viirya commented on issue #1694:
URL: https://github.com/apache/arrow-rs/issues/1694#issuecomment-1137941649
Oh, that is because in your `build_batch` method, you create `Field` by:
```rust
fields.push(Field::new("as", array.data_type().clone(), true));
...
fields.push(Field::new("bs", array.data_type().clone(), true));
```
`dict_id` in `Field` is default to be 0.
So you duplicate dictionary ids.
I changed the code to the follows, and ran the C++ program without any issue:
```rust
fields.push(Field::new_dict("as", array.data_type().clone(), true, 0,
false));
...
fields.push(Field::new_dict("bs", array.data_type().clone(), true, 1,
false));
```
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