Hive union with NULL constant and string in same column returns all null
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Key: HIVE-2901
URL: https://issues.apache.org/jira/browse/HIVE-2901
Project: Hive
Issue Type: Bug
Reporter: Kevin Wilfong
Priority: Critical
select x from (select value as x from src union all select NULL as x from src)a;
This query produces all nulls, where value is a string column.
Notably,
select x from (select key as x from src union all select NULL as x from src)a;
where key is a string, but can be cast to a double, the query returns correct
results.
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