# NullEvaluationRuleFilter
## Properties
Name | Type | Description | Notes
------------ | ------------- | ------------- | -------------
**column** | **String** | Column to filter on, for example `parentObservationId`. |
**operator** | [**models::EvaluationRuleNullFilterOperator**](EvaluationRuleNullFilterOperator.md) | |
**value** | **String** | Required empty-string placeholder used by the runtime filter contract. |
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