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[Enhancement] Restrict mem size of one chunk #28287

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trueeyu
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@trueeyu trueeyu commented Jul 31, 2023

Fixes #issue

In the current exchange framework, a Chunk will be cached until 4096 lines before being sent. The actual memory size used is: number of BEs * Dop. For the large data type such as Bitmap, 1 row will be relatively large and will take up a lot of memory.

What type of PR is this:

  • BugFix
  • Feature
  • Enhancement
  • Refactor
  • UT
  • Doc
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Checklist:

  • I have added test cases for my bug fix or my new feature
  • This pr will affect users' behaviors
  • This pr needs user documentation (for new or modified features or behaviors)
    • I have added documentation for my new feature or new function

Bugfix cherry-pick branch check:

  • I have checked the version labels which the pr will be auto-backported to the target branch
    • 3.1
    • 3.0
    • 2.5
    • 2.4

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[FE PR Coverage Check]

😍 pass : 0 / 0 (0%)

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LGTM

@trueeyu trueeyu closed this Sep 18, 2024
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