beliefer commented on issue #27495: [SPARK-28880][SQL] Support ANSI nested bracketed comments URL: https://github.com/apache/spark/pull/27495#issuecomment-589575677 @cloud-fan `'/*' (BRACKETED_COMMENT|.)*? '*/' {isHint()}? -> channel(HIDDEN)` exists a issue that antlr matches bracketed comments or hint first and then call method `isHint`, so the matches will throw parse exception first.
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