add optional params to predict function

src/pg/sql/21_gwr.sql

@@ -21,7 +21,9 @@ $$ LANGUAGE plpythonu;
 CREATE OR REPLACE FUNCTION
 CDB_GWR_Predict(subquery text, dep_var text, ind_vars text[],
                 bw numeric default null, fixed boolean default False,
-                kernel text default 'bisquare')
+                kernel text default 'bisquare',
+                geom_col text default 'the_geom',
+                id_col text default 'cartodb_id')
 RETURNS table(coeffs JSON, stand_errs JSON, t_vals JSON,
               r_squared numeric, predicted numeric, rowid bigint)
 AS $$
@@ -29,6 +31,6 @@ AS $$
 from crankshaft.regression import GWR
 gwr = GWR()
 
-return gwr.gwr_predict(subquery, dep_var, ind_vars, bw, fixed, kernel)
+return gwr.gwr_predict(subquery, dep_var, ind_vars, bw, fixed, kernel, geom_col, id_col)
 
 $$ LANGUAGE plpythonu;