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…ation Expose upstream DataFusion aggregate functions that were not yet available in the Python API. Closes apache#1454. - grouping: returns grouping set membership indicator (rewritten by the ResolveGroupingFunction analyzer rule before physical planning) - percentile_cont: computes exact percentile using continuous interpolation (unlike approx_percentile_cont which uses t-digest) - var_population: alias for var_pop Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Which issue does this PR close?
Closes #861
Closes #925
Closes #1454
Rationale for this change
These functions exist upstream but were not exposed to the Python API
What changes are included in this PR?
Expose functions to Python API
Add unit tests
Are there any user-facing changes?
New addition only.