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cloud: fix control add 56318 #19694

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Dec 16, 2024
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cloud: fix control add 56318 #19694

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EricZequan Dec 13, 2024
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EricZequan Dec 13, 2024
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EricZequan Dec 16, 2024
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EricZequan Dec 16, 2024
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10 changes: 10 additions & 0 deletions optimizer-fix-controls.md
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Expand Up @@ -76,3 +76,13 @@ SET SESSION tidb_opt_fix_control = '44262:ON,44389:ON';
- Default value: `OFF`
- Possible values: `ON`, `OFF`
- This variable controls whether the optimizer explores enforced plans during query optimization after finding an unenforced plan.

### [`56318`](https://github.com/pingcap/tidb/issues/56318)

> **Note:**
>
> This is only available for [TiDB Cloud Serverless](https://docs.pingcap.com/tidbcloud/select-cluster-tier#tidb-cloud-serverless).

- Default value: `ON`
- Possible values: `ON`, `OFF`
- This variable controls whether to avoid calculating the heavy expression used in the `ORDER BY` statement twice.
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