Application: gvSIG desktop

Here is a patch which solves problems form when you try to create layer from a custom SQL.

In Postgis, custom SQL must return a column as geometry, but, as Postgis-Dal provider use WKB to read it, the final sql must use asBinary function to get geometry data. Now, DAL uses the specified SQL directly (without convert geometry).

The patch changes this behaviour creating the select-SQL as a standard source but using the required query as subquery (on FROM clause).