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  1. Apache Drill
  2. DRILL-4476

Enhance Union-All operator for dealing with empty left input or empty both inputs

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      Description

      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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              • Assignee:
                seanhychu Sean Hsuan-Yi Chu
                Reporter:
                seanhychu Sean Hsuan-Yi Chu
                Reviewer:
                Khurram Faraaz
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                  Updated:
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