[
https://issues.apache.org/jira/browse/DRILL-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187551#comment-15187551
]
ASF GitHub Bot commented on DRILL-4476:
---------------------------------------
Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/407#discussion_r55561579
--- Diff: exec/java-exec/src/test/java/org/apache/drill/TestUnionAll.java
---
@@ -527,6 +532,52 @@ public void testUnionAllRightEmptyJson() throws
Exception {
.build().run();
}
+ @Test
+ public void testUnionAllLeftEmptyJson() throws Exception {
--- End diff --
Are there any union-all tests with WHERE 1 = 0 filters on the left and/or
right inputs ? If not, could you add such tests ? We should distinguish
between a truly empty input vs. one that occurs as a result of a False filter.
> Enhance Union-All operator for dealing with empty left input or empty both
> inputs
> ---------------------------------------------------------------------------------
>
> Key: DRILL-4476
> URL: https://issues.apache.org/jira/browse/DRILL-4476
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Sean Hsuan-Yi Chu
>
> Union-All operator does not deal with the situation where left side comes
> from empty source.
> Due to DRILL-2288's enhancement for empty sources, Union-All operator now can
> be allowed to support this scenario.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
