Github user Ben-Zvi commented on a diff in the pull request:

    https://github.com/apache/drill/pull/860#discussion_r127358527
  
    --- Diff: 
exec/vector/src/main/java/org/apache/drill/exec/vector/AllocationHelper.java ---
    @@ -26,14 +26,16 @@ public static void allocate(ValueVector v, int 
valueCount, int bytesPerValue) {
         allocate(v, valueCount, bytesPerValue, 5);
       }
     
    -  public static void allocatePrecomputedChildCount(ValueVector v, int 
valueCount, int bytesPerValue, int childValCount){
    -    if(v instanceof FixedWidthVector) {
    +  public static void allocatePrecomputedChildCount(ValueVector v, int 
valueCount, int bytesPerValue, int childValCount) {
    --- End diff --
    
    Discouraged: single letter parameter/field names. Even **"vv"** would be 
easier to search, if needed.



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