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[lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation #9150

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Merged
JingsongLi merged 1 commit into from
Aug 10, 2026
+19 −2
Merged

[lance] Reject unsupported VARIANT and BLOB types in LanceFileFormat schema validation #9150

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5 changes: 3 additions & 2 deletions paimon-lance/src/main/java/org/apache/paimon/format/lance/LanceFileFormat.java
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Original file line number Diff line number Diff line change
Expand Up @@ -180,12 +180,13 @@ public Void visit(LocalZonedTimestampType localZonedTimestampType) {

@Override
public Void visit(VariantType variantType) {
return null;
throw new UnsupportedOperationException(
"Lance file format does not support type VARIANT");
}

@Override
public Void visit(BlobType blobType) {
return null;
throw new UnsupportedOperationException("Lance file format does not support type BLOB");
}

@Override
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16 changes: 16 additions & 0 deletions paimon-lance/src/test/java/org/apache/paimon/format/lance/LanceFileFormatTest.java
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Expand Up @@ -101,4 +101,20 @@ public void testValidateDataFields_SupportedTypes() {
// Validate that no exception is thrown for supported types
assertDoesNotThrow(() -> format.validateDataFields(rowType));
}

@Test
public void testValidateDataFields_UnsupportedVariantType() {
LanceFileFormat format =
new LanceFileFormat(new FileFormatFactory.FormatContext(new Options(), 1024, 1024));
RowType rowType = RowType.of(DataTypes.VARIANT());
assertThrows(UnsupportedOperationException.class, () -> format.validateDataFields(rowType));
}

@Test
public void testValidateDataFields_UnsupportedBlobType() {
LanceFileFormat format =
new LanceFileFormat(new FileFormatFactory.FormatContext(new Options(), 1024, 1024));
RowType rowType = RowType.of(DataTypes.BLOB());
assertThrows(UnsupportedOperationException.class, () -> format.validateDataFields(rowType));
}
}
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