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https://issues.apache.org/jira/browse/SPARK-9210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636115#comment-14636115
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Simeon Simeonov commented on SPARK-9210:
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Standalone test demonstrating the problem & spark-shell output:
https://gist.github.com/ssimeonov/72c8a9b01f99e35ba470
> checkValidAggregateExpression() throws exceptions with bad error messages
> -------------------------------------------------------------------------
>
> Key: SPARK-9210
> URL: https://issues.apache.org/jira/browse/SPARK-9210
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.1
> Environment: N/A
> Reporter: Simeon Simeonov
> Priority: Trivial
>
> When a result column in {{SELECT ... GROUP BY}} is neither one of the {{GROUP
> BY}} expressions nor uses an aggregation function,
> {{org.apache.spark.sql.catalyst.analysis.CheckAnalysis}} throws
> {{org.apache.spark.sql.AnalysisException}} with the message "expression
> '_column expression_' is neither present in the group by, nor is it an
> aggregate function. Add to group by or wrap in first() if you don't care
> which value you get."
> The remedy suggestion in the exception message incorrect: the function name
> is {{first_value}}, not {{first}}.
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