Steve Carlin created HIVE-26671:
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Summary: Incorrect results for group by/order by/limit query with
2 aggregates
Key: HIVE-26671
URL: https://issues.apache.org/jira/browse/HIVE-26671
Project: Hive
Issue Type: Bug
Components: Operators
Reporter: Steve Carlin
Grabbed this query from the Impala test suite. It is a query run off of tpcds
tables, but it's not really super special. You will need a lot of data to
reproduce this, though.
select
l_orderkey,
min(l_shipdate) as flt,
count(distinct l_partkey) as cnl
from lineitem
group by l_orderkey order by l_orderkey limit 2;
The issue is with the Top N Key operator optimizer. The Top N Key operator is
the first operator after the Table Scan. The sort key is on both the
l_orderkey and l_partkey columns, but this means that the second sort key might
not be forwarded.
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