Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13680#discussion_r69372511
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/codegen/UnsafeArrayWriter.java
---
@@ -33,91 +38,147 @@
// The offset of the global buffer where we start to write this array.
private int startingOffset;
+ // The number of elements in this array
+ private int numElements;
+
+ private int headerInBytes;
+
+ private void assertIndexIsValid(int index) {
+ assert index >= 0 : "index (" + index + ") should >= 0";
+ assert index < numElements : "index (" + index + ") should < " +
numElements;
+ }
+
public void initialize(BufferHolder holder, int numElements, int
fixedElementSize) {
- // We need 4 bytes to store numElements and 4 bytes each element to
store offset.
--- End diff --
We still need to comment about the `numElements` stuff, or it will confuse
other reader when they see `startingOffset + 4` later.
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