test.double('3')])
 select element i
-from  [i8,i16,i32,i64,f,d] as i
-;
+from  [i8,i16,i32,i64,f,d] as i),
+'stddev_pop': (with  i8 as 
test.strict_stddev_pop([test.tinyint('1'),test.tinyint('2'),test.tinyint('3')]),
+      i16 as 
test.strict_stddev_pop([test.smallint('1'),test.smallint('2'),test.smallint('3')]),
+      i32 as 
test.strict_stddev_pop([test.integer('1'),test.integer('2'),test.integer('3')]),
+      i64 as 
test.strict_stddev_pop([test.bigint('1'),test.bigint('2'),test.bigint('3')]),
+      f as 
test.strict_stddev_pop([test.float('1'),test.float('2'),test.float('3')]),
+      d as 
test.strict_stddev_pop([test.double('1'),test.double('2'),test.double('3')])
+select element i
+from  [i8,i16,i32,i64,f,d] as i)
+};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.1.ddl.sqlpp
index cb061c2..63c85db 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.1.ddl.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.1.ddl.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of avg with an empty list.
+ * Description    : Tests the scalar version of stddev and stddev_pop with an 
empty list.
  * Success        : Yes
  */
 

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.3.query.sqlpp
index 9dedcbd..bdccf51 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_empty/scalar_stddev_empty.3.query.sqlpp
@@ -17,8 +17,9 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of stddev with an empty list.
+ * Description    : Tests the scalar version of stddev and stddev_pop with an 
empty list.
  * Success        : Yes
  */
 
-select element strict_stddev([]);
+{'stddev': (select element strict_stddev([])),
+'stddev_pop': (select element strict_stddev_pop([]))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.1.ddl.sqlpp
index 03230ec..487d166 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.1.ddl.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.1.ddl.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of avg with nulls.
+ * Description    : Tests the scalar version of stddev and stddev_pop with 
nulls.
  * Success        : Yes
  */
 

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.3.query.sqlpp
index e8a3d18..d486633 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/scalar_stddev_null/scalar_stddev_null.3.query.sqlpp
@@ -17,19 +17,26 @@
  * under the License.
  */
 /*
- * Description    : Tests the scalar version of stddev with nulls.
+ * Description    : Tests the scalar version of stddev and stddev_pop with 
nulls.
  * Success        : Yes
  */
 
 use test;
 
-
-with  i8 as 
test.strict_stddev([test.tinyint('1'),test.tinyint('2'),test.tinyint('3'),null]),
+{'stddev': (with  i8 as 
test.strict_stddev([test.tinyint('1'),test.tinyint('2'),test.tinyint('3'),null]),
       i16 as 
test.strict_stddev([test.smallint('1'),test.smallint('2'),test.smallint('3'),null]),
       i32 as 
test.strict_stddev([test.integer('1'),test.integer('2'),test.integer('3'),null]),
       i64 as 
test.strict_stddev([test.bigint('1'),test.bigint('2'),test.bigint('3'),null]),
       f as 
test.strict_stddev([test.float('1'),test.float('2'),test.float('3'),null]),
       d as 
test.strict_stddev([test.double('1'),test.double('2'),test.double('3'),null])
 select element i
-from  [i8,i16,i32,i64,f,d] as i
-;
+from  [i8,i16,i32,i64,f,d] as i),
+'stddev_pop': (with  i8 as 
test.strict_stddev_pop([test.tinyint('1'),test.tinyint('2'),test.tinyint('3'),null]),
+      i16 as 
test.strict_stddev_pop([test.smallint('1'),test.smallint('2'),test.smallint('3'),null]),
+      i32 as 
test.strict_stddev_pop([test.integer('1'),test.integer('2'),test.integer('3'),null]),
+      i64 as 
test.strict_stddev_pop([test.bigint('1'),test.bigint('2'),test.bigint('3'),null]),
+      f as 
test.strict_stddev_pop([test.float('1'),test.float('2'),test.float('3'),null]),
+      d as 
test.strict_stddev_pop([test.double('1'),test.double('2'),test.double('3'),null])
+select element i
+from  [i8,i16,i32,i64,f,d] as i)
+};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double/serial_stddev_double.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double/serial_stddev_double.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double/serial_stddev_double.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double/serial_stddev_double.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double/serial_stddev_double.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double_null/serial_stddev_double_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double_null/serial_stddev_double_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double_null/serial_stddev_double_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double_null/serial_stddev_double_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_double_null/serial_stddev_double_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_empty/serial_stddev_empty.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_empty/serial_stddev_empty.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_empty/serial_stddev_empty.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_empty/serial_stddev_empty.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_empty/serial_stddev_empty.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float/serial_stddev_float.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float/serial_stddev_float.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float/serial_stddev_float.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float/serial_stddev_float.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float/serial_stddev_float.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float_null/serial_stddev_float_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float_null/serial_stddev_float_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float_null/serial_stddev_float_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float_null/serial_stddev_float_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_float_null/serial_stddev_float_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16/serial_stddev_int16.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16/serial_stddev_int16.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16/serial_stddev_int16.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16/serial_stddev_int16.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16/serial_stddev_int16.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16_null/serial_stddev_int16_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16_null/serial_stddev_int16_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16_null/serial_stddev_int16_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16_null/serial_stddev_int16_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int16_null/serial_stddev_int16_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32/serial_stddev_int32.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32/serial_stddev_int32.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32/serial_stddev_int32.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32/serial_stddev_int32.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32/serial_stddev_int32.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32_null/serial_stddev_int32_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32_null/serial_stddev_int32_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32_null/serial_stddev_int32_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32_null/serial_stddev_int32_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int32_null/serial_stddev_int32_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64/serial_stddev_int64.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64/serial_stddev_int64.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64/serial_stddev_int64.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64/serial_stddev_int64.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64/serial_stddev_int64.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64_null/serial_stddev_int64_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64_null/serial_stddev_int64_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64_null/serial_stddev_int64_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64_null/serial_stddev_int64_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int64_null/serial_stddev_int64_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8/serial_stddev_int8.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8/serial_stddev_int8.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8/serial_stddev_int8.3.query.sqlpp
index c142973..ad787f5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8/serial_stddev_int8.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8/serial_stddev_int8.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.val from g)) as stddev
+select gid, strict_stddev((select value g.val from g)) as stddev,
+   strict_stddev_pop((select value g.val from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(val as val);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8_null/serial_stddev_int8_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8_null/serial_stddev_int8_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8_null/serial_stddev_int8_null.3.query.sqlpp
index 9d62353..3ca4fec 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8_null/serial_stddev_int8_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_int8_null/serial_stddev_int8_null.3.query.sqlpp
@@ -19,7 +19,8 @@
 
 use test;
 
-select gid, strict_stddev((select value g.valplus from g)) as stddev
+select gid, strict_stddev((select value g.valplus from g)) as stddev,
+   strict_stddev_pop((select value g.valplus from g)) as stddev_pop
 from Test as t
 /* +hash */
 group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.ddl.sqlpp
new file mode 100644
index 0000000..da0bd7b
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.ddl.sqlpp
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+drop  dataverse test if exists;
+create  dataverse test;
+
+use test;
+
+
+create type test.TestType as
+{
+  id : bigint,
+  gid : bigint,
+  val : double
+};
+
+create  dataset Test(TestType) primary key id;

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.2.update.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.2.update.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.2.update.sqlpp
new file mode 100644
index 0000000..1b4eac9
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.2.update.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+insert into Test
+select element {'id':0,'gid':1,'val':double(4.32),'valplus':float('2.0')};
+insert into Test
+select element {'id':1,'gid':1,'val':double(5.32),'valplus':float('1.0')};
+insert into Test
+select element {'id':2,'gid':1,'val':double(6.32),'valplus':'hello world'};
+insert into Test
+select element {'id':3,'gid':1,'val':double(4.32),'valplus':double('3.0')};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.3.query.sqlpp
new file mode 100644
index 0000000..329fc59
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/serial_stddev_pop_mixed/serial_stddev_pop_mixed.3.query.sqlpp
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+ /*
+ * Description  : Run serial-stddev_pop over an ordered list with mixed types
+ * Expected Res : Failure
+ * Date         : March 5th 2018
+ */
+
+use test;
+
+select gid, strict_stddev_pop((select value g.valplus from g)) as stddev_pop
+from Test as t
+/* +hash */
+group by t.gid as gid group as g(valplus as valplus);

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_distinct/stddev_distinct.1.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_distinct/stddev_distinct.1.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_distinct/stddev_distinct.1.query.sqlpp
new file mode 100644
index 0000000..ee5b28c
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_distinct/stddev_distinct.1.query.sqlpp
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+ {
+   't1': to_bigint(strict_stddev(distinct [10,20,30,10,20,30,10])),
+   't2': to_bigint(strict_stddev(distinct [null,missing,null,missing])),
+   't3': to_bigint(strict_stddev(distinct 
[40,null,missing,50,40,null,missing,50,40])),
+   't4': to_bigint(strict_stddev(distinct [])),
+   't5': to_bigint(strict_stddev_pop(distinct [10,20,30,10,20,30,10])),
+   't6': to_bigint(strict_stddev_pop(distinct [null,missing,null,missing])),
+   't7': to_bigint(strict_stddev_pop(distinct 
[40,null,missing,50,40,null,missing,50,40])),
+   't8': to_bigint(strict_stddev_pop(distinct []))
+ };

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double/stddev_double.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double/stddev_double.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double/stddev_double.3.query.sqlpp
index c39ca57..6ec48bd 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double/stddev_double.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double/stddev_double.3.query.sqlpp
@@ -17,7 +17,10 @@
  * under the License.
  */
 
-select element strict_stddev((
+{'stddev':(select element strict_stddev((
     select element x
     from  [1.0,2.0,double('3.0')] as x
-));
+))), 'stddev_pop': (select element strict_stddev_pop((
+    select element x
+    from  [1.0,2.0,double('3.0')] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double_null/stddev_double_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double_null/stddev_double_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double_null/stddev_double_null.3.query.sqlpp
index b86d514..b8970f0 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double_null/stddev_double_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_double_null/stddev_double_null.3.query.sqlpp
@@ -19,8 +19,10 @@
 
 use test;
 
-
 {'stddev':test.strict_stddev((
     select element x.doubleField
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.doubleField
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.1.ddl.sqlpp
index 2ae248a..8ec3e08 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.1.ddl.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.1.ddl.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
- * Description    : Tests that avg aggregation correctly returns null for an 
empty stream,
+ * Description    : Tests that stddev aggregation correctly returns null for 
an empty stream,
  *                  without an aggregate combiner.
  * Success        : Yes
  */

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.3.query.sqlpp
index 4dd9c6c..7c02b5d 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_01/stddev_empty_01.3.query.sqlpp
@@ -17,16 +17,19 @@
  * under the License.
  */
 /*
- * Description    : Tests that avg aggregation correctly returns null for an 
empty stream,
+ * Description    : Tests that stddev aggregation correctly returns null for 
an empty stream,
  *                  without an aggregate combiner.
  * Success        : Yes
  */
 
 use test;
 
-
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
+    select element x
+    from  [1,2,3] as x
+    where (x > 10)
+))), 'stddev_pop': (select element test.strict_stddev_pop((
     select element x
     from  [1,2,3] as x
     where (x > 10)
-));
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.1.ddl.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.1.ddl.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.1.ddl.sqlpp
index c65aa35..ac9ee8f 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.1.ddl.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.1.ddl.sqlpp
@@ -17,7 +17,7 @@
  * under the License.
  */
 /*
- * Description    : Tests that avg aggregation correctly returns null for an 
empty stream,
+ * Description    : Tests that stddev aggregation correctly returns null for 
an empty stream,
  *                  with an aggregate combiner.
  * Success        : Yes
  */

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.3.query.sqlpp
index c874bee..00ef2a5 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_empty_02/stddev_empty_02.3.query.sqlpp
@@ -17,15 +17,17 @@
  * under the License.
  */
 /*
- * Description    : Tests that avg aggregation correctly returns null for an 
empty stream,
+ * Description    : Tests that stddev aggregation correctly returns null for 
an empty stream,
  *                  with an aggregate combiner.
  * Success        : Yes
  */
 
 use test;
 
-
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
+    select element x.val
+    from  Test as x
+))), 'stddev_pop': (select element test.strict_stddev_pop((
     select element x.val
     from  Test as x
-));
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float/stddev_float.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float/stddev_float.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float/stddev_float.3.query.sqlpp
index 4639508..7d93d5f 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float/stddev_float.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float/stddev_float.3.query.sqlpp
@@ -20,7 +20,10 @@
 use test;
 
 
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
     select element x
     from  [test.float('1'),test.float('2'),test.float('3')] as x
-));
+))), 'stddev_pop': (select element test.strict_stddev_pop((
+    select element x
+    from  [test.float('1'),test.float('2'),test.float('3')] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float_null/stddev_float_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float_null/stddev_float_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float_null/stddev_float_null.3.query.sqlpp
index 0efd9c5..8953da9 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float_null/stddev_float_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_float_null/stddev_float_null.3.query.sqlpp
@@ -23,4 +23,7 @@ use test;
 {'stddev':test.strict_stddev((
     select element x.floatField
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.floatField
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16/stddev_int16.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16/stddev_int16.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16/stddev_int16.3.query.sqlpp
index 58f3e41..3c8b633 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16/stddev_int16.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16/stddev_int16.3.query.sqlpp
@@ -20,7 +20,10 @@
 use test;
 
 
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
     select element x
     from  [test.smallint('1'),test.smallint('2'),test.smallint('3')] as x
-));
+))), 'stddev_pop': (select element test.strict_stddev_pop((
+    select element x
+    from  [test.smallint('1'),test.smallint('2'),test.smallint('3')] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16_null/stddev_int16_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16_null/stddev_int16_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16_null/stddev_int16_null.3.query.sqlpp
index 7608be6..314b28f 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16_null/stddev_int16_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int16_null/stddev_int16_null.3.query.sqlpp
@@ -23,4 +23,7 @@ use test;
 {'stddev':test.strict_stddev((
     select element x.int16Field
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.int16Field
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32/stddev_int32.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32/stddev_int32.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32/stddev_int32.3.query.sqlpp
index 90dd3b3..9f4fd0d 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32/stddev_int32.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32/stddev_int32.3.query.sqlpp
@@ -20,7 +20,10 @@
 use test;
 
 
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
     select element x
     from  [1,2,3] as x
-));
+))), 'stddev_pop': (select element test.strict_stddev_pop((
+    select element x
+    from  [1,2,3] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32_null/stddev_int32_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32_null/stddev_int32_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32_null/stddev_int32_null.3.query.sqlpp
index 42ea3a4..404532c 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32_null/stddev_int32_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int32_null/stddev_int32_null.3.query.sqlpp
@@ -23,4 +23,7 @@ use test;
 {'stddev':test.strict_stddev((
     select element x.int32Field
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.int32Field
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64/stddev_int64.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64/stddev_int64.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64/stddev_int64.3.query.sqlpp
index 3c7269a..4d42043 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64/stddev_int64.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64/stddev_int64.3.query.sqlpp
@@ -20,7 +20,10 @@
 use test;
 
 
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
     select element x
     from  [test.bigint('1'),test.bigint('2'),test.bigint('3')] as x
-));
+))), 'stddev_pop': (select element test.strict_stddev_pop((
+    select element x
+    from  [test.bigint('1'),test.bigint('2'),test.bigint('3')] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64_null/stddev_int64_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64_null/stddev_int64_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64_null/stddev_int64_null.3.query.sqlpp
index 1304170..a5808a8 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64_null/stddev_int64_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int64_null/stddev_int64_null.3.query.sqlpp
@@ -23,4 +23,7 @@ use test;
 {'stddev':test.strict_stddev((
     select element x.int64Field
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.int64Field
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8/stddev_int8.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8/stddev_int8.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8/stddev_int8.3.query.sqlpp
index 310f840..ba6d178 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8/stddev_int8.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8/stddev_int8.3.query.sqlpp
@@ -20,7 +20,10 @@
 use test;
 
 
-select element test.strict_stddev((
+{'stddev': (select element test.strict_stddev((
     select element x
     from  [test.tinyint('1'),test.tinyint('2'),test.tinyint('3')] as x
-));
+))), 'stddev_pop': (select element test.strict_stddev_pop((
+    select element x
+    from  [test.tinyint('1'),test.tinyint('2'),test.tinyint('3')] as x
+)))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8_null/stddev_int8_null.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8_null/stddev_int8_null.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8_null/stddev_int8_null.3.query.sqlpp
index 25f0fee..f1d1c9b 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8_null/stddev_int8_null.3.query.sqlpp
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_int8_null/stddev_int8_null.3.query.sqlpp
@@ -23,4 +23,7 @@ use test;
 {'stddev':test.strict_stddev((
     select element x.int8Field
     from  Numeric as x
+)), 'stddev_pop':test.strict_stddev_pop((
+    select element x.int8Field
+    from  Numeric as x
 ))};

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
new file mode 100644
index 0000000..d068bb2
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/aggregate/stddev_pop_mixed/stddev_pop_mixed.3.query.sqlpp
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+* Description  : Run stddev_pop over an ordered list with mixed types
+* Expected Res : Failure
+* Date         : Jun 2nd 2013
+*/
+
+select element strict_stddev_pop((
+    select element x
+    from  [float('2.0'),'hello world',93847382783847382,date('2013-01-01')] as 
x
+));

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null/agg_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null/agg_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null/agg_null.1.adm
index 53910f3..a8c918b 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null/agg_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null/agg_null.1.adm
@@ -1 +1 @@
-{ "sql-count1": 0, "average1": null, "sql-sum1": null, "sql-min1": null, 
"sql-max1": null, "sql-stddev1": null, "sql-count2": 0, "average2": null, 
"sql-sum2": null, "sql-min2": null, "sql-max2": null, "sql-stddev2": null }
+{ "sql-count1": 0, "average1": null, "sql-sum1": null, "sql-min1": null, 
"sql-max1": null, "sql-stddev1": null, "sql-stddev_pop1": null, "sql-count2": 
0, "average2": null, "sql-sum2": null, "sql-min2": null, "sql-max2": null, 
"sql-stddev2": null, "sql-stddev_pop2": null }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec/agg_null_rec.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec/agg_null_rec.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec/agg_null_rec.1.adm
index 425ca45..99d052a 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec/agg_null_rec.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec/agg_null_rec.1.adm
@@ -1 +1 @@
-{ "sql-count": 2, "average": 26.0, "sql-stddev": 7.0710678118654755, 
"sql-sum": 52, "sql-min": 21, "sql-max": 31 }
+{ "sql-count": 2, "average": 26.0, "sql-stddev": 7.0710678118654755, 
"sql-stddev_pop": 5.0, "sql-sum": 52, "sql-min": 21, "sql-max": 31 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec_1/agg_null_rec.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec_1/agg_null_rec.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec_1/agg_null_rec.1.adm
index 4d9b33d..988d2e4 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec_1/agg_null_rec.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_null_rec_1/agg_null_rec.1.adm
@@ -1 +1 @@
-{ "sql-count": 3, "average": 5.32, "sql-sum": 15.96, "sql-stddev": 
2.720510431232472E16, "sql-min": 473847, "sql-max": 38473827484738239 }
+{ "sql-count": 3, "average": 5.32, "sql-sum": 15.96, "sql-stddev": 
2.720510431232472E16, "sql-stddev_pop": 1.9236913742132196E16, "sql-min": 
473847, "sql-max": 38473827484738239 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number/agg_number.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number/agg_number.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number/agg_number.1.adm
index 2ea1357..37f109c 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number/agg_number.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number/agg_number.1.adm
@@ -1 +1 @@
-{ "sql-count1": 4, "average1": 2.3461845695961844E16, "sql-stddev1": 
4.6923691391923688E16, "sql-count2": 4, "average2": 2.3461845695961844E16, 
"sql-stddev2": 4.6923691391923688E16, "sql-sum1": 9.3847382783847376E16, 
"sql-min1": 1.0, "sql-max1": 9.3847382783847376E16, "sql-sum2": 
9.3847382783847376E16, "sql-min2": 1.0, "sql-max2": 9.3847382783847376E16 }
+{ "sql-count1": 4, "average1": 2.3461845695961844E16, "sql-stddev1": 
4.6923691391923688E16, "sql-stddev_pop1": 4.0637108784747104E16, "sql-count2": 
4, "average2": 2.3461845695961844E16, "sql-stddev2": 4.6923691391923688E16, 
"sql-stddev_pop2": 4.0637108784747104E16, "sql-sum1": 9.3847382783847376E16, 
"sql-min1": 1.0, "sql-max1": 9.3847382783847376E16, "sql-sum2": 
9.3847382783847376E16, "sql-min2": 1.0, "sql-max2": 9.3847382783847376E16 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number_rec/agg_number_rec.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number_rec/agg_number_rec.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number_rec/agg_number_rec.1.adm
index fdc01c8..19f61fd 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number_rec/agg_number_rec.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/agg_number_rec/agg_number_rec.1.adm
@@ -1 +1 @@
-{ "sql-count": 3, "average": 1.2824609161579424E16, "sql-stddev": 
2.2212874655068836E16, "sql-sum": 3.8473827484738272E16, "sql-min": 2.0, 
"sql-max": 3.847382748473824E16 }
+{ "sql-count": 3, "average": 1.2824609161579424E16, "sql-stddev": 
2.2212874655068836E16, "sql-stddev_pop": 1.8136736208439848E16, "sql-sum": 
3.8473827484738272E16, "sql-min": 2.0, "sql-max": 3.847382748473824E16 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev/scalar_stddev.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev/scalar_stddev.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev/scalar_stddev.1.adm
index 325ebd5..16c838c 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev/scalar_stddev.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev/scalar_stddev.1.adm
@@ -1,6 +1 @@
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
+{ "stddev": [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ], "stddev_pop": [ 
0.816496580927726, 0.816496580927726, 0.816496580927726, 0.816496580927726, 
0.816496580927726, 0.816496580927726 ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_empty/scalar_stddev_empty.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_empty/scalar_stddev_empty.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_empty/scalar_stddev_empty.1.adm
index 19765bd..eb24dcb 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_empty/scalar_stddev_empty.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_empty/scalar_stddev_empty.1.adm
@@ -1 +1 @@
-null
+{ "stddev": [ null ], "stddev_pop": [ null ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_null/scalar_stddev_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_null/scalar_stddev_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_null/scalar_stddev_null.1.adm
index 325ebd5..16c838c 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_null/scalar_stddev_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/scalar_stddev_null/scalar_stddev_null.1.adm
@@ -1,6 +1 @@
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
+{ "stddev": [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ], "stddev_pop": [ 
0.816496580927726, 0.816496580927726, 0.816496580927726, 0.816496580927726, 
0.816496580927726, 0.816496580927726 ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double/serial_stddev_double.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double/serial_stddev_double.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double/serial_stddev_double.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double/serial_stddev_double.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double/serial_stddev_double.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double_null/serial_stddev_double_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double_null/serial_stddev_double_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double_null/serial_stddev_double_null.1.adm
index c6fb3a0..c71ba21 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double_null/serial_stddev_double_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_double_null/serial_stddev_double_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 2.2212874654736076E16 }
+{ "gid": 1, "stddev": 2.2212874654736076E16, "stddev_pop": 
1.8136736208168148E16 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float/serial_stddev_float.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float/serial_stddev_float.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float/serial_stddev_float.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float/serial_stddev_float.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float/serial_stddev_float.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float_null/serial_stddev_float_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float_null/serial_stddev_float_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float_null/serial_stddev_float_null.1.adm
index 81fb89a..daa09e6 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float_null/serial_stddev_float_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_float_null/serial_stddev_float_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 1.0 }
+{ "gid": 1, "stddev": 1.0, "stddev_pop": 0.816496580927726 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16/serial_stddev_int16.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16/serial_stddev_int16.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16/serial_stddev_int16.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16/serial_stddev_int16.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16/serial_stddev_int16.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16_null/serial_stddev_int16_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16_null/serial_stddev_int16_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16_null/serial_stddev_int16_null.1.adm
index 81fb89a..daa09e6 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16_null/serial_stddev_int16_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int16_null/serial_stddev_int16_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 1.0 }
+{ "gid": 1, "stddev": 1.0, "stddev_pop": 0.816496580927726 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32/serial_stddev_int32.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32/serial_stddev_int32.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32/serial_stddev_int32.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32/serial_stddev_int32.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32/serial_stddev_int32.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32_null/serial_stddev_int32_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32_null/serial_stddev_int32_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32_null/serial_stddev_int32_null.1.adm
index 81fb89a..daa09e6 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32_null/serial_stddev_int32_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int32_null/serial_stddev_int32_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 1.0 }
+{ "gid": 1, "stddev": 1.0, "stddev_pop": 0.816496580927726 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64/serial_stddev_int64.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64/serial_stddev_int64.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64/serial_stddev_int64.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64/serial_stddev_int64.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64/serial_stddev_int64.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64_null/serial_stddev_int64_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64_null/serial_stddev_int64_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64_null/serial_stddev_int64_null.1.adm
index 81fb89a..daa09e6 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64_null/serial_stddev_int64_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int64_null/serial_stddev_int64_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 1.0 }
+{ "gid": 1, "stddev": 1.0, "stddev_pop": 0.816496580927726 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8/serial_stddev_int8.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8/serial_stddev_int8.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8/serial_stddev_int8.1.adm
index d2bef52..4e89687 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8/serial_stddev_int8.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8/serial_stddev_int8.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 0.8944271909999159 }
+{ "gid": 1, "stddev": 0.8944271909999159, "stddev_pop": 0.8 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8_null/serial_stddev_int8_null.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8_null/serial_stddev_int8_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8_null/serial_stddev_int8_null.1.adm
index 81fb89a..daa09e6 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8_null/serial_stddev_int8_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_int8_null/serial_stddev_int8_null.1.adm
@@ -1 +1 @@
-{ "gid": 1, "stddev": 1.0 }
+{ "gid": 1, "stddev": 1.0, "stddev_pop": 0.816496580927726 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.adm
new file mode 100644
index 0000000..e3b97f5
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/serial_stddev_pop_mixed/serial_stddev_pop_mixed.1.adm
@@ -0,0 +1 @@
+[  ]

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_distinct/stddev_distinct.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_distinct/stddev_distinct.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_distinct/stddev_distinct.1.adm
new file mode 100644
index 0000000..51a2ce7
--- /dev/null
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_distinct/stddev_distinct.1.adm
@@ -0,0 +1 @@
+{ "t1": 10, "t2": null, "t3": 7, "t4": null, "t5": 8, "t6": null, "t7": 5, 
"t8": null }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double/stddev_double.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double/stddev_double.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double/stddev_double.1.adm
index d3827e7..653259d 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double/stddev_double.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double/stddev_double.1.adm
@@ -1 +1 @@
-1.0
+{ "stddev": [ 1.0 ], "stddev_pop": [ 0.816496580927726 ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double_null/stddev_double_null.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double_null/stddev_double_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double_null/stddev_double_null.1.adm
index 74efe52..4f788be 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double_null/stddev_double_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_double_null/stddev_double_null.1.adm
@@ -1 +1 @@
-{ "stddev": 0.0 }
+{ "stddev": 0.0, "stddev_pop": 0.0 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_01/stddev_empty_01.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_01/stddev_empty_01.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_01/stddev_empty_01.1.adm
index 19765bd..eb24dcb 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_01/stddev_empty_01.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_01/stddev_empty_01.1.adm
@@ -1 +1 @@
-null
+{ "stddev": [ null ], "stddev_pop": [ null ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_02/stddev_empty_02.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_02/stddev_empty_02.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_02/stddev_empty_02.1.adm
index 19765bd..eb24dcb 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_02/stddev_empty_02.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_empty_02/stddev_empty_02.1.adm
@@ -1 +1 @@
-null
+{ "stddev": [ null ], "stddev_pop": [ null ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float/stddev_float.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float/stddev_float.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float/stddev_float.1.adm
index d3827e7..653259d 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float/stddev_float.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float/stddev_float.1.adm
@@ -1 +1 @@
-1.0
+{ "stddev": [ 1.0 ], "stddev_pop": [ 0.816496580927726 ] }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float_null/stddev_float_null.1.adm
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diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float_null/stddev_float_null.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float_null/stddev_float_null.1.adm
index 74efe52..4f788be 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float_null/stddev_float_null.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_float_null/stddev_float_null.1.adm
@@ -1 +1 @@
-{ "stddev": 0.0 }
+{ "stddev": 0.0, "stddev_pop": 0.0 }

http://git-wip-us.apache.org/repos/asf/asterixdb/blob/11d5b281/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_int16/stddev_int16.1.adm
----------------------------------------------------------------------
diff --git 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_int16/stddev_int16.1.adm
 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_int16/stddev_int16.1.adm
index d3827e7..653259d 100644
--- 
a/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_int16/stddev_int16.1.adm
+++ 
b/asterixdb/asterix-app/src/test/resources/runtimets/results/aggregate-sql/stddev_int16/stddev_int16.1.adm
@@ -1 +1 @@
-1.0
+{ "stddev": [ 1.0 ], "stddev_pop": [ 0.816496580927726 ] }

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