viirya commented on code in PR #967:
URL: https://github.com/apache/arrow-java/pull/967#discussion_r2714546508
##########
vector/src/test/java/org/apache/arrow/vector/TestListVector.java:
##########
@@ -1379,6 +1379,45 @@ public void testCopyValueSafeForExtensionType() throws
Exception {
}
}
+ @Test
+ public void testNestedEmptyListOffsetBuffer() {
+ // Test that 3-level nested ListVector properly allocates offset buffers
+ // even when nested writers are never invoked. According to Arrow spec,
+ // offset buffer must have N+1 entries. Even when N=0, it should contain
[0].
+ try (ListVector level0 = ListVector.empty("level0", allocator)) {
+ // Setup List<List<List<Int>>> - 3 levels
+ level0.addOrGetVector(FieldType.nullable(MinorType.LIST.getType()));
+ ListVector level1 = (ListVector) level0.getDataVector();
+ level1.addOrGetVector(FieldType.nullable(MinorType.LIST.getType()));
+ ListVector level2 = (ListVector) level1.getDataVector();
+ level2.addOrGetVector(FieldType.nullable(MinorType.INT.getType()));
+
+ // Only allocate level0 - simulates case where all nested levels are
empty
+ level0.allocateNew();
+ level0.setValueCount(0);
Review Comment:
ditto
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