-- 存量库：排货规则服务商表增加判断条件 MatchCondition
-- 可重复执行；仅在列不存在时 ADD。
-- 目标表：t_sales_product_allocation_provider

SET @db := DATABASE();

SET @exists := (
  SELECT COUNT(1)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_sales_product_allocation_provider'
    AND COLUMN_NAME = 'MatchCondition'
);
SET @sql := IF(
  @exists = 0,
  'ALTER TABLE `t_sales_product_allocation_provider` ADD COLUMN `MatchCondition` TEXT NULL COMMENT ''排货判断条件（中文公式），空表示全部订单可用'' AFTER `CustomerIds`',
  'SELECT ''MatchCondition already exists'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;