0AyanamiRei opened a new pull request, #67407:
URL: https://github.com/apache/doris/pull/67407
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: File table-valued functions returned only explicitly
declared CSV columns when `csv_schema` was set, so columns derived from
`path_partition_keys` disappeared from the table schema. Append the path
partition columns to the explicit CSV schema, preserving their declared order
and VARCHAR type.
### Release note
CSV file table-valued functions now expose path partition columns when
`csv_schema` is specified.
### Check List (For Author)
- Test: FE unit test and regression test
- FE unit test:
`ExternalFileTableValuedFunctionTest#testCsvSchemaIncludesPathPartitionColumns`
- Regression test: `test_csv_schema_with_path_partition_keys`
- Behavior changed: Yes. Path partition columns remain available with an
explicit CSV schema.
- Does this need documentation: No
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