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[VL] improve Sort Merge Join on Velox backend #5720

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zhouyuan opened this issue May 13, 2024 · 1 comment
Open

[VL] improve Sort Merge Join on Velox backend #5720

zhouyuan opened this issue May 13, 2024 · 1 comment
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enhancement New feature or request

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@zhouyuan
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Description

By default gluten with Velox backend will use Shuffled Hash Join to get better performance. Sort Merge Join is still useful in some cases 1) very big table on build side 2) bucket scan 3) inner join with redundant keys
the plan is to

  • Adding support for SMJ join types other than inner and left join, and join with conditions
  • improve the performance of SMJ/Sort

thanks,
-yuan

@zhouyuan zhouyuan added the enhancement New feature or request label May 13, 2024
@FelixYBW
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should we remove the prefer_hashjoin or create some more rules using RAS?

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