[CBRD-24938] add comment to dblink query for statement type checking in gateway #4591
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http://jira.cubrid.org/browse/CBRD-24938
When the gateway checks whether the current query format is SELECT or DML, an error may occur because string parsing is being performed.
So, when sending a query to the gateway, if it puts a comment such as /* DBLINK SELECT */ in front of the query and send it, the gateway can easily determine whether the query is a SELECT statement or a DML statement.