jeff3071 opened a new pull request, #72246:
URL: https://github.com/apache/airflow/pull/72246
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## Why
`DocumentLoaderOperator` supports regular JSON, but it does not recognize
JSON Lines (`.jsonl`) files.
## What
- Add built-in `.jsonl` parsing without additional dependencies.
- Produce **one document per non-empty line** and assign consecutive
`item_index` metadata.
- Support JSON Lines from file paths, directory discovery, and
`source_bytes` with `file_type=".jsonl"`.
### Different with JSON file
For example, this regular JSON file produces two documents because its
top-level array is expanded:
```json
[
{"body": "First"},
{"body": "Second"}
]
```
In a JSON Lines file, each non-empty line produces exactly one document. The
array on the first line remains one document instead of being expanded, so this
file also produces two documents:
```jsonl
[{"body": "First"}, {"body": "Second"}]
{"body": "Third"}
```
## Testing
### Before
```
::group::Log message source details
/root/airflow/logs/dag_id=example_document_loader_jsonl/run_id=manual__2026-08-29T06:23:56.559631+00:00/task_id=load_events/attempt=1.log
::endgroup::
[2026-08-29T06:23:57.671540Z] INFO - ::group::Pre Execute
Task Identity ti_id=01a04c30-6aa2-7411-a073-f1ad1073cd42
dag_id=example_document_loader_jsonl task_id=load_events
run_id=manual__2026-08-29T06:23:56.559631+00:00 try_number=1 map_index=-1
[2026-08-29T06:24:03.707696Z] INFO - DAG bundles loaded: dags-folder
[2026-08-29T06:24:03.708918Z] INFO - Filling up the DagBag from
/files/dags/example_document_loader_jsonl.py
[2026-08-29T06:24:03.781146Z] INFO - Worker startup parse complete
bundle_name=dags-folder bundle_version=null
dag_file=example_document_loader_jsonl.py bundle_prepare_ms=4
dag_file_parse_ms=72
[2026-08-29T06:24:03.824981Z] INFO - ::endgroup::
[2026-08-29T06:24:03.825318Z] ERROR - Task failed with exceptionValueError:
No parser registered for extension '.jsonl'. Supported extensions: .csv, .docx,
.json, .md, .pdf, .txt. Set 'parser' explicitly to override auto-detection.
```
### After
```
::group::Log message source details
/root/airflow/logs/dag_id=example_document_loader_jsonl/run_id=manual__2026-08-29T06:10:10.890844+00:00/task_id=load_events/attempt=1.log
::endgroup::
[2026-08-29T06:10:11.897592Z] INFO - ::group::Pre Execute
Task Identity ti_id=01a04c23-d167-7cbb-b0a1-888ca1cbeed1
dag_id=example_document_loader_jsonl task_id=load_events
run_id=manual__2026-08-29T06:10:10.890844+00:00 try_number=1 map_index=-1
[2026-08-29T06:10:17.924766Z] INFO - DAG bundles loaded: dags-folder
[2026-08-29T06:10:17.926232Z] INFO - Filling up the DagBag from
/files/dags/example_document_loader_jsonl.py
[2026-08-29T06:10:18.003334Z] INFO - Worker startup parse complete
bundle_name=dags-folder bundle_version=null
dag_file=example_document_loader_jsonl.py bundle_prepare_ms=3
dag_file_parse_ms=77
[2026-08-29T06:10:18.046544Z] INFO - ::endgroup::
[2026-08-29T06:10:18.047021Z] INFO - Parsed 3 documents from 1 file(s)
[2026-08-29T06:10:18.047139Z] INFO - ::group::Post Execute
[2026-08-29T06:10:18.047330Z] INFO - Pushing xcom
ti=RuntimeTaskInstance(id=UUID('01a04c23-d167-7cbb-b0a1-888ca1cbeed1'),
task_id='load_events', dag_id='example_document_loader_jsonl',
run_id='manual__2026-08-29T06:10:10.890844+00:00', try_number=1,
dag_version_id=UUID('01a04c22-161b-7e24-bb58-fbac6568e066'), map_index=-1,
hostname='d5873b0b3ad5', context_carrier={'traceparent':
'00-a8201c08aed315888a0215944bfaf514-c055bbb704c1e9ff-00'}, queue='default',
task=<Task(DocumentLoaderOperator): load_events>,
bundle_instance=LocalDagBundle(name=dags-folder), max_tries=0,
start_date=datetime.datetime(2026, 8, 29, 6, 10, 17, 912797,
tzinfo=datetime.timezone.utc), end_date=None, state=<TaskInstanceState.RUNNING:
'running'>, is_mapped=False, rendered_map_index=None, sentry_integration='')
[2026-08-29T06:10:18.095744Z] INFO - ::endgroup::
```
---
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