[iceberg] Support the variant type in Iceberg schema type conversion#8795
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[iceberg] Support the variant type in Iceberg schema type conversion#8795plusplusjiajia wants to merge 1 commit into
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Purpose
Map the Iceberg
varianttype inIcebergDataFieldso a schema with aVariantTypecolumn converts between Paimon and Iceberg types both ways; before this it threw
Unsupported data type: VariantType.variantis an Iceberg v3 type needing row lineage, which Paimon's own Iceberg metadatageneration does not support, so a schema containing it is rejected during metadata
generation (as an older release already did) rather than emitting unreadable metadata.
Also fixes a pre-existing bug: an array's
element-requiredflag was taken from thearray's nullability instead of the element type's.
Note
Rejection happens during post-commit metadata generation (a property of Paimon's
Iceberg callback, unchanged from the prior
Unsupported data typebehavior), not atwrite validation.
Tests
IcebergDataFieldTest: variant forward/reverse conversion, JSON round-trip, arrayelement-nullability.
IcebergCompatibilityTest: rejects a schema containing variant.RESTCatalogTest#testCreateIcebergTable: variant column round-trips through create + get.