Silun Dong created CALCITE-7434:
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Summary: Error in new decorrelation algorithm caused by
FilterJoinRule omitting variablesSet
Key: CALCITE-7434
URL: https://issues.apache.org/jira/browse/CALCITE-7434
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.41.0
Reporter: Silun Dong
Assignee: Silun Dong
The following SQL will throw an error when run in CoreQuidemTest2:
{code:java}
SELECT E.EMPNO
FROM EMP E
JOIN DEPT D ON E.DEPTNO = D.DEPTNO
WHERE E.EMPNO > 10 AND D.DEPTNO = (
SELECT MIN(D_INNER.DEPTNO)
FROM DEPT D_INNER
WHERE D_INNER.DEPTNO = E.DEPTNO);
java.lang.AssertionError: Correlation variable $cor0 should be defined at
org.apache.calcite.adapter.enumerable.EnumerableRelImplementor.getCorrelVariableGetter(EnumerableRelImplementor.java:476){code}
The root cause is that {{FilterJoinRule}} was applied before the subquery was
removed, and when [building the top
Filter|https://github.com/apache/calcite/blob/7654dd82162508231cb3ed44e60fed356e931403/core/src/main/java/org/apache/calcite/rel/rules/FilterJoinRule.java#L251],
the {{variablesSet}} was omitted.
{{SubQueryRemoveRule.FILTER_SUB_QUERY_TO_MARK_CORRELATE}} performs a strict
check on {{variablesSet}} when removing a subquery: if it is empty, a {{Join}}
will be generated instead of a {{{}Correlate{}}}. As a result, the plan does
not contain a {{{}Correlate{}}}, but correlated variables remain.
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