[CALCITE-7434] Error in new decorrelation algorithm caused by FilterJoinRule omitting variablesSet#4824
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silundong merged 1 commit intoapache:mainfrom Mar 7, 2026
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xiedeyantu
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Mar 6, 2026
| !plan | ||
| !} | ||
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| SELECT E.EMPNO |
xiedeyantu
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…oinRule omitting variablesSet
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The root cause is that
FilterJoinRulewas applied before the subquery was removed, and when building the top Filter, the variablesSet was omitted.SubQueryRemoveRule.FILTER_SUB_QUERY_TO_MARK_CORRELATEperforms a strict check on variablesSet when removing a subquery: if it is empty, aJoinwill be generated instead of aCorrelate. As a result, the plan does not contain aCorrelate, but correlated variables remain.