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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