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https://issues.apache.org/jira/browse/HIVE-8488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174151#comment-14174151
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Jason Dere commented on HIVE-8488:
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hash() uses ObjectInspectorUtils.hashCode(), which has special case handling
for Text so that the hashcode matches String.hashCode(). This special case
handling should have been done for char/varchar as well.
Note that fixing this will break existing behavior of hash() for char/varchar.
> hash() doesn't match between string and char/varchar
> ----------------------------------------------------
>
> Key: HIVE-8488
> URL: https://issues.apache.org/jira/browse/HIVE-8488
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
>
> {noformat}
> hive> select * from tab1;
> OK
> val_484 val_484 val_484
> hive> select hash(c1), hash(c2), hash(c3) from tab1;
> OK
> 230901778 1973712113 1973712113
> {noformat}
> This may throw off users expecting string/varchar/char types to be fairly
> interchangeable.
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