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

["Arina Ielchiieva (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-7306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arina Ielchiieva updated DRILL-7306:
------------------------------------
    Reviewer: Arina Ielchiieva

> 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
>            Priority: Major
>              Labels: ready-to-commit
>             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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