Adding 'with' clause support.

Author: AllenInstitute

lib/etl/control/source/database_source.rb

@@ -75,6 +75,11 @@ def order
         configuration[:order]
       end
 
+      # Get the with clause for the query, defaults to nil
+      def with
+        configuration[:with]
+      end
+      
       # Return the column which is used for in the where clause to identify
       # new rows
       def new_records_only
@@ -169,6 +174,8 @@ def write_local(file)
       # Get the query to use
       def query
         return @query if @query
+        q = ''
+        q << "#{with}" if with
         q = "SELECT #{select} FROM #{@table}"
         q << " #{join}" if join