[hive] Support multiset type in hive writes - #9081
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JingsongLi merged 1 commit intoAug 6, 2026
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SchemaVisitor dispatched MULTISET to the primitive branch, so writing a multiset column through PaimonSerDe threw ClassCastException. Visit it as a map from element to count, the same mapping the read side already uses. Generated-by: Claude Code
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Purpose
fix #9078
PaimonObjectInspectorFactory), but the write-side dispatcherSchemaVisitor.visit()branches onROW/ARRAY/MAPonly.MULTISETfalls through todefault: visitor.primitive(...), soHiveDeserializer.primitive()throwsClassCastException: StandardMapObjectInspector cannot be cast to PrimitiveObjectInspectoron the first row — reads work, writes do not.MULTISETasMapType(elementType, IntType), the mappingPaimonObjectInspectorFactoryalready uses. Other type branches are untouched.Tests
PaimonSerDeTest#testSerializeMultiset: serializesid INT, tags MULTISET<STRING>through a HiveStandardStructObjectInspectorand asserts the resultingInternalMap.mvn -pl paimon-hive/paimon-hive-connector-common clean install— 101 unit tests and 83*ITCasetests passed, includingHiveWriteITCase.