> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# move_* 会话设置

> ClickHouse 中 move_* 生成组下的会话设置。

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>类型</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>默认值</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          无需重启即可更改
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

这些设置可在 [system.settings](/docs/zh/reference/system-tables/settings) 中查看，且由 [源代码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="move_all_conditions_to_prewhere">
  ## move\_all\_conditions\_to\_prewhere
</div>

<SettingsInfoBlock type="Bool" default_value="1" />

将 WHERE 中所有适合的条件移至 PREWHERE

<div id="move_primary_key_columns_to_end_of_prewhere">
  ## move\_primary\_key\_columns\_to\_end\_of\_prewhere
</div>

<SettingsInfoBlock type="Bool" default_value="1" />

将包含主键列的 PREWHERE 条件移到 AND 事件链的末尾。这些条件很可能已在主键分析阶段被考虑在内，因此对 PREWHERE 筛选的作用不大。