feat: aggregate annotations (annotate / having / order_by)#1742

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collerek wants to merge 16 commits into

feat/aggregation-annotations

Commits on Jul 14, 2026

feat: add aggregate expression value objects (Count/Sum/Avg/Min/Max)
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feat: annotate() with pre-grouped derived-table aggregate join
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fix: guard Count(distinct) for column-less counts and drop unused helpers
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feat: order_by an annotated aggregate (closes #566)
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fix: dialect-aware quoting for order_by on annotation labels
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feat: having() filtering on annotated aggregates
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test: sum/avg/min/max annotations and null-for-empty semantics
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feat: Count() over many-to-many relations
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fix: reject qualified aggregates over many-to-many relations
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feat: annotations compose with select_related and pagination
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test: discriminating assertions for annotation ordering under pagination; dedup dialect quoting
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test: annotation count independent of outer relation filter
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