Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7819#discussion_r35950762
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -116,11 +119,14 @@ trait CheckAnalysis {
case BinaryType =>
failAnalysis(s"grouping expression '${expr.prettyString}'
in aggregate can " +
s"not be binary type.")
+ case m: MapType =>
+ failAnalysis(s"grouping expression '${expr.prettyString}'
in aggregate can " +
--- End diff --
"map type expression ${e.prettyString} cannot be used in grouping
expression"
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