Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13829#discussion_r68872391
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/codegen/BufferHolder.java
---
@@ -45,7 +45,13 @@ public BufferHolder(UnsafeRow row) {
}
public BufferHolder(UnsafeRow row, int initialSize) {
- this.fixedSize =
UnsafeRow.calculateBitSetWidthInBytes(row.numFields()) + 8 * row.numFields();
+ int bitsetWidthInBytes =
UnsafeRow.calculateBitSetWidthInBytes(row.numFields());
+ if (row.numFields() > (Integer.MAX_VALUE - initialSize -
bitsetWidthInBytes) / 8) {
--- End diff --
I don't quite understand this, we are trying to avoid overflow of
`this.fixedSize = UnsafeRow.calculateBitSetWidthInBytes(row.numFields()) + 8 *
row.numFields();` right? Why we `- initialSize` here?
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