[jira] [Created] (DRILL-7441) Fix issues with fillEmpties, offset vectors

["Paul Rogers (Jira)" <ji...@apache.org>]

Paul Rogers created DRILL-7441:
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             Summary: Fix issues with fillEmpties, offset vectors
                 Key: DRILL-7441
                 URL: https://issues.apache.org/jira/browse/DRILL-7441
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Paul Rogers
            Assignee: Paul Rogers


Enable the vector validator with full testing of offset vectors. A number of operators trigger errors. Tracking down the issues, and adding detailed tests, it turns out that:

* Drill has an informal standard that zero-length batches should have zero-length offset vectors, while a batch of size 1 will have offset vectors of size 2. Thus, zero-length is a special case.
* Nullable, repeated and variable-width vectors have "fill empties" logic that is used in two places: when setting the value count and when preparing to write a new value. The current logic is not quite right for either case.

Detailed vector checks fail due to inconsistencies in how the above works. This PR fixes those issues.



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