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https://issues.apache.org/jira/browse/HIVE-1490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Syed S. Albiz reassigned HIVE-1490:
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Assignee: Syed S. Albiz
> More implicit type conversion: UNION ALL and COALESCE
> -----------------------------------------------------
>
> Key: HIVE-1490
> URL: https://issues.apache.org/jira/browse/HIVE-1490
> Project: Hive
> Issue Type: Bug
> Components: Query Processor, Server Infrastructure
> Reporter: Adam Kramer
> Assignee: Syed S. Albiz
>
> This is a usecase that frequently annoys me:
> SELECT TRANSFORM(stuff)
> USING 'script'
> AS thing1, thing2
> FROM some_table
> UNION ALL
> SELECT a.thing1, a.thing2
> FROM some_other_table a
> ...this fails when a.thing1 and a.thing2 are anything but STRING, because all
> output of TRANSFORM is STRING.
> In this case, a.thing1 and a.thing2 should be implicitly converted to string.
> COALESCE(a.thing1, a.thing2, a.thing3) should similarly do implicit type
> conversion among the arguments. If two are INT and one is BIGINT, upgrade the
> INTs, etc.
> At the very least, it would be nice to have syntax like
> SELECT TRANSFORM(stuff)
> USING 'script'
> AS thing1 INT, thing2 INT
> ...which would effectively cast the output column to the specified type. But
> really, type conversion should work.
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