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Posted to issues@paimon.apache.org by "thswlsqls (via GitHub)" <gi...@apache.org> on 2026/08/10 10:38:58 UTC
[PR] [lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation [paimon]
thswlsqls opened a new pull request, #9150:
URL: https://github.com/apache/paimon/pull/9150
### Purpose
fix #9149
- `LanceRowTypeVisitor` accepted VARIANT and BLOB, but the `paimon-arrow` bridge supports neither.
- VARIANT writes succeed today, but `SELECT *` fails with a message-less `UnsupportedOperationException` in `Arrow2PaimonVectorConverter#visit(VariantType)` — the written column can never be read back. Rejecting it blocks silent data loss, not a working path.
- BLOB reaches this visitor only through `blob-descriptor-field` / `blob-view-field`, which require `data-evolution.enabled = true`; those inline BLOBs already fail at INSERT. Managed BLOB columns in dedicated blob files are unaffected.
- Matches `VortexFileFormat` and `MosaicFileFormat`, which reject both types, and follows #8678 (MULTISET).
- Related: #9102 (ARRAY element types, merged) — a different method in the same visitor.
### Tests
- Added `LanceFileFormatTest#testValidateDataFields_UnsupportedVariantType` and `#testValidateDataFields_UnsupportedBlobType`.
- `mvn -pl paimon-lance -DfailIfNoTests=false clean install` (JDK 11) — 89 tests, 0 failures, 0 errors, 6 skipped. checkstyle, spotless and enforcer passed.
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Re: [PR] [lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation [paimon]
Posted by "JingsongLi (via GitHub)" <gi...@apache.org>.
JingsongLi commented on PR #9150:
URL: https://github.com/apache/paimon/pull/9150#issuecomment-5240822457
+1
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Re: [PR] [lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation [paimon]
Posted by "JingsongLi (via GitHub)" <gi...@apache.org>.
JingsongLi merged PR #9150:
URL: https://github.com/apache/paimon/pull/9150
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