mnpw opened a new issue, #5843:
URL: https://github.com/apache/arrow-rs/issues/5843
**Describe the bug**
`Schema::try_merge` should be able to merge List(<any> data type) and
List(Null data type)
**To Reproduce**
```rust
use serde_json::json;
let o_1 = vec![
json!({"a": [1,2,3]}),
json!({"a": [4,5,6]}),
];
let o_2 = vec![
json!({"a": []}),
json!({"a": []}),
];
let o_3 = vec![
json!({"a": []}),
json!({"a": [7,8,9]}),
];
let schema_1 =
arrow_json::reader::infer_json_schema_from_iterator(o_1.iter().map(Ok)).unwrap();
println!("{:?}", schema_1);
// Schema { fields: [Field { name: "a", data_type: List(Field { name:
"item", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered: false,
metadata: {} }), nullable: true, dict_id: 0, dict_is_ordered: false, metadata:
{} }], metadata: {} }
let schema_2 =
arrow_json::reader::infer_json_schema_from_iterator(o_2.iter().map(Ok)).unwrap();
println!("{:?}", schema_2);
// Schema { fields: [Field { name: "a", data_type: List(Field { name:
"item", data_type: Null, nullable: true, dict_id: 0, dict_is_ordered: false,
metadata: {} }), nullable: true, dict_id: 0, dict_is_ordered: false, metadata:
{} }], metadata: {} }
let schema_3 =
arrow_json::reader::infer_json_schema_from_iterator(o_3.iter().map(Ok)).unwrap();
println!("{:?}", schema_3);
// Schema { fields: [Field { name: "a", data_type: List(Field { name:
"item", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered: false,
metadata: {} }), nullable: true, dict_id: 0, dict_is_ordered: false, metadata:
{} }], metadata: {} }
let merged = Schema::try_merge([schema_1, schema_2, schema_3]);
println!("{:?}", merged)
// Err(SchemaError("Fail to merge schema field 'a' because the from
data_type = List(Field { name: \"item\", data_type: Null, nullable: true,
dict_id: 0, dict_is_ordered: false, metadata: {} }) does not equal List(Field {
name: \"item\", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered:
false, metadata: {} })"))
```
**Expected behavior**
Merge of List(<any> data type) and List(Null) should be possible
```rust
let merged = Schema::try_merge([schema_1, schema_2, schema_3]);
println!("{:?}", merged)
// Ok(Schema { fields: [Field { name: "a", data_type: List(Field { name:
"item", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered: false,
metadata: {} }), nullable: true, dict_id: 0, dict_is_ordered: false, metadata:
{} }], metadata: {} })
```
**Additional context**
N/A
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