LeftExpression 
    Left expression of the event metadata filter.
Inheritors
Types
Functions
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                  Casts this LeftExpression as a MetadataKey and retrieves its kotlin.String value. Throws an exception if the LeftExpression is not a MetadataKey.
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                  Casts this LeftExpression as a MetadataKey and retrieves its kotlin.String value. Returns null if the LeftExpression is not a MetadataKey.