0AyanamiRei opened a new pull request, #67411:
URL: https://github.com/apache/doris/pull/67411
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: JSON schema inference lowercased field names before
creating the table-valued function schema, while JSON readers match object keys
case-sensitively. Uppercase keys therefore appeared as queryable lowercase
columns but were silently materialized as NULL. Preserve the inferred key
casing for JSON only, while retaining case-insensitive duplicate detection and
the existing lowercase behavior for other file formats.
### Release note
JSON table-valued functions now read inferred mixed-case and uppercase keys
without silently producing NULL values.
### Check List (For Author)
- Test: Regression test and manual tests
- Regression test: `test_json_uppercase_keys` (raw and jsonpaths control)
- Manual test: File Scanner V2, legacy scanner, and `http_stream`
returned the two expected rows
- Manual compatibility test: CSV inferred column names remained lowercase
- Behavior changed: Yes. Inferred JSON field names preserve source casing.
- Does this need documentation: No
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