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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1490) More implicit type conversion: UNION ALL and COALESCE
Date Mon, 07 Feb 2011 23:32:57 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adam Kramer updated HIVE-1490:
------------------------------

    Issue Type: Bug  (was: Improvement)

Based on http://wiki.apache.org/hadoop/Hive/HiveQL/Types#Implicit_and_Explicit_Type_Conversions
this appears to actually be a bug rather than an improvement.

> 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
>
> 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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