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https://issues.apache.org/jira/browse/HIVE-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phabricator updated HIVE-2901:
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Attachment: HIVE-2901.D2541.3.patch
navis updated the revision "HIVE-2901 [jira] Hive union with NULL constant and
string in same column returns all null".
Reviewers: JIRA
1. For union all, common type need not to be compared.
REVISION DETAIL
https://reviews.facebook.net/D2541
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java
ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
ql/src/test/queries/clientpositive/union_null.q
ql/src/test/results/clientpositive/union_null.q.out
> Hive union with NULL constant and string in same column returns all null
> ------------------------------------------------------------------------
>
> Key: HIVE-2901
> URL: https://issues.apache.org/jira/browse/HIVE-2901
> Project: Hive
> Issue Type: Bug
> Reporter: Kevin Wilfong
> Assignee: Navis
> Priority: Critical
> Attachments: HIVE-2901.D2541.1.patch, HIVE-2901.D2541.2.patch,
> HIVE-2901.D2541.3.patch
>
>
> 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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