0AyanamiRei opened a new pull request, #61025:
URL: https://github.com/apache/doris/pull/61025
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
When reading S3 files via TVF with` format = "csv_with_names"`, if the first
file in the directory is empty in content (e.g. contains only newlines, so size
> 0), schema inference fails with:
`The first line is empty, can not parse column numbers`
The FE only skips files with size == 0, so files with only
whitespace/newlines pass the check and get sent to BE, where
`_parse_col_names`/`_parse_col_nums `throws an InternalError on the empty first
line, blocking all other valid files from being read.
Solution:
csv_reader.cpp: Return EndOfFile instead of InternalError when the first
line is empty, signaling a skippable file rather than a fatal error.
internal_service.cpp: Iterate through all candidate ranges in
fetch_table_schema, skipping files that return EndOfFile, until a valid schema
is found.
ExternalFileTableValuedFunction.java: Send up to 5 candidate files as ranges
(instead of just the first one), so BE has fallback options without extra RPC
round-trips.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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