Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/17773#discussion_r113687190
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java
---
@@ -410,53 +410,53 @@ protected void reserveInternal(int newCapacity) {
int[] newLengths = new int[newCapacity];
int[] newOffsets = new int[newCapacity];
if (this.arrayLengths != null) {
- System.arraycopy(this.arrayLengths, 0, newLengths, 0,
elementsAppended);
- System.arraycopy(this.arrayOffsets, 0, newOffsets, 0,
elementsAppended);
+ System.arraycopy(this.arrayLengths, 0, newLengths, 0, capacity);
--- End diff --
`elementsAppended` is necessary to keep the tail position by
`append<TYPE>()`.
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