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.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
