> ## 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.

# validate_* session settings

> ClickHouse session settings in the validate_* generated group.

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
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are available in [system.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="validate_enum_literals_in_operators">
  validate\_enum\_literals\_in\_operators
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.1"},{"label": "0"},{"label": "A new setting"}]}]} />

If enabled, validate enum literals in operators like `IN`, `NOT IN`, `==`, `!=` against the enum type and throw an exception if the literal is not a valid enum value.

<h2 id="validate_mutation_query">
  validate\_mutation\_query
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.11"},{"label": "1"},{"label": "New setting to validate mutation queries by default."}]}]} />

Validate mutation queries before accepting them. Mutations are executed in the background, and running an invalid query will cause mutations to get stuck, requiring manual intervention.

Only change this setting if you encounter a backward-incompatible bug.

<h2 id="validate_polygons">
  validate\_polygons
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "20.4"},{"label": "1"},{"label": "Throw exception if polygon is invalid in function pointInPolygon by default instead of returning possibly wrong results"}]}]} />

Enables or disables throwing an exception in the [pointInPolygon](/docs/reference/functions/regular-functions/geo/coordinates#pointinpolygon) function, if the polygon is self-intersecting or self-tangent.

Possible values:

* 0 — Throwing an exception is disabled. `pointInPolygon` accepts invalid polygons and returns possibly incorrect results for them.
* 1 — Throwing an exception is enabled.