postgre function analyser

plugins/dbgate-plugin-postgres/src/backend/Analyser.js

@@ -139,6 +139,7 @@ class Analyser extends DatabaseAnalyser {
         .filter(x => x.object_type == 'FUNCTION')
         .map(func => ({
           objectId: `functions:${func.schema_name}.${func.pure_name}`,
+          createSql: `CREATE FUNCTION "${func.schema_name}"."${func.pure_name}"() RETURNS ${func.data_type} LANGUAGE ${func.language}\nAS\n$$\n${func.definition}\n$$`,
           pureName: func.pure_name,
           schemaName: func.schema_name,
           contentHash: func.hash_code,

plugins/dbgate-plugin-postgres/src/backend/sql/routines.js

@@ -5,6 +5,7 @@ select
   routine_definition as "definition",
   md5(routine_definition) as "hash_code",
   routine_type as "object_type",
+  data_type as "data_type",
   external_language as "language"
 from
   information_schema.routines where routine_schema != 'information_schema' and routine_schema != 'pg_catalog'