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feat: carry completed join filters across Union inputs - #6437

Draft

sunchao wants to merge 7 commits into

apache:mainfrom

sunchao:codex/oss-union-runtime-filters

Commits on Oct 5, 2026
- perf: reuse prepared broadcast builds across executor tasks
  sunchao
  committed
  9e77f9f
- Simplify broadcast build reuse and consolidate coverage
  sunchao
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  7a37da2
- Keep lazy broadcast execution on the Spark task thread
  sunchao
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  ddd4ccd
- Clear strict Scala warnings in broadcast input and tests
  sunchao
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  19f59d9
- build: pin Arrow 59 prepared-build companion for draft validation
  sunchao
  committed
  2b94d42
- perf: carry completed join filters into lazy Union branches
  sunchao
  committed
  adb9d08
- Clear strict Scala warnings in lazy Union input
  sunchao
  committed
  234ebbb