[jira] [Created] (DRILL-7305) Multiple operators do not handle empty batches

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

Paul Rogers created DRILL-7305:
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             Summary: Multiple operators do not handle empty batches
                 Key: DRILL-7305
                 URL: https://issues.apache.org/jira/browse/DRILL-7305
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.16.0
            Reporter: Paul Rogers


While testing the new "EVF" framework, it was found that multiple operators incorrectly handle empty batches. The EVF framework is set up to return a "fast schema" empty batch with only schema as its first batch. It turns out that many operators fail with problems such as:

* Failure to set the value counts in the output container
* Fail to initialize the offset vector position 0 to 0 for variable-width or repeated vectors

And so on.

Partial fixes are in the JSON reader PR.

For now, the easiest work-around is to disable the "fast schema" path in the EVF.



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