Steve Carlin created HIVE-23206:
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Summary: Project not defined correctly after reordering a join
Key: HIVE-23206
URL: https://issues.apache.org/jira/browse/HIVE-23206
Project: Hive
Issue Type: Bug
Components: CBO
Reporter: Steve Carlin
The following highlighted line seems to be incorrect in the test suite:
[https://github.com/apache/hive/blob/master/ql/src/test/results/clientpositive/perf/tez/cbo_query95.q.out#L89]
Note that the project takes all the columns from the table scan, yet it only
needs a couple of them.
I did some very small debugging on this. When I removed the
applyJoinOrderingTransform here:
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L1897]
... the problem goes away. So presumably one of the rules in there is causing
the problem.
Here is a slightly simplified version of the query which has the same problem
(using the same tpc-ds database):
explain cbo with ws_wh as
(select ws1.ws_order_number
from web_sales ws1,web_returns wr2
where ws1.ws_order_number = wr2.wr_order_number)
select
ws_order_number
from
web_sales ws1
where
ws1.ws_order_number in (select wr_order_number
from web_returns,ws_wh
where wr_order_number = ws_wh.ws_order_number)
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