Khurram Faraaz created DRILL-3805:
-------------------------------------
Summary: Empty JSON on LHS UNION non empty JSON on RHS must return
results
Key: DRILL-3805
URL: https://issues.apache.org/jira/browse/DRILL-3805
Project: Apache Drill
Issue Type: Improvement
Components: Execution - Relational Operators
Affects Versions: 1.2.0
Reporter: Khurram Faraaz
Assignee: Sean Hsuan-Yi Chu
Priority: Minor
When the input on LHS of UNION operator is empty and there is non empty input
on RHS of Union, we need to return the data from the RHS. Currently we return
SchemaChangeException.
{code}
0: jdbc:drill:schema=dfs.tmp> select key1 from `empty.json` UNION select key1
from `fewRows.json`;
Error: SYSTEM ERROR: SchemaChangeException: The left input of Union-All should
not come from an empty data source
Fragment 0:0
[Error Id: f0fcff87-f470-46a8-9733-316b7da1a87f on centos-02.qa.lab:31010]
(state=,code=0)
{code}
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