ambari-server/src/main/resources/Ambari-DDL-Postgres-DROP.sql

--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
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--

CREATE OR REPLACE FUNCTION drop_tables(dbuser text) RETURNS void AS $$
    DECLARE
      table_row pg_catalog.pg_tables%rowtype;
    BEGIN
      FOR table_row IN SELECT
                         *
                       FROM pg_catalog.pg_tables
                       WHERE tableowner = dbuser
      LOOP
        execute 'DROP TABLE IF EXISTS ' || table_row.schemaname || '.' || table_row.tablename || ' CASCADE';
      END LOOP;

    END

$$ LANGUAGE plpgsql;

\set s_username '\'' :username '\''

select drop_tables(:s_username);