Khurram Faraaz created DRILL-4185:
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Summary: UNION ALL involving empty directory on any side of union
all results in Failed query
Key: DRILL-4185
URL: https://issues.apache.org/jira/browse/DRILL-4185
Project: Apache Drill
Issue Type: Bug
Components: Execution - Relational Operators
Affects Versions: 1.4.0
Reporter: Khurram Faraaz
UNION ALL query that involves an empty directory on either side of UNION ALL
operator results in FAILED query. We should return the results for the
non-empty side (input) of UNION ALL.
Note that empty_DIR is an empty directory, the directory exists, but it has no
files in it.
Drill 1.4 git.commit.id=b9068117
4 node cluster on CentOS
{code}
0: jdbc:drill:schema=dfs.tmp> select columns[0] from empty_DIR UNION ALL select
cast(columns[0] as int) c1 from `testWindow.csv`;
Error: VALIDATION ERROR: From line 1, column 24 to line 1, column 32: Table
'empty_DIR' not found
[Error Id: 5c024786-6703-4107-8a4a-16c96097be08 on centos-01.qa.lab:31010]
(state=,code=0)
0: jdbc:drill:schema=dfs.tmp> select cast(columns[0] as int) c1 from
`testWindow.csv` UNION ALL select columns[0] from empty_DIR;
Error: VALIDATION ERROR: From line 1, column 90 to line 1, column 98: Table
'empty_DIR' not found
[Error Id: 58c98bc4-99df-425c-aa07-c8c5faec4748 on centos-01.qa.lab:31010]
(state=,code=0)
{code}
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