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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