http://git-wip-us.apache.org/repos/asf/hive/blob/8f7c5788/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out
----------------------------------------------------------------------
diff --git 
a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out 
b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out
index 9e60536..60c35fa 100644
--- a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out
+++ b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_6.q.out
@@ -84,63 +84,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: c
+                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    predicate: value is not null (type: boolean)
+                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: _col0 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col0 (type: string)
+                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: _col1 (type: string)
-                          sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: _col1 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col1 (type: string)
+                        Statistics: Num rows: 450 Data size: 80539 Basic 
stats: COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: c
-                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
-                    predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: value (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: _col0 (type: string)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -150,9 +153,25 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
-                  1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                  0 _col0 (type: string)
+                  1 _col1 (type: string)
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 55055 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -162,7 +181,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -211,63 +230,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: d
+                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    predicate: value is not null (type: boolean)
+                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: _col0 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col0 (type: string)
+                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: _col1 (type: string)
-                          sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: _col1 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col1 (type: string)
+                        Statistics: Num rows: 450 Data size: 80539 Basic 
stats: COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: d
-                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
-                    predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: value (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: _col0 (type: string)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -277,9 +299,25 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
-                  1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                  0 _col0 (type: string)
+                  1 _col1 (type: string)
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 55055 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -289,7 +327,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -338,63 +376,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: h
+                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    predicate: value is not null (type: boolean)
+                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: _col0 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col0 (type: string)
+                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: _col1 (type: string)
-                          sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: _col1 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col1 (type: string)
+                        Statistics: Num rows: 450 Data size: 80539 Basic 
stats: COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: h
-                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
-                    predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: value (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: _col0 (type: string)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -404,9 +445,25 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
-                  1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                  0 _col0 (type: string)
+                  1 _col1 (type: string)
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 55055 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -416,7 +473,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -465,63 +522,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: c
+                  Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: UDFToDouble(_col0) (type: double)
+                        sort order: +
+                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
+                        Statistics: Num rows: 500 Data size: 43500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col0
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: UDFToDouble(_col0) (type: double)
-                          sort order: +
-                          Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: UDFToDouble(_col0) (type: double)
+                        sort order: +
+                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: c
-                  Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: key (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: UDFToDouble(_col0) (type: double)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
-                        Statistics: Num rows: 500 Data size: 43500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -533,7 +593,23 @@ STAGE PLANS:
                 keys:
                   0 UDFToDouble(_col0) (type: double)
                   1 UDFToDouble(_col0) (type: double)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 47850 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 47850 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 52635 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -543,7 +619,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -598,36 +674,36 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Map Operator Tree:
                 TableScan
                   alias: c
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Merge Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -636,7 +712,7 @@ STAGE PLANS:
                           0 _col0 (type: int)
                           1 _col0 (type: int)
                           2 _col0 (type: int)
-                        Statistics: Num rows: 1100 Data size: 11686 Basic 
stats: COMPLETE Column stats: NONE
+                        Statistics: Num rows: 1045 Data size: 3977 Basic 
stats: COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -702,57 +778,57 @@ STAGE PLANS:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                  Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                    Select Operator
-                      expressions: key (type: int)
-                      outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-            Map Operator Tree:
-                TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+            Map Operator Tree:
+                TableScan
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
+                  Filter Operator
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                    Select Operator
+                      expressions: key (type: int)
+                      outputColumnNames: _col0
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Merge Join Operator
                         condition map:
                              Inner Join 0 to 1
                         keys:
                           0 _col0 (type: int)
                           1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
+                        outputColumnNames: _col2
+                        Statistics: Num rows: 522 Data size: 1988 Basic stats: 
COMPLETE Column stats: NONE
                         Reduce Output Operator
-                          key expressions: _col1 (type: string)
+                          key expressions: _col2 (type: string)
                           sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                          Map-reduce partition columns: _col2 (type: string)
+                          Statistics: Num rows: 522 Data size: 1988 Basic 
stats: COMPLETE Column stats: NONE
             Execution mode: llap
         Map 5 
             Map Operator Tree:
                 TableScan
                   alias: c
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 87584 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 83204 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 83204 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 475 Data size: 83204 Basic 
stats: COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -762,9 +838,9 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
+                  0 _col2 (type: string)
                   1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                Statistics: Num rows: 574 Data size: 2186 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -823,63 +899,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: c
+                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    predicate: value is not null (type: boolean)
+                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: _col0 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col0 (type: string)
+                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: _col1 (type: string)
-                          sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: _col1 (type: string)
+                        sort order: +
+                        Map-reduce partition columns: _col1 (type: string)
+                        Statistics: Num rows: 450 Data size: 80539 Basic 
stats: COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: c
-                  Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
-                    predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: value (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 45500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: _col0 (type: string)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 45500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -889,9 +968,25 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
-                  1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                  0 _col0 (type: string)
+                  1 _col1 (type: string)
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 50050 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 55055 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -901,7 +996,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -950,63 +1045,66 @@ STAGE PLANS:
 #### A masked pattern was here ####
       Edges:
         Reducer 2 <- Map 1 (SIMPLE_EDGE), Map 5 (SIMPLE_EDGE)
-        Reducer 3 <- Reducer 2 (CUSTOM_SIMPLE_EDGE)
+        Reducer 3 <- Map 6 (SIMPLE_EDGE), Reducer 2 (SIMPLE_EDGE)
+        Reducer 4 <- Reducer 3 (CUSTOM_SIMPLE_EDGE)
 #### A masked pattern was here ####
       Vertices:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  alias: c
+                  Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
                     Select Operator
-                      expressions: key (type: int)
+                      expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Reduce Output Operator
+                        key expressions: UDFToDouble(_col0) (type: double)
+                        sort order: +
+                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
+                        Statistics: Num rows: 500 Data size: 43500 Basic 
stats: COMPLETE Column stats: COMPLETE
+            Execution mode: llap
+            LLAP IO: no inputs
+        Map 5 
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                      Merge Join Operator
-                        condition map:
-                             Inner Join 0 to 1
-                        keys:
-                          0 _col0 (type: int)
-                          1 _col0 (type: int)
-                        outputColumnNames: _col0
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
-                        Reduce Output Operator
-                          key expressions: UDFToDouble(_col0) (type: double)
-                          sort order: +
-                          Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                      Reduce Output Operator
+                        key expressions: UDFToDouble(_col0) (type: double)
+                        sort order: +
+                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                        value expressions: _col0 (type: int)
             Execution mode: llap
-        Map 5 
+            LLAP IO: no inputs
+        Map 6 
             Map Operator Tree:
                 TableScan
-                  alias: c
-                  Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
-                      expressions: key (type: string)
+                      expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 43500 Basic stats: 
COMPLETE Column stats: COMPLETE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
-                        key expressions: UDFToDouble(_col0) (type: double)
+                        key expressions: _col0 (type: int)
                         sort order: +
-                        Map-reduce partition columns: UDFToDouble(_col0) 
(type: double)
-                        Statistics: Num rows: 500 Data size: 43500 Basic 
stats: COMPLETE Column stats: COMPLETE
+                        Map-reduce partition columns: _col0 (type: int)
+                        Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -1018,7 +1116,23 @@ STAGE PLANS:
                 keys:
                   0 UDFToDouble(_col0) (type: double)
                   1 UDFToDouble(_col0) (type: double)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                outputColumnNames: _col1
+                Statistics: Num rows: 550 Data size: 47850 Basic stats: 
COMPLETE Column stats: NONE
+                Reduce Output Operator
+                  key expressions: _col1 (type: int)
+                  sort order: +
+                  Map-reduce partition columns: _col1 (type: int)
+                  Statistics: Num rows: 550 Data size: 47850 Basic stats: 
COMPLETE Column stats: NONE
+        Reducer 3 
+            Execution mode: llap
+            Reduce Operator Tree:
+              Merge Join Operator
+                condition map:
+                     Inner Join 0 to 1
+                keys:
+                  0 _col1 (type: int)
+                  1 _col0 (type: int)
+                Statistics: Num rows: 605 Data size: 52635 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash
@@ -1028,7 +1142,7 @@ STAGE PLANS:
                     sort order: 
                     Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE 
Column stats: NONE
                     value expressions: _col0 (type: bigint)
-        Reducer 3 
+        Reducer 4 
             Execution mode: llap
             Reduce Operator Tree:
               Group By Operator
@@ -1083,36 +1197,36 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Map Operator Tree:
                 TableScan
                   alias: c
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Merge Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -1121,7 +1235,7 @@ STAGE PLANS:
                           0 _col0 (type: int)
                           1 _col0 (type: int)
                           2 _col0 (type: int)
-                        Statistics: Num rows: 1100 Data size: 11686 Basic 
stats: COMPLETE Column stats: NONE
+                        Statistics: Num rows: 1045 Data size: 3977 Basic 
stats: COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -1187,57 +1301,57 @@ STAGE PLANS:
         Map 1 
             Map Operator Tree:
                 TableScan
-                  alias: b
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                  Filter Operator
-                    predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-                    Select Operator
-                      expressions: key (type: int)
-                      outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
-            Map Operator Tree:
-                TableScan
                   alias: a
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 89488 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: (key is not null and value is not null) (type: 
boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: int), value (type: string)
                       outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 450 Data size: 80539 Basic stats: 
COMPLETE Column stats: NONE
+            Map Operator Tree:
+                TableScan
+                  alias: b
+                  Statistics: Num rows: 500 Data size: 1904 Basic stats: 
COMPLETE Column stats: NONE
+                  Filter Operator
+                    predicate: key is not null (type: boolean)
+                    Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
+                    Select Operator
+                      expressions: key (type: int)
+                      outputColumnNames: _col0
+                      Statistics: Num rows: 475 Data size: 1808 Basic stats: 
COMPLETE Column stats: NONE
                       Merge Join Operator
                         condition map:
                              Inner Join 0 to 1
                         keys:
                           0 _col0 (type: int)
                           1 _col0 (type: int)
-                        outputColumnNames: _col1
-                        Statistics: Num rows: 550 Data size: 5843 Basic stats: 
COMPLETE Column stats: NONE
+                        outputColumnNames: _col2
+                        Statistics: Num rows: 522 Data size: 1988 Basic stats: 
COMPLETE Column stats: NONE
                         Reduce Output Operator
-                          key expressions: _col1 (type: string)
+                          key expressions: _col2 (type: string)
                           sort order: +
-                          Map-reduce partition columns: _col1 (type: string)
-                          Statistics: Num rows: 550 Data size: 5843 Basic 
stats: COMPLETE Column stats: NONE
+                          Map-reduce partition columns: _col2 (type: string)
+                          Statistics: Num rows: 522 Data size: 1988 Basic 
stats: COMPLETE Column stats: NONE
             Execution mode: llap
         Map 5 
             Map Operator Tree:
                 TableScan
                   alias: c
-                  Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 500 Data size: 87584 Basic stats: 
COMPLETE Column stats: NONE
                   Filter Operator
                     predicate: value is not null (type: boolean)
-                    Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 475 Data size: 83204 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: value (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 475 Data size: 83204 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 500 Data size: 5312 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 475 Data size: 83204 Basic 
stats: COMPLETE Column stats: NONE
             Execution mode: llap
             LLAP IO: no inputs
         Reducer 2 
@@ -1247,9 +1361,9 @@ STAGE PLANS:
                 condition map:
                      Inner Join 0 to 1
                 keys:
-                  0 _col1 (type: string)
+                  0 _col2 (type: string)
                   1 _col0 (type: string)
-                Statistics: Num rows: 605 Data size: 6427 Basic stats: 
COMPLETE Column stats: NONE
+                Statistics: Num rows: 574 Data size: 2186 Basic stats: 
COMPLETE Column stats: NONE
                 Group By Operator
                   aggregations: count()
                   mode: hash

http://git-wip-us.apache.org/repos/asf/hive/blob/8f7c5788/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_7.q.out
----------------------------------------------------------------------
diff --git 
a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_7.q.out 
b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_7.q.out
index 13d3acc..83d5a96 100644
--- a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_7.q.out
+++ b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_7.q.out
@@ -135,22 +135,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 4 Data size: 484 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 0
                         auto parallelism: true
             Execution mode: llap
@@ -263,16 +263,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 54 Data size: 15252 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -283,7 +283,7 @@ STAGE PLANS:
                         input vertices:
                           0 Map 1
                         Position of Big Table: 1
-                        Statistics: Num rows: 59 Data size: 6525 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 57 Data size: 16155 Basic stats: 
COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -480,16 +480,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 54 Data size: 15252 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -500,7 +500,7 @@ STAGE PLANS:
                         input vertices:
                           1 Map 3
                         Position of Big Table: 0
-                        Statistics: Num rows: 59 Data size: 6525 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 57 Data size: 16155 Basic stats: 
COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -623,22 +623,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 4 Data size: 484 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 1
                         auto parallelism: true
             Execution mode: llap
@@ -825,16 +825,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 54 Data size: 15252 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 54 Data size: 5932 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 52 Data size: 14687 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -845,7 +845,7 @@ STAGE PLANS:
                         input vertices:
                           1 Map 3
                         Position of Big Table: 0
-                        Statistics: Num rows: 59 Data size: 6525 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 57 Data size: 16155 Basic stats: 
COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -968,22 +968,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 4 Data size: 484 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 4 Data size: 484 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 4 Data size: 1188 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 1
                         auto parallelism: true
             Execution mode: llap

http://git-wip-us.apache.org/repos/asf/hive/blob/8f7c5788/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_8.q.out
----------------------------------------------------------------------
diff --git 
a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_8.q.out 
b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_8.q.out
index 7fc90fd..0e04284 100644
--- a/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_8.q.out
+++ b/ql/src/test/results/clientpositive/llap/auto_sortmerge_join_8.q.out
@@ -135,22 +135,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 2 Data size: 244 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 2 Data size: 596 Basic stats: COMPLETE 
Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 0
                         auto parallelism: true
             Execution mode: llap
@@ -263,16 +263,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 116 Data size: 32232 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -283,7 +283,7 @@ STAGE PLANS:
                         input vertices:
                           0 Map 1
                         Position of Big Table: 1
-                        Statistics: Num rows: 127 Data size: 13807 Basic 
stats: COMPLETE Column stats: NONE
+                        Statistics: Num rows: 122 Data size: 33926 Basic 
stats: COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -480,16 +480,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 116 Data size: 32232 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -500,7 +500,7 @@ STAGE PLANS:
                         input vertices:
                           1 Map 3
                         Position of Big Table: 0
-                        Statistics: Num rows: 127 Data size: 13807 Basic 
stats: COMPLETE Column stats: NONE
+                        Statistics: Num rows: 122 Data size: 33926 Basic 
stats: COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -623,22 +623,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 2 Data size: 244 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 2 Data size: 596 Basic stats: COMPLETE 
Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 1
                         auto parallelism: true
             Execution mode: llap
@@ -825,16 +825,16 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: a
-                  Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                  Statistics: Num rows: 116 Data size: 32232 Basic stats: 
COMPLETE Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 116 Data size: 12552 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 111 Data size: 30842 Basic stats: 
COMPLETE Column stats: NONE
                       Map Join Operator
                         condition map:
                              Inner Join 0 to 1
@@ -845,7 +845,7 @@ STAGE PLANS:
                         input vertices:
                           1 Map 3
                         Position of Big Table: 0
-                        Statistics: Num rows: 127 Data size: 13807 Basic 
stats: COMPLETE Column stats: NONE
+                        Statistics: Num rows: 122 Data size: 33926 Basic 
stats: COMPLETE Column stats: NONE
                         Group By Operator
                           aggregations: count()
                           mode: hash
@@ -968,22 +968,22 @@ STAGE PLANS:
             Map Operator Tree:
                 TableScan
                   alias: b
-                  Statistics: Num rows: 2 Data size: 244 Basic stats: COMPLETE 
Column stats: NONE
+                  Statistics: Num rows: 2 Data size: 596 Basic stats: COMPLETE 
Column stats: NONE
                   GatherStats: false
                   Filter Operator
                     isSamplingPred: false
                     predicate: key is not null (type: boolean)
-                    Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                    Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                     Select Operator
                       expressions: key (type: string)
                       outputColumnNames: _col0
-                      Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                      Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                       Reduce Output Operator
                         key expressions: _col0 (type: string)
                         null sort order: a
                         sort order: +
                         Map-reduce partition columns: _col0 (type: string)
-                        Statistics: Num rows: 2 Data size: 244 Basic stats: 
COMPLETE Column stats: NONE
+                        Statistics: Num rows: 2 Data size: 596 Basic stats: 
COMPLETE Column stats: NONE
                         tag: 1
                         auto parallelism: true
             Execution mode: llap

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