[CBRD-24975] Remove date and time related modifier from dblink query #4623
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http://jira.cubrid.org/browse/CBRD-24975
In the process of rewriting a dblink query, a modifier may be added like as the format of datetime 'YYYY-MM-DD hh:mm:ss' while performing constant folding of functions related to time and date, such as to_datetime. However, since these modifiers may not work in other DBMS other than CUBRID, it must avoid adding modifiers when rewriting queries.