Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19222#discussion_r172392078
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java
---
@@ -57,20 +59,20 @@
// The data stored in these two allocations need to maintain binary
compatible. We can
// directly pass this buffer to external components.
- private long nulls;
--- End diff --
I think that we use `MemoryBlock` for this column vector in
`reserveInternal()`. The method `reallocate()` returns `MemoryBlock`.
`this.nulls = MemoryAllocator.UNSAFE.reallocate(nulls, oldCapacity,
newCapacity);`
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