Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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None
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None
Description
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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