hubgeter opened a new pull request, #68004:
URL: https://github.com/apache/doris/pull/68004
### What problem does this PR solve?
Issue Number: N/A
Related PR: apache/doris#68003 (same fix for branch-4.1)
Problem Summary:
When the Iceberg table property `schema.name-mapping.default` is present but
malformed, `IcebergSchemaUtils.extractNameMapping` caught the parse failure and
rebuilt a "current schema" name mapping, which is authoritative. Data files
that do not carry Iceberg field ids could then only be resolved by their
current column names. After a column rename the old physical column is
unmatched, V2 semantics materializes NULL for it, and the query succeeds with
historical values lost. If the old name was later reused by another column, the
fallback could even bind the wrong physical column.
Iceberg itself does not degrade like this: Spark's `BaseReader` parses
`schema.name-mapping.default` while constructing the reader and fails the query
for a malformed value (`IllegalArgumentException` / `UncheckedIOException`),
regardless of whether the data files carry field ids.
This PR removes the current-schema fallback and reports the metadata fault
instead. The connector now throws a `DorisConnectorException` that names the
table, the property, the root cause and the remediation, so the failure is
visible instead of silently returning NULL. Metadata (system) table scans are
unaffected, because the schema-evolution carrier is only built for base-table
scans.
### Release note
None
### Check List (For Author)
- Test
- [ ] Regression test
- [x] 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
- Behavior changed:
- [x] Yes.
- Does this need documentation?
- [ ] No.
- [ ] Yes.
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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