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