Marton Bod created HIVE-25754:
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Summary: Fix column projection for union all queries with multiple
aliases
Key: HIVE-25754
URL: https://issues.apache.org/jira/browse/HIVE-25754
Project: Hive
Issue Type: Bug
Reporter: Marton Bod
Assignee: Marton Bod
Given two tables:
{{create table source1 (dt string, d1 int, d2 int) stored as orc;
create table source2 (dt string, d1 int, d2 int) stored as orc;
insert into source1 values ('20211107', 1, 2);
insert into source2 values ('20211108', 11, 22);}}
If you run this query with UNION ALL, the {{key}} column will be missing from
the output:
{{select explode(map('D219', D219
,'D220', D220)) as (key, value) from (}}
{{select '20211107' as date_key
,1 as D219
,2 as D220
) t}}
{{union all}}
{{select explode(map('D221', D221
,'D222', D222)) as (key, value)
from (}}
{{select '20211107' as date_key
,1 as D221
,2 as D222
) t}}
Result:
{{1}}
{{2}}
{{11}}
{{22}}
Correct result should be:
{{D219 1}}
{{D220 2}}
{{D221 11}}
{{D222 22}}
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