Refactor PushDownFilter benchmark suite: add fast default mode, validation, and unified A/B harness#21029

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kosiew wants to merge 10 commits intoapache:mainfrom

kosiew:push-down-05-20002

Commits on Apr 1, 2026

Refactor push down filter benchmarks to use dynamic sweep points
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Add dynamic sample size configuration for push down filter benchmarks
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Remove unused sample size function and constant from push down filter benchmarks
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feat(benchmarks): refactor push down filter benchmarks for improved organization
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fix(benchmarks): remove duplicate function `build_case_heavy_left_join_df_with_push_down_filter`
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feat(benches): enhance case-heavy left join benchmarks with inference checks
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refactor: streamline benchmarks for push down filter with improved query handling
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fix: simplify predicate extraction in SQL planner
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feat(benchmarks): enhance left join benchmark with push down filter tests
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cargo fmt
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