feat: reorder row groups by grouping key statistics#21588

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Dandandan wants to merge 9 commits intoapache:mainfrom

Dandandan:reorder-by-groupby-keys

Commits on Apr 13, 2026

feat: reorder row groups by statistics during sort pushdown
zhuqi-lucas
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test: add SLT tests for row group reorder by statistics
zhuqi-lucas
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test: add EXPLAIN assertions for row group reorder tests
zhuqi-lucas
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feat: reorder row groups by grouping key statistics

Dandandan
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claude
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feat: reorder row groups by grouping key statistics

Dandandan
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claude
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fix: propagate groupby order through transparent nodes and use all keys

Dandandan
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claude
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fix: add FilterExec as transparent node for groupby order pushdown

Dandandan
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claude
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feat: early emission for partial aggregation based on group count threshold

Dandandan
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claude
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fix: increase early emission threshold default to 100000

Dandandan
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claude
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