Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/7557#issuecomment-123408581
I don't think this is correct:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L147
```scala
scala> sql("SELECT a FROM test GROUP BY b")
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() if you don't care which value you get.;
scala> sql("SELECT first(a) FROM test GROUP BY b")
res3: org.apache.spark.sql.DataFrame = [_c0: int]
```
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