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Projection pushdown to tikv feature GA #51876

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yibin87 opened this issue Mar 19, 2024 · 1 comment
Open
10 of 11 tasks

Projection pushdown to tikv feature GA #51876

yibin87 opened this issue Mar 19, 2024 · 1 comment
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type/enhancement The issue or PR belongs to an enhancement.

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@yibin87
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yibin87 commented Mar 19, 2024

Enhancement

tidb_opt_projection_push_down is introduced by #27029 , and is set 'off' by default, still not GA now.
It aimed to improve performance in two sides:

  1. Utilize distributed tikv nodes to perform calculations parallelly
  2. Provide an elegantly way to reduce unused columns which are transformed back to tidb from tikv Is it possibe to support Projection push down on IndexLookUp? #44902

However, there are still some basic functionality issues when this feature is set 'on':

Also exposed some existing function behavior inconsistency issues:

And after these functionality issues are fixed, we need to consider the performance impact

Others:

@yibin87 yibin87 added the type/enhancement The issue or PR belongs to an enhancement. label Mar 19, 2024
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yibin87 commented Mar 19, 2024

/assign @yibin87

@yibin87 yibin87 changed the title Projection pushdown to tikv feature GA Turn on projection pushdown to tikv feature by default Mar 28, 2024
@yibin87 yibin87 changed the title Turn on projection pushdown to tikv feature by default Projection pushdown to tikv feature GA Mar 29, 2024
ti-chi-bot bot pushed a commit that referenced this issue Jul 25, 2024
…own to false when tidb upgrades from versions older than 8.3.0 to 8.3.0 and later (#54861)

ref #51876
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