added sqlite query result and enhanced column generator and value extractor

src/sql/query_intermediates.cpp

@@ -1,6 +1,5 @@
 #include "matador/sql/query_intermediates.hpp"
 #include "matador/sql/session.hpp"
-#include "matador/sql/query_builder.hpp"
 
 namespace matador::sql {
 session &query_intermediate::db()
@@ -20,7 +19,7 @@ query_result<record> query_select_finish::fetch_all()
 
 record query_select_finish::fetch_one()
 {
-  return db().fetch(query().compile()).begin();
+  return *db().fetch(query().compile()).begin().get();
 }
 
 query_intermediate::query_intermediate(session &db, query_builder &query)
@@ -131,8 +130,8 @@ query_execute_where_intermediate query_delete_from_intermediate::where(const bas
   return {db(), query().where(cond)};
 }
 
-query_delete_from_intermediate query_delete_intermediate::from(const std::string &table, const std::string &as)
+query_delete_from_intermediate query_delete_intermediate::from(const std::string &table)
 {
-  return {db(), query().from(table, as)};
+  return {db(), query().from(table)};
 }
 }