Aitozi created CALCITE-5784:
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Summary: Generate the same correlationId for the same query
Key: CALCITE-5784
URL: https://issues.apache.org/jira/browse/CALCITE-5784
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Aitozi
Currently, the CTE query block will be sql2rel multiple times if be referenced
multiple times. If it contains a lateral join, it will generate different
correlation id. See below:
{code:java}
String sql = "WITH a AS (SELECT ename, job, empno, r FROM emp, LATERAL
TABLE (ramp(empno)) as T(r))"
+ " SELECT * from a a1, a a2 WHERE a1.r = a2.empno";
sql(sql).ok();
{code}
{code:java}
LogicalProject(ENAME=[$0], JOB=[$1], EMPNO=[$2], R=[$3], ENAME0=[$4],
JOB0=[$5], EMPNO0=[$6], R0=[$7])
LogicalJoin(condition=[=($3, $6)], joinType=[inner])
LogicalProject(ENAME=[$1], JOB=[$2], EMPNO=[$0], R=[$9])
LogicalCorrelate(correlation=[$cor0], joinType=[inner],
requiredColumns=[{0}])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalTableFunctionScan(invocation=[RAMP($cor0.EMPNO)],
rowType=[RecordType(INTEGER I)])
LogicalProject(ENAME=[$1], JOB=[$2], EMPNO=[$0], R=[$9])
LogicalCorrelate(correlation=[$cor1], joinType=[inner],
requiredColumns=[{0}])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalTableFunctionScan(invocation=[RAMP($cor1.EMPNO)],
rowType=[RecordType(INTEGER I)])
{code}
It will generate two correlation id. In flink there is a subplan reuse based on
the digest, it will break this functionality
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