JeremyXin opened a new pull request, #12861:
URL: https://github.com/apache/seatunnel/pull/12861
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### Purpose of this pull request
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request adds checkstyle plugin.-->
Fixes #12860.
In PR #9760, @Hisoka-X showed that `child_ids` should contain an array of
element IDs. The existing `MarkdownReadStrategy` instead emits comma-separated
IDs for some elements and `null` for leaves. It also omits section
relationships between headings and their content.
This PR assigns parent and child relationships to Markdown sections while
preserving existing relationships within lists and other nested elements. It
changes the Markdown `child_ids` schema to `ARRAY<STRING>` and emits a
`String[]` for every row, consistent with the expected structured document
output.
### Does this PR introduce _any_ user-facing change?
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Yes. Markdown rows previously exposed `child_ids` as `STRING`, with
comma-separated IDs or `null`. They now expose it as `ARRAY<STRING>`, with an
empty array for elements without children. Downstream consumers that read this
field must update their schema and handling.
The English and Chinese file source documentation and incompatible changes
notes have been updated.
### How was this patch tested?
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it was difficult to add.
If you are adding E2E test cases, maybe refer to
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- Passed targeted `MarkdownReadStrategyTest`, `BaseFileSourceTest`, and
`PdfReadStrategyTest` tests (13, 7, and 9 tests respectively).
- Added assertions for heading hierarchy, nested AST relationships,
`child_ids` array values, and the discovered schema.
### Check list
* [ ] If any new Jar binary package adding in your PR, please add License
Notice according
[New License
Guide](https://github.com/apache/seatunnel/blob/dev/docs/en/developer/new-license.md)
* [ ] If necessary, please update the documentation to describe the new
feature. https://github.com/apache/seatunnel/tree/dev/docs
* [ ] If necessary, please update `incompatible-changes.md` to describe the
incompatibility caused by this PR.
* [ ] If you are contributing the connector code, please check that the
following files are updated:
1. Update
[plugin-mapping.properties](https://github.com/apache/seatunnel/blob/dev/plugin-mapping.properties)
and add new connector information in it
2. Update the pom file of
[seatunnel-dist](https://github.com/apache/seatunnel/blob/dev/seatunnel-dist/pom.xml)
3. Add ci label in
[label-scope-conf](https://github.com/apache/seatunnel/blob/dev/.github/workflows/labeler/label-scope-conf.yml)
4. Add e2e testcase in
[seatunnel-e2e](https://github.com/apache/seatunnel/tree/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/)
5. Update connector
[plugin_config](https://github.com/apache/seatunnel/blob/dev/config/plugin_config)
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