Yaohua628 opened a new pull request, #38777:
URL: https://github.com/apache/spark/pull/38777
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### What changes were proposed in this pull request?
A follow-up PR of https://github.com/apache/spark/pull/38683.
Apart from making `_metadata` struct not nullable, we should also make all
fields inside of `_metadata` not nullable (`file_path`, `file_name`,
`file_modification_time`, `file_size`, `row_index`).
### Why are the changes needed?
Consistent nullability behavior for everything
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
New UTs
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