Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11677#issuecomment-195718320
Also verified locally in Spark shell.
Before:
```
scala> sqlContext range 10 select ('id as 'a, 'id as 'b) groupBy 'b agg 'a
org.apache.spark.sql.AnalysisException: expression '`a`' is neither present
in the group by, nor is it an aggregate function. Add to group by or wrap in
first() (or first_value) if you don't care which value you get.;
at
org.apache.spark.sql.execution.QueryExecution.assertAnalyzed(QueryExecution.scala:36)
at org.apache.spark.sql.Dataset$.newDataFrame(DataFrame.scala:58)
at org.apache.spark.sql.GroupedData.toDF(GroupedData.scala:58)
at org.apache.spark.sql.GroupedData.agg(GroupedData.scala:214)
... 49 elided
```
After:
```
scala> sqlContext range 10 select ('id as 'a, 'id as 'b) groupBy 'b agg 'a
org.apache.spark.sql.AnalysisException: expression '`a`' is neither present
in the group by, nor is it an aggregate function. Add to group by or wrap in
first() (or first_value) if you don't care which value you get.;
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$class.failAnalysis(CheckAnalysis.scala:38)
at
org.apache.spark.sql.catalyst.analysis.Analyzer.failAnalysis(Analyzer.scala:50)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1.org$apache$spark$sql$catalyst$analysis$CheckAnalysis$class$$anonfun$$checkValidAggregateExpression$1(CheckAnalysis.scala:152)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$4.apply(CheckAnalysis.scala:180)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$4.apply(CheckAnalysis.scala:180)
at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1.apply(CheckAnalysis.scala:180)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1.apply(CheckAnalysis.scala:50)
at
org.apache.spark.sql.catalyst.trees.TreeNode.foreachUp(TreeNode.scala:119)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$class.checkAnalysis(CheckAnalysis.scala:50)
at
org.apache.spark.sql.catalyst.analysis.Analyzer.checkAnalysis(Analyzer.scala:50)
at
org.apache.spark.sql.execution.QueryExecution.assertAnalyzed(QueryExecution.scala:34)
at org.apache.spark.sql.Dataset$.newDataFrame(DataFrame.scala:58)
at org.apache.spark.sql.GroupedData.toDF(GroupedData.scala:58)
at org.apache.spark.sql.GroupedData.agg(GroupedData.scala:214)
... 49 elided
```
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