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https://issues.apache.org/jira/browse/TAJO-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499577#comment-14499577
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ASF GitHub Bot commented on TAJO-923:
-------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/458#discussion_r28582879
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/function/builtin/VarPop.java ---
@@ -0,0 +1,42 @@
+/**
+ * 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.
+ */
+
+package org.apache.tajo.engine.function.builtin;
+
+import org.apache.tajo.catalog.Column;
+import org.apache.tajo.datum.Datum;
+import org.apache.tajo.datum.DatumFactory;
+import org.apache.tajo.datum.NullDatum;
+import org.apache.tajo.plan.function.FunctionContext;
+
+public abstract class VarPop extends StdDev {
--- End diff --
I think that we need to change ```StdDev``` to more general name.
How about ```Variance```? Or, do you have any good idea?
> Add VAR_SAMP and VAR_POP window functions
> -----------------------------------------
>
> Key: TAJO-923
> URL: https://issues.apache.org/jira/browse/TAJO-923
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Assignee: Dongjoon Hyun
> Fix For: window function
>
> Attachments: TAJO-923.Hyun.150416.0.patch.txt, TAJO-923.patch
>
>
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