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In the SchemaMetadata.pdl
I see the platformSchema as a union
``` /** The native schema in the dataset's platform. */
  platformSchema: union[
    EspressoSchema,
    OracleDDL,
    MySqlDDL,
    PrestoDDL,
    KafkaSchema,
    BinaryJsonSchema,
    OrcSchema,
    Schemaless,
    KeyValueSchema,
    OtherSchema
  ]```
If I've to mention for MongoDB, then which choice would be appropriate: `Schemaless`, *`KeyValueSchema`*, or `OtherSchema` ?