Sean Hsuan-Yi Chu created DRILL-4476:
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Summary: 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.
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