# UnstableEvaluationRuleFilterOneOf9
## Properties
**column** | **String** | Column to filter on. In the unstable public API this is currently `parentObservationId`. |
**operator** | [**models::UnstableEvaluationRuleNullFilterOperator**](UnstableEvaluationRuleNullFilterOperator.md) | |
**value** | Option<**String**> | Ignored placeholder value. Clients may omit it or send an empty string. | [optional]
**r#type** | **Type** | (enum: null) |
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