Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18425#discussion_r125869562
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnVector.java
---
@@ -80,6 +80,14 @@ public static ColumnVector allocate(int capacity,
DataType type, MemoryMode mode
public int length;
public int offset;
+ // reused buffer to return a primitive array
--- End diff --
I'm not sure if we need this buffer. `UnsafeArrayData.toXXXArray` doesn't
use a buffer, and it seems safer to always return a new array.
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