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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #767: DRILL-5226: Managed external sort fixes
Date Sat, 04 Mar 2017 02:21:31 GMT
Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/767#discussion_r104275436
  
    --- Diff: exec/vector/src/main/codegen/templates/VariableLengthVectors.java ---
    @@ -253,7 +253,7 @@ public int getPayloadByteCount() {
           // If 1 or more values, then the last value is set to
           // the offset of the next value, which is the same as
           // the length of existing values.
    -      return a.get(count-1);
    +      return a.get(count-1) + offsetVector.getPayloadByteCount();
    --- End diff --
    
    Added a comment. Basically, for planning purposes, the "payload" bytes for a Varchar vector
include the bytes taken to hold the text data PLUS the bytes needed by the offset vector that
points to those bytes. When averaged, it means a Varchar column width is 4 + avg. byte width.


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