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https://issues.apache.org/jira/browse/DRILL-7306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880030#comment-16880030
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ASF GitHub Bot commented on DRILL-7306:
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paul-rogers commented on issue #1813: DRILL-7306: Disable schema-only batch for
new scan framework
URL: https://github.com/apache/drill/pull/1813#issuecomment-509087121
@arina-ielchiieva, thank you for running the tests. Glad to hear we finally
have a clean run.
I've squashed commits. Since this PR has been a struggle, let's do commit it
by itself. Once that is done, I will rebase the other two PRs, then combine
them into a single merge branch for your convenience.
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> 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
> 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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