[jira] [Commented] (HIVE-3745) Hive does improper "=" based string comparisons for strings with trailing whitespaces

["Harsh J (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-3745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510258#comment-13510258 ] 

Harsh J commented on HIVE-3745:
-------------------------------

My colleague, [~esteban], pointed out that the SQL92 standard (http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt, 8.2  <comparison predicate>) qualifies this thought and that Hive does have a bug.
                
> Hive does improper "=" based string comparisons for strings with trailing whitespaces
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-3745
>                 URL: https://issues.apache.org/jira/browse/HIVE-3745
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 0.9.0
>            Reporter: Harsh J
>
> Compared to other systems such as DB2, MySQL, etc., which disregard trailing whitespaces in a string used when comparing two strings with the "{{=}}" relational operator, Hive does not do this.
> For example, note the following line from the MySQL manual: http://dev.mysql.com/doc/refman/5.1/en/char.html
> {quote}
> All MySQL collations are of type PADSPACE. This means that all CHAR and VARCHAR values in MySQL are compared without regard to any trailing spaces. 
> {quote}
> Hive still is whitespace sensitive and regards trailing spaces of a string as worthy elements when comparing. Ideally {{LIKE}} should consider this strongly, but {{=}} should not.
> Is there a specific reason behind this difference of implementation in Hive's SQL?

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