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system-variables.md

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@@ -3890,14 +3890,6 @@ mysql> desc select count(distinct a) from test.t;
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- 开启后可能导致执行计划变化。如果你在开启后遇到性能回退或计划不稳定,建议关闭该变量。
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- 对于包含非确定性或可能产生副作用的过滤条件(例如 `rand()` 等),即使开启该变量也可能不会生效,以避免改变表达式的求值行为。
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开启示例:
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{{< copyable "sql" >}}
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```sql
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SET SESSION tidb_opt_join_reorder_through_sel = ON;
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```
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### `tidb_opt_limit_push_down_threshold`
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- 作用域:SESSION | GLOBAL

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