Github user maropu commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20850#discussion_r177793302
  
    --- Diff: 
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/codegen/BufferHolder.java
 ---
    @@ -86,11 +88,39 @@ public void grow(int neededSize) {
         }
       }
     
    -  public void reset() {
    +  byte[] buffer() {
    +    return buffer;
    +  }
    +
    +  int getCursor() {
    +    return cursor;
    +  }
    +
    +  void incrementCursor(int val) {
    +    cursor += val;
    +  }
    +
    +  int pushCursor() {
    --- End diff --
    
    I also feel the current code is a bit complicated. Can't we avoid the 
sharing?


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