Harsh J created HIVE-3745:
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Summary: Hive does improper "=" based string comparisons 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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