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From "Hari Sankar Sivarama Subramaniyan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5352) cast('1.0' as int) returns null
Date Wed, 25 Sep 2013 21:22:03 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13778097#comment-13778097
] 

Hari Sankar Sivarama Subramaniyan commented on HIVE-5352:
---------------------------------------------------------

[~hagleitn] Alright. Thanks for the explanation. The reason I asked that was because between
patch 2 and patch 4, cast('+1e5' as int) turned from a valid casted value to NULL. Another
edge case is when the input terminates with a decimal as in  cast('.' as int) or cast('2.'
as int) the code would return 0 and 2 respectively instead of NULL. We should expect this
behavior with this change and it is not a bug :)
                
> cast('1.0' as int) returns null
> -------------------------------
>
>                 Key: HIVE-5352
>                 URL: https://issues.apache.org/jira/browse/HIVE-5352
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gunther Hagleitner
>            Assignee: Gunther Hagleitner
>         Attachments: HIVE-5352.1.patch, HIVE-5352.2.patch, HIVE-5352.3.patch, HIVE-5352.4.patch
>
>
> Casting strings to int/smallint/bigint/tinyint yields null if the string isn't a 'pure'
integer. '1.0', '2.4' all return null. I think for those cases the cast should return the
truncated int (i.e.: if c is string, cast(c as int) should be the same as cast(cast(c as float)
as int).
> This is in line with the standard and is the same behavior as mysql and oracle. (postgres
and sql server throw error, see first answer here: http://social.msdn.microsoft.com/Forums/sqlserver/en-US/af3eff9c-737b-42fe-9016-05da9203a667/oracle-does-understand-cast10-as-int-why-sql-server-does-not)

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