Dandandan opened a new pull request, #20940:
URL: https://github.com/apache/datafusion/pull/20940
…ggregates
Rewrites queries with multiple DISTINCT aggregates on different columns
(e.g. SELECT COUNT(DISTINCT a), COUNT(DISTINCT b) FROM t) into a UNION ALL of
individual aggregates with an outer MAX to combine results. This enables
parallel execution of each distinct aggregate via InterleaveExec, and each
branch also benefits from SingleDistinctToGroupBy optimization.
Also adds function_registry support to OptimizerContext and removes the
redundant clickbench_extended.slt (already covered by clickbench.slt).
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