-- prc_order_bill.pickup_date from TAB_ORDER.PICKUP_DATE
SET NAMES utf8mb4;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_order_bill'
    AND COLUMN_NAME = 'pickup_date'
  LIMIT 1
);
SET @sql := IF(
  @col IS NULL,
  'ALTER TABLE prc_order_bill ADD COLUMN pickup_date datetime DEFAULT NULL COMMENT \'收货时间（TAB_ORDER.PICKUP_DATE）\' AFTER order_time, ADD KEY idx_order_bill_pickup_date (pickup_date)',
  'SELECT 1'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- backfill from prc_order when order_id linked
UPDATE prc_order_bill b
INNER JOIN prc_order o ON o.order_id = b.order_id
SET b.pickup_date = o.pickup_date
WHERE b.pickup_date IS NULL
  AND o.pickup_date IS NOT NULL;