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Posted to issues@drill.apache.org by "Paul Rogers (JIRA)" <ji...@apache.org> on 2019/06/24 02:13:00 UTC

[jira] [Created] (DRILL-7306) Disable "fast schema" batch for new scan framework

Paul Rogers created DRILL-7306:
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             Summary: Disable "fast schema" batch for new scan framework
                 Key: DRILL-7306
                 URL: https://issues.apache.org/jira/browse/DRILL-7306
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.16.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers
             Fix For: 1.17.0


 The EVF framework is set up to return a "fast schema" empty batch with only schema as its first batch because, when the code was written, it seemed that's how we wanted operators to work. However, DRILL-7305 notes that many operators cannot handle empty batches.

Since the empty-batch bugs show that Drill does not, in fact, provide a "fast schema" batch, this ticket asks to disable the feature in the new scan framework. The feature is disabled with a config option; it can be re-enabled if ever it is needed.



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