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[refactor](be) Add AggKeyBlockIterator in BlockReader - #70462

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csun5285 wants to merge 12 commits into

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csun5285:agg-heap-fold

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[refactor](be) Add AggKeyBlockIterator in BlockReader#70462
csun5285 wants to merge 12 commits into
apache:masterfrom
csun5285:agg-heap-fold

Commits on Nov 11, 2026
- [refactor](storage) Fold AGG_KEYS reads over Blocks merged by one heap
  
  csun5285
  and
  claude
  committed
  1bfcdc4
- [test](regression) Add a regression test for AGG_KEYS reads of overlapping segments
  
  csun5285
  and
  claude
  committed
  80eea9d
- [refactor](storage) Shape the AGG_KEYS heap merge and fold like StarRocks' iterators
  
  csun5285
  and
  claude
  committed
  d2e0469
- [refactor](storage) Merge the rows of an AGG_KEYS key in write order within one Block
  
  csun5285
  and
  claude
  committed
  3b3fb60
Commits on Nov 12, 2026
- [refactor](storage) Simplify the AGG_KEYS heap merge, fold and BlockReader setup
  
  csun5285
  and
  claude
  committed
  83af702
Commits on Nov 13, 2026