optimizer-fix-controls: Add optimizer fix control 47400 for controlling zero estRows

[terry1purcell]

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What is changed, added or deleted? (Required)

Added optimizer fix control 47400.

This variable sets the minimum row estimate that the optimizer will allow. Due to challenges that all optimizers face in accuracy in estimating the number of qualified rows for each plan step in a query plan, it is common that an optimizer will set a lower limit. The default implemented in TiDB is consistent with other databases, and this variable allows a customer to enable the prior behavior.

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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): Planner: Do not allow cardinality to go below 1 | tidb-test=pr/2376 tidb#55242

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• Delete files
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• Might cause conflicts after applied to another branch

[Rustin170506]

Thanks!

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[Rustin170506]

Looks good to me. Thanks! 👍

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@Rustin170506: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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Looks good to me. Thanks! 👍

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[qiancai]

Rest LGTM

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[LGTM Timeline notifier]

Timeline:

• 2024-09-11 08:37:17.371812231 +0000 UTC m=+431907.112236171: ☑️ agreed by qiancai.
• 2024-09-25 08:33:22.880428062 +0000 UTC m=+1641272.620851986: ☑️ agreed by Oreoxmt.