feat: Add pluggable StatisticsRegistry for operator-level statistics propagation#21483

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asolimando wants to merge 8 commits intoapache:mainfrom

asolimando:asolimando/statistics-planner-prototype

Commits on Apr 8, 2026

Add operator_statistics framework for pluggable statistics propagation
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Add built-in operator statistics providers
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Add ClosureStatisticsProvider for test injection and cardinality feedback
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Add use_statistics_registry config and registry-aware join selection
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style: fix cargo fmt in operator_statistics/mod.rs
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style: fix broken rustdoc link to RelationPlanner in operator_statistics
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fix: move use_statistics_registry to correct alphabetical position in information_schema.slt
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fix: relax aggregate delegation test assertions for force_hash_collisions compatibility
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