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https://issues.apache.org/jira/browse/DRILL-5546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135709#comment-16135709
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ASF GitHub Bot commented on DRILL-5546:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r134287754
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/config/Project.java
---
@@ -46,14 +56,18 @@ public Project(@JsonProperty("exprs")
List<NamedExpression> exprs, @JsonProperty
return exprs;
}
+ public boolean isOutputProj() {
--- End diff --
Maybe a comment to explain the purpose of this attribute? To quote from the
PR description:
> Add a new flag 'outputProj' to Project operator, to indicate if Project
is for the query's final output. Such Project is added by TopProjectVisitor, to
handle fast NONE when all the inputs to the query are empty
and are skipped.
> Schema change problems caused by empty batch
> --------------------------------------------
>
> Key: DRILL-5546
> URL: https://issues.apache.org/jira/browse/DRILL-5546
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
>
> There have been a few JIRAs opened related to schema change failure caused by
> empty batch. This JIRA is opened as an umbrella for all those related JIRAS (
> such as DRILL-4686, DRILL-4734, DRILL4476, DRILL-4255, etc).
>
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