asMetadataKey
Casts this MemoryRecordLeftExpression as a MetadataKey and retrieves its kotlin.String value. Throws an exception if the MemoryRecordLeftExpression is not a MetadataKey.
Casts this MemoryRecordLeftExpression as a MetadataKey and retrieves its kotlin.String value. Throws an exception if the MemoryRecordLeftExpression is not a MetadataKey.