zzwqqq created CALCITE-7585:
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Summary: MERGE may unparse EXISTS predicates in ON clause without
parentheses
Key: CALCITE-7585
URL: https://issues.apache.org/jira/browse/CALCITE-7585
Project: Calcite
Issue Type: Bug
Reporter: zzwqqq
Assignee: zzwqqq
https://github.com/apache/calcite/pull/4969 fixes unparsing of EXISTS
subqueries in UPDATE and DELETE statements.
During review, it was pointed out that MERGE may have a similar problem because
EXISTS predicates can appear in the ON clause.
This has not been fully confirmed yet. This issue is opened to track the
potential MERGE case separately. If confirmed, MERGE should use the same
parenthesized unparsing behavior and include regression tests.
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