Weijun-H commented on PR #12194:
URL: https://github.com/apache/datafusion/pull/12194#issuecomment-2312474996
> Encounter a bug. Fixed it by changing field name to `item`. But why ?
>
> ```
> Internal error: Failed due to a difference in schemas, original schema:
DFSchema { inner: Schema { fields: [Field { name:
"map_keys(map(make_array(Int64(1),Int64(2),Int64(3)),make_array(Int64(1),Int64(2),Int64(3))))",
data_type: List(Field { name: "keys", data_type: Int64, nullable: false,
dict_id: 0, dict_is_ordered: false, metadata: {} }), nullable: true, dict_id:
0, dict_is_ordered: false, metadata: {} }], metadata: {} }, field_qualifiers:
[None], functional_dependencies: FunctionalDependencies { deps: [] } }, new
schema: DFSchema { inner: Schema { fields: [Field { name:
"map_keys(map(make_array(Int64(1),Int64(2),Int64(3)),make_array(Int64(1),Int64(2),Int64(3))))",
data_type: List(Field { name: "item", data_type: Int64, nullable: false,
dict_id: 0, dict_is_ordered: false, metadata: {} }), nullable: false, dict_id:
0, dict_is_ordered: false, metadata: {} }], metadata: {} }, field_qualifiers:
[None], functional_dependencies: FunctionalDependencies { deps: [] } }.
> ```
I think it is caused by the pre-defined field name in `make_array`.
https://github.com/apache/datafusion/blob/7e9ea3ad59071d56093c197c5ecd5c50021deb94/datafusion/functions-nested/src/map.rs#L33-L39
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