Claude Brisson created CALCITE-7083:
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Summary: RelMdDistinctRowCount aggregates implementation problems
Key: CALCITE-7083
URL: https://issues.apache.org/jira/browse/CALCITE-7083
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.40.0
Reporter: Claude Brisson
The default implementation of getDistinctRowCount for aggregates has several
problems:
- when determining the pushable predicates, it makes the assumption that the
aggregate group key is a zero-based range, which is not necessarily the case
(the indices in the aggregate group key are the child indices, the predicates
are expressed in terms of the zero-based output range)
- if there is any aggregated column in the queried group key, then it makes no
sense to query the distinct values on the aggregate input, the handler should
return null or (at most) the full cardinal of the aggregate
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