Add DecomposeAggregate optimizer to rewrite AVG as SUM/COUNT#21613

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Dandandan:decompose-avg-optimization

Commits on Apr 14, 2026

Add DecomposeAggregate optimizer rule to rewrite AVG as SUM/COUNT

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Skip GroupingSet aggregates in DecomposeAggregate rule

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Update preserve_file_partitioning test for DecomposeAggregate

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Fix pgjson explain test to match actual key ordering

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Strip AVG's CAST to Float64 and let SUM use native integer types

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Fix pgjson explain test to match actual key ordering

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Simplify DecomposeAggregate CAST handling: let SUM do its own coercion

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Simplify DecomposeAggregate: pass AVG args directly to SUM

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Strip CAST to Float64 only for types SUM handles natively

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