cw_comparable_format_bigint_t.sqlx

config { hasOutput: true }
/*
 * Copyright 2022 Google LLC
 *
 * Licensed 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
 * limitations under the License.
 */

/* Lexicographically '+' comes before '-' so we replace p(lus) and m(inus) and subtract LONG_MIN on negative values */
CREATE OR REPLACE FUNCTION ${self()}(part INT64) RETURNS STRING
AS (
    FORMAT(
      CASE WHEN part < 0 THEN 'm' ELSE 'p' END || '%19d', -- 'm' < 'p' lexicographically
      CASE WHEN part < 0 THEN part + 9223372036854775807 + 1 ELSE part END -- negative numbers need to compare magnitude backwards
    )
);