@Override
    public ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern) throws SQLException {
        String sql = "SELECT " +
                "'' AS FUNCTION_CAT, " +
                "'' AS FUNCTION_SCHEM, " +
                "'' AS FUNCTION_NAME, " +
                "'' AS REMARKS, " +
                "0 AS FUNCTION_TYPE, " +
                "'' AS SPECIFIC_NAME " +
                "LIMIT 0";
        try {
            return connection.createStatement().executeQuery(sql);
        } catch (Exception e) {
            throw ExceptionUtils.toSqlState(e);
        }
    }
Catalog term relates to the top level scale like clusters, something that joins multiple databases
Returns most close term to catalog in ClickHouse which is "cluster".
@return - string "cluster"
jdbc-v2/src/main/java/com/clickhouse/jdbc/metadata/DatabaseMetaDataImpl.java