planner: don't decorrelate the APPLY when the inner's projection reference no column (#32370) #32571
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cherry-pick #32370 to release-4.0
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# In tidb repo: git pr https://github.com/pingcap/tidb/pull/32571
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…rences no column
What problem does this PR solve?
Issue Number: close #32089
Problem Summary:
When APPLY is left outer join and the inner child is projection without any reference to its child. We cannot decorrelate such APPLY for now. Since the evaluation of the constant expression would be different before and after the decorrelation.
Check List
Tests
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Release note