zhuqi-lucas opened a new pull request, #19924:
URL: https://github.com/apache/datafusion/pull/19924
## Which issue does this PR close?
Closes #19920
## Rationale for this change
DataFusion currently only supports line-delimited JSON (NDJSON) format. Many
data sources provide JSON in array format `[{...}, {...}]`, which cannot be
parsed by the existing implementation.
## What changes are included in this PR?
- Add `format_array` option to `JsonOptions` to support JSON array format
- Implement schema inference for JSON array format
- Implement data reading for JSON array format
- Add protobuf serialization support for the new option
- SQL support via `OPTIONS ('format.format_array' 'true')`
## Are these changes tested?
Yes:
- Unit tests for schema inference (normal, empty array, with limit)
- Unit tests for data reading and projection
- SQLLogicTest for end-to-end SQL validation
## Are there any user-facing changes?
Yes. Users can now read JSON array format files by specifying the
`format.format_array` option:
```sql
CREATE EXTERNAL TABLE my_table
STORED AS JSON
OPTIONS ('format.format_array' 'true')
LOCATION 'path/to/array.json';
```
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