Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3026#discussion_r97314389
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
---
@@ -176,6 +179,12 @@ object ExpressionParser extends JavaTokenParsers with
PackratParsers {
lazy val atom: PackratParser[Expression] =
( "(" ~> expression <~ ")" ) | literalExpr | fieldReference
+ lazy val grouped: PackratParser[Expression] =
+ "(" ~> expressionList <~ ")" ^^ { l => new GroupedExpression(l.toSeq) }
+
+ lazy val unit: PackratParser[Expression] =
--- End diff --
Use a different name for this. My IDE shows warnings.
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