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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