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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