planner: let CopTiFlashConcurrencyFactor inflence the cost of whole plan #24157
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verbose conflicts with brief, you cannot set them at the same time.
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/LGTM |
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/merge |
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/lgtm |
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/merge |
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This pull request has been accepted and is ready to merge. Commit hash: 429f12b
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry pick to release-5.0 in PR #24488 |
What problem does this PR solve?
Problem Summary:
Sometimes optimizer doesn't choose mpp plan. We lack a way to suggest optimizer choose mpp. I think tiflash_concurrency_factor is a good variable to charge this.
What is changed and how it works?
What's Changed:
The final mpp plan's cost will devide this factor.
How it Works:
Related changes
Check List
Tests
Release note