Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3026#discussion_r97313779
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
---
@@ -375,15 +393,26 @@ object ExpressionParser extends JavaTokenParsers with
PackratParsers {
lazy val prefixFlattening: PackratParser[Expression] =
FLATTEN ~ "(" ~> composite <~ ")" ^^ { e => Flattening(e) }
+ lazy val prefixGrouping: PackratParser[Expression] =
--- End diff --
If you add `grouping`, `groupingId` and `groupId` to the
`FunctionCatalog.builtInFunctions`. We don't need the following lines.
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