Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13680#discussion_r69372467
--- 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.
- final int fixedSize = 4 + 4 * numElements;
+ this.numElements = numElements;
+ this.headerInBytes = calculateHeaderPortionInBytes(numElements);
this.holder = holder;
this.startingOffset = holder.cursor;
- holder.grow(fixedSize);
- Platform.putInt(holder.buffer, holder.cursor, numElements);
- holder.cursor += fixedSize;
+ // Grows the global buffer ahead for header and fixed size data.
+ holder.grow(headerInBytes + fixedElementSize * numElements);
+
+ // Initialize information in header
+ Platform.putInt(holder.buffer, startingOffset, numElements);
+ Arrays.fill(holder.buffer, startingOffset + 4 -
Platform.BYTE_ARRAY_OFFSET,
--- End diff --
is it faster than `UnsafeRowWriter.zeroOutNullBytes`?
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