viirya commented on code in PR #40043:
URL: https://github.com/apache/arrow/pull/40043#discussion_r1486530907
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java/vector/src/main/java/org/apache/arrow/vector/BaseLargeVariableWidthVector.java:
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@@ -73,7 +73,8 @@ public BaseLargeVariableWidthVector(Field field, final
BufferAllocator allocator
lastValueCapacity = INITIAL_VALUE_ALLOCATION - 1;
valueCount = 0;
lastSet = -1;
- offsetBuffer = allocator.getEmpty();
+ // According to Arrow spec, the offsets buffer contains length + 1 elements
+ allocateOffsetBuffer(OFFSET_WIDTH);
Review Comment:
Hmm, maybe I should update the export code of C data interface here? I think
previously the empty offset buffer works like a lazy offset buffer in var-wide
arrays. They are expanded to valid format (length + 1) once the array has
elements.
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