[lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation - #9150
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JingsongLi merged 1 commit intoAug 10, 2026
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…schema validation LanceRowTypeVisitor accepted VariantType and BlobType, but the paimon-arrow bridge cannot convert either one. Reject both at schema validation, matching the sibling Vortex and Mosaic formats. Generated-by: Claude Code
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Purpose
fix #9149
LanceRowTypeVisitoraccepted VARIANT and BLOB, but thepaimon-arrowbridge supports neither.SELECT *fails with a message-lessUnsupportedOperationExceptioninArrow2PaimonVectorConverter#visit(VariantType)— the written column can never be read back. Rejecting it blocks silent data loss, not a working path.blob-descriptor-field/blob-view-field, which requiredata-evolution.enabled = true; those inline BLOBs already fail at INSERT. Managed BLOB columns in dedicated blob files are unaffected.VortexFileFormatandMosaicFileFormat, which reject both types, and follows [lance] Reject unsupported MULTISET type in LanceFileFormat schema validation #8678 (MULTISET).Tests
LanceFileFormatTest#testValidateDataFields_UnsupportedVariantTypeand#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.