[jira] [Created] (CALCITE-5466) Constant condition can't be reduced after correlate

["Aitozi (Jira)" <ji...@apache.org>]

Aitozi created CALCITE-5466:
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             Summary: Constant condition can't be reduced after correlate
                 Key: CALCITE-5466
                 URL: https://issues.apache.org/jira/browse/CALCITE-5466
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Aitozi
            Assignee: Aitozi


Currently the RelMdPredicates do not handle the predicates for the correlate node which will generate the below output 

{noformat}
Sink(table=[default_catalog.default_database.sink_t], fields=[name, num])
+- Calc(select=[name, CAST(CASE(=(__source_type__, _UTF-16LE'bounded'), 1, 2) AS BIGINT) AS num])
   +- Correlate(invocation=[test_udtf($cor1.name)], correlate=[table(test_udtf($cor1.name))], select=[name,__source_type__,EXPR$0], rowType=[RecordType(VARCHAR(2147483647) name, CHAR(7) __source_type__, VARCHAR(2147483647) EXPR$0)], joinType=[INNER])
      +- Calc(select=[name, _UTF-16LE'bounded' AS __source_type__])
         +- TableSourceScan(table=[[default_catalog, default_database, source_t]], fields=[name])
{noformat}

However, the '__source_type__' is obviously a constant can be reduced during optimizing. It can be solved by extend the RelMdPredicates to get predicates from the left input of the correlate node




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