Oracle: datetime type casting problem
-------------------------------------

                 Key: JRUBY-2312
                 URL: http://jira.codehaus.org/browse/JRUBY-2312
             Project: JRuby
          Issue Type: Bug
          Components: ActiveRecord-JDBC
    Affects Versions: JRuby 1.1RC3
         Environment: Activerecord-JDBC 0.8.0 / 0.7.2 ,  JRuby 1.1RC3 / 1.1RC2
            Reporter: Jesse Hu


Data of the four types including "date", "time", "datetime", "timestamp" in 
Rails are stored in Oracle as the DATE type. When retrieving a "datetime" type 
data whose time part is zero from Oracle (that means its hour, minute and 
second attributes equal to 0), it will be converted to a Date rather than a 
Time, then operations on a Date (supposed to be a Time) may conduct to 
"undefined method min()" error such as the datetime_helper functions. 

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