cloud-fan commented on code in PR #48047:
URL: https://github.com/apache/spark/pull/48047#discussion_r1757294893
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sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -604,6 +604,7 @@ queryTerm
operator=INTERSECT setQuantifier? right=queryTerm
#setOperation
| left=queryTerm {!legacy_setops_precedence_enabled}?
operator=(UNION | EXCEPT | SETMINUS) setQuantifier? right=queryTerm
#setOperation
+ | left=queryTerm OPERATOR_PIPE operatorPipeRightSide
#operatorPipeStatement
Review Comment:
I'm not familiar with ANTLR enough. So this recursive parser rule matches
the SQL string from the end? e.g. it finds the first `operatorPipeRightSide`
from the end, and then tries to match a chain of pipe operators.
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