> ## 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.

# min_count_* 会话设置

> ClickHouse 中 min_count_* 自动生成分组的会话设置。

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，并由 [源代码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="min_count_to_compile_aggregate_expression">
  ## min\_count\_to\_compile\_aggregate\_expression
</div>

<SettingsInfoBlock type="UInt64" default_value="3" />

触发 JIT 编译所需的相同聚合表达式的最小数量。仅在启用 [compile\_aggregate\_expressions](/docs/zh/reference/settings/session-settings/compile#compile_aggregate_expressions) 设置时生效。

可能的值：

* 正整数。
* 0 — 相同的聚合表达式始终会被 JIT 编译。

<div id="min_count_to_compile_expression">
  ## min\_count\_to\_compile\_expression
</div>

<SettingsInfoBlock type="UInt64" default_value="3" />

同一表达式在触发编译前的最少执行次数。

<div id="min_count_to_compile_regular_expression">
  ## min\_count\_to\_compile\_regular\_expression
</div>

<SettingsInfoBlock type="UInt64" default_value="3" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.7"},{"label": "3"},{"label": "控制正则表达式在被 JIT 编译之前至少需要使用多少次的新设置。"}]}]} />

同一正则表达式在被编译前需要执行的最小次数。

<div id="min_count_to_compile_sort_description">
  ## min\_count\_to\_compile\_sort\_description
</div>

<SettingsInfoBlock type="UInt64" default_value="3" />

相同排序描述在进行 JIT 编译前的出现次数