a34729t opened a new issue, #19279:
URL: https://github.com/apache/pinot/issues/19279
The value-based segment pruners (`ColumnValueSegmentPruner` and
`BloomFilterSegmentPruner`) skip segment pruning for `IN (...)` predicates when
the clause contains more than `inpredicate.threshold` values. The default is
10 (`Server.DEFAULT_VALUE_PRUNER_IN_PREDICATE_THRESHOLD`).
For queries with large IN lists the current behavior is that pruners are
bypassed entirely and every segment is scanned, which is slow and in large
Pinot cluster, reduces overall capacity for other queries. The only way to
raise the threshold today is the per-server config
`pinot.server.query.executor.pruner.<pruner>.inpredicate.threshold`, which
requires restarting the servers, which can take a while.
I propose adding a boolean query option like so:
```
SET forceInPredicatePruning=true;
```
When true, the value pruners always attempt to prune segments for `IN`
predicates regardless of the clause size. Default is false, preserving existing
behavior.
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