Thomas Tauber-Marshall created IMPALA-6145:
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Summary: Assign runtime filter ids lazily
Key: IMPALA-6145
URL: https://issues.apache.org/jira/browse/IMPALA-6145
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Affects Versions: Impala 2.11.0
Reporter: Thomas Tauber-Marshall
Priority: Minor
Currently, when generating runtime filters we iterate over the plan tree,
create a filter for each equi join predicate of each hash join node, and assign
them ascending ids.
Not all of the created filters always end up assigned to a target scan node,
and those that aren't assigned are left out of the plan, resulting in gaps in
the sequence of filter ids in the explain output, which could be confusing to
users.
It would be better to assign filter ids only to filters that end up in the
final plan, so that the max filter id in the plan is equal to the total number
of filters in the plan.
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