emilie-wang opened a new pull request, #769:
URL: https://github.com/apache/incubator-xtable/pull/769
## What is the purpose of the pull request
While converting from Delta table, the nested field's stats gets lost.
Example:
```
root
|-- a: struct (nullable = true)
| |-- b: string (nullable = true)
| |-- c: integer (nullable = true)
```
Column stats for a.b and a.c wasn't processed correctly.
This Pr aims to fix it.
## Brief change log
The pr make sure the nested field's stats is extracted.
## Verify this pull request
This pull request is already covered by existing tests, such as
https://github.com/emilie-wang/incubator-xtable/blob/27f6a162082a04c21755ff49184c34a975caef00/xtable-core/src/test/java/org/apache/xtable/delta/TestDeltaStatsExtractor.java#L119
The test doesn't need change because it uses `List<InternalField> fields =
schema.getAllFields();` instead of `List<InternalField> fields =
schema.getAllFields();`, so that no nested fields are filtered out.
- Add a new nested field into the existing test.
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