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add doc for tidb_opt_index_join_max_scan_rows_ratio #21629

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add doc for tidb_opt_index_join_max_scan_rows_ratio #21629

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10 changes: 10 additions & 0 deletions system-variables.md
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Expand Up @@ -3734,6 +3734,16 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）
- 默认值：`1.5`
- 表示 TiDB 往临时磁盘读写一个字节数据的 I/O 开销。该变量是[代价模型](/cost-model.md)内部使用的变量，**不建议**修改该变量的值。

### `tidb_opt_index_join_max_scan_rows_ratio`

- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：是
- 类型：浮点数
- 范围：`[0, 18446744073709551615]`
- 默认值：`0`
- 表示当 IndexJoin 所要处理的总行数是 HashJoin 要处理的总行数的比例大于该变量时，直接强制放弃 IndexJoin

### `tidb_opt_distinct_agg_push_down`

- 作用域：SESSION
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