Minor Description
There are 5 web_sales references in query95 of tpcds ,with alias ws1-ws5.
But the query plan only has ws1 when CBO is on.
query95 :
SELECT count(distinct ws1.ws_order_number) as order_count,
sum(ws1.ws_ext_ship_cost) as total_shipping_cost,
sum(ws1.ws_net_profit) as total_net_profit
FROM web_sales ws1
JOIN customer_address ca ON (ws1.ws_ship_addr_sk = ca.ca_address_sk)
JOIN web_site s ON (ws1.ws_web_site_sk = s.web_site_sk)
JOIN date_dim d ON (ws1.ws_ship_date_sk = d.d_date_sk)
LEFT SEMI JOIN (SELECT ws2.ws_order_number as ws_order_number
FROM web_sales ws2 JOIN web_sales ws3
ON (ws2.ws_order_number = ws3.ws_order_number)
WHERE ws2.ws_warehouse_sk <> ws3.ws_warehouse_sk
) ws_wh1
ON (ws1.ws_order_number = ws_wh1.ws_order_number)
LEFT SEMI JOIN (SELECT wr_order_number
FROM web_returns wr
JOIN (SELECT ws4.ws_order_number as ws_order_number
FROM web_sales ws4 JOIN web_sales ws5
ON (ws4.ws_order_number = ws5.ws_order_number)
WHERE ws4.ws_warehouse_sk <> ws5.ws_warehouse_sk
) ws_wh2
ON (wr.wr_order_number = ws_wh2.ws_order_number)) tmp1
ON (ws1.ws_order_number = tmp1.wr_order_number)
WHERE d.d_date between '2002-05-01' and '2002-06-30' and
ca.ca_state = 'GA' and
s.web_company_name = 'pri';