Steve Carlin created IMPALA-14456:
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Summary: Calcite planner: Need a better estimate for deciding if a
runtime filter is needed
Key: IMPALA-14456
URL: https://issues.apache.org/jira/browse/IMPALA-14456
Project: IMPALA
Issue Type: Sub-task
Reporter: Steve Carlin
There is some code in ImpalaLoptOptimizeJoinRule which decides if a runtime
filter should cause the left side and a right side of a join to be swapped. It
compares row counts from the deepest left side versus the row count on the
right side.
This isn't a good comparison because we really want to associate a cost with
the right side.
There was some initial simplistic code that also multipled the row counts with
the average row size, but that was incorrect because only projected columns
come out of the deepest left side, not the whole row.
This should be re-examined.
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