feat: early group emission with emit+reset for partial aggregation#21595

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Dandandan:early-group-emission

Commits on Apr 13, 2026

feat: two-generation early emission for partial aggregation

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refactor: improve early emission with ratio gating, memory tracking, and dedup

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fix: only emit early after skip probe evaluates and decides not to skip

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refactor: replace two-generation scheme with bounded hash table overflow

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fix: disable overflow passthrough for distinct aggregates

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fix: use emit+reset strategy for distinct aggregates

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Commits on Apr 14, 2026