Use the following instructions to replace the standard T-SQL functions with some external, non-T-SQL equivalent functions. You only need to do this if you are having problems (e.g. performance issues) with the standard database views.
dbfhadmin -script -provider:pg -type:datastore_funcs -name:<datastore_name>
By default, the command creates a script file named create_datastore_funcs_<datastore_name>_pg.sql
The external functions replace the currently installed T-SQL ones within your database. Existing views should continue to work, using the new functions.