master: optimizer: update default value of fix control 52869#21743
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Update optimizer-fix-controls.md and explain-index-merge.md to describe the ON/OFF behavior of 52869 and the v8.5.7 default value change, replacing the previous 'limitation exists by default' wording. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Grace Cai <qqzczy@126.com>
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What is changed, added or deleted? (Required)
Update the default value description of optimizer fix control
52869to clarify that it isONstarting from TiDB v8.5.7.Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
IndexMergewhen an alternative index exists tidb#63701Do your changes match any of the following descriptions?