[GitHub] [arrow-rs] viirya commented on issue #1587: test_read_maps fails when force_validate is active

[GitBox <gi...@apache.org>]

viirya commented on issue #1587:
URL: https://github.com/apache/arrow-rs/issues/1587#issuecomment-1103291817

   The inner map has data type in which the `key_value` field is nullable as false according to schema:
   
   Map(Field { name: "key_value", data_type: Struct([Field { name: "key", data_type: Utf8, nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }, Field { name: "value", data_type: Map(Field { name: "key_value", data_type: Struct([Field { name: "key", data_type: Int32, nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }, Field { name: "value", data_type: Boolean, nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }]), **_nullable: false_**, dict_id: 0, dict_is_ordered: false, metadata: None }, false), **_nullable: true_**, dict_id: 0, dict_is_ordered: false, metadata: None }]), nullable: false, dict_id: 0, dict_is_ordered: false, metadata: None }, false)
   
   But in `visit_map`, as it uses `Type.is_optional` as nullable flag for inner map, it takes optional value of the wrapping field of the map (i.e., the `value` field in top map) and that is true.
   
   That is why child array data's map type is not the same as the schema in the nullable flag.


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