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https://issues.apache.org/jira/browse/HIVE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13779760#comment-13779760
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Hari Sankar Sivarama Subramaniyan commented on HIVE-5352:
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Would suggest that we document this behavior in
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types
> 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
> Fix For: 0.12.0
>
> Attachments: HIVE-5352.1.patch, HIVE-5352.2.patch, HIVE-5352.3.patch,
> HIVE-5352.4.patch, HIVE-5352.5.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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