Update the related variable description for CREATE INDEX (#6588)#6608
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| 表达式索引的语法和限制与 MySQL 相同，是通过将索引建立在隐藏的虚拟生成列 (generated virtual column) 上来实现的。因此所支持的表达式继承了虚拟生成列的所有[限制](/generated-columns.md#生成列的局限性)。目前，建立了索引的表达式只有在 `FIELD` 子句、`WHERE` 子句和 `ORDER BY` 子句中时，优化器才能使用表达式索引。后续将支持 `GROUP BY` 子句。 | ||
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This is an automated cherry-pick of #6588
What is changed, added or deleted? (Required)
Update the related variable description for CREATE INDEX because the scope of tidb_ddl_reorg_priority is SESSION instead of GLOBAL.
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What is the related PR or file link(s)?
Do your changes match any of the following descriptions?