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Posted to dev@hive.apache.org by "Jason Dere (JIRA)" <ji...@apache.org> on 2013/11/15 03:27:23 UTC
[jira] [Updated] (HIVE-5825) Case statement type checking too
restrictive for parameterized types
[ https://issues.apache.org/jira/browse/HIVE-5825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jason Dere updated HIVE-5825:
-----------------------------
Attachment: HIVE-5825.1.patch
Patch attached. case/when UDFs now allow differing types and will determine a common type to use if the types are different.
> Case statement type checking too restrictive for parameterized types
> --------------------------------------------------------------------
>
> Key: HIVE-5825
> URL: https://issues.apache.org/jira/browse/HIVE-5825
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-5825.1.patch
>
>
> explain select
> case when (key = '0') then 123.456BD else 0.0BD end
> from src limit 2
> FAILED: SemanticException [Error 10016]: Line 3:44 Argument type mismatch '0.0BD': The expression after ELSE should have the same type as those after THEN: "decimal(6,3)" is expected but "decimal(1,0)" is found
> The return type checking is too strict and won't allow different decimal types to be returned if they are not the exact same type (precision/scale). There are similar issues with char/varchar length, but even in the general case it seems odd that you wouldn't be able to specify 1 and 0.0 in the same case statement.
> I would propose setting returnOIResolver so that it is able to convert the return values to common type.
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