Logical operators :: Kloudfuse Docs

Logical operators

FuseQL logical operators combine two or more search filter expressions into a single compound condition. They must appear before the first pipe (|) in a query. The and operator requires both conditions to match; the or operator matches if either condition is true. Parentheses control evaluation order when mixing and and or.

and

Intersection operator (AND logic) between two search filter conditions. Selects only log lines that satisfy both conditions simultaneously. In regular search, AND is implied by writing two conditions side by side; in advanced search, write the keyword and explicitly.

Syntax

    label1="value1" label2="value2"
    ```

```none
    @facet1="value1" and @facet2="value2"
    ```

### Parameters

| Parameter          | Required | Description                                                              |
|--------------------|----------|--------------------------------------------------------------------------|
| left condition      | Yes      | A search filter expression on a label, facet, or term.                 |
| right condition     | Yes      | A second search filter expression that must also match.                 |

### Example

Filter nginx logs to show only `info`-level entries from a specific source.

```none
source="nginx" level="info"

Effect

Returns only log lines where both the source label equals nginx and the level label equals info.
In regular search, placing two conditions next to each other is equivalent to AND — no keyword is needed. In advanced search mode (prefix @ for facets), use the explicit and keyword to combine conditions. Parentheses can be used to group compound expressions: (source="nginx" and level="info") or source="nginx-error".

or

Union operator (OR logic) between two search filter conditions. Selects log lines that satisfy at least one of the conditions. In regular search, express OR using a quoted OR inside a field value; in advanced search, write the keyword or between two full expressions.

Syntax

    label="valueA OR valueB"
    ```

```none
    @facet="valueA" or @facet="valueB"
    ```

### Parameters

| Parameter          | Required | Description                                                              |
|--------------------|----------|--------------------------------------------------------------------------|
| left condition      | Yes      | A search filter expression on a label, facet, or term.                 |
| right condition     | Yes      | A second search filter expression; at least one must match.            |

### Example

Return log lines where the level is either `info` or `warning`.

```none
level="info OR warning"

Effect

Returns all log lines where level equals info or warning.
In regular search, the OR keyword must appear inside the quoted value string. In advanced search, use lowercase or between two @facet expressions: @level="info" or @level="warning". Use parentheses to control precedence when combining or with and.