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27 lines
941 B
Markdown
27 lines
941 B
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) > [Execution](./kibana-plugin-plugins-expressions-public.execution.md) > [start](./kibana-plugin-plugins-expressions-public.execution.start.md)
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## Execution.start() method
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Call this method to start execution.
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N.B. `input` is initialized to `null` rather than `undefined` for legacy reasons, because in legacy interpreter it was set to `null` by default.
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<b>Signature:</b>
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```typescript
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start(input?: Input, isSubExpression?: boolean): Observable<ExecutionResult<Output | ExpressionValueError>>;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| input | <code>Input</code> | |
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| isSubExpression | <code>boolean</code> | |
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<b>Returns:</b>
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`Observable<ExecutionResult<Output | ExpressionValueError>>`
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