[Fix-1130][metadata]AWS RDS PostGreSQL can't get schema (#1125)

dlink-metadata/dlink-metadata-postgresql/src/main/java/com/dlink/metadata/query/PostgreSqlQuery.java

@@ -28,7 +28,7 @@ package com.dlink.metadata.query;
 public class PostgreSqlQuery extends AbstractDBQuery {
     @Override
     public String schemaAllSql() {
-        return "SELECT \"schema_name\" FROM information_schema.schemata where \"schema_name\" not in ('pg_toast','pg_temp_1','pg_toast_temp_1','pg_catalog','information_schema')";
+        return "SELECT nspname AS \"schema_name\" FROM pg_namespace WHERE nspname NOT LIKE 'pg_%' AND nspname != 'information_schema'";
     }
 
     @Override