cloud-fan commented on code in PR #43663:
URL: https://github.com/apache/spark/pull/43663#discussion_r1389454928
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sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -988,6 +988,8 @@ primaryExpression
| name=(PERCENTILE_CONT | PERCENTILE_DISC) LEFT_PAREN
percentage=valueExpression RIGHT_PAREN
WITHIN GROUP LEFT_PAREN ORDER BY sortItem RIGHT_PAREN
(FILTER LEFT_PAREN WHERE where=booleanExpression RIGHT_PAREN)? ( OVER
windowSpec)? #percentile
+ | MODE LEFT_PAREN RIGHT_PAREN WITHIN GROUP LEFT_PAREN ORDER BY sortItem
RIGHT_PAREN
Review Comment:
is `mode` the only function that supports WITH GROUP? It looks messy to add
one parser rule for each function to add WITH GROUP support.
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