postgres，更新语句停止

Question

我的查询，

WITH vista AS (
  SELECT
    transaction_id,
    SUM (item_total) AS items_total,
    SUM (item_total) * 0.2 AS discount_value,
    (SUM (item_total) * 0.8) * 0.16 AS tax,
    (SUM (item_total) * 0.8 * 1.16) AS grand_total
  FROM lineitems_vista
  GROUP BY transaction_id
)
UPDATE transactions
SET
  items_total = vista.items_total,
  discount_id = 5,
  discount_value = vista.discount_value,
  tax = vista.tax,
  grand_total = vista.grand_total
FROM vista
WHERE id = transaction_id;

只更新了302行，现在已经持续了大约一个小时。我做错了什么？