[MCOL-4638] count distinct in a join asserts in Ubuntu 20.04 Created: 2021-03-25  Updated: 2021-05-03  Resolved: 2021-04-20

Status: Closed
Project: MariaDB ColumnStore
Component/s: ExeMgr
Affects Version/s: 5.5.1
Fix Version/s: 5.6.1

Type: Bug Priority: Blocker
Reporter: David Hall (Inactive) Assignee: Daniel Lee (Inactive)
Resolution: Fixed Votes: 0
Labels: regression
Environment:

Ubuntu 20.04

Sprint: 2021-5, 2021-6, 2021-7

 Description   

The following query has a count(distinct) followed by statistics aggregates in a join. This will cause an assert in Ubuntu 20.04.

select 'q34', l_shipmode, count(distinct l_orderkey), std(l_partkey*10), stddev(l_partkey*10), stddev_pop(l_partkey*10) from lineitem, part where l_orderkey > 1220 and l_orderkey < 1260 and l_partkey = p_partkey group by 1,2 order by 1,2;
 
ERROR 1815 (HY000): Internal error: Lost connection to ExeMgr. Please contact your administrator



 Comments   
Comment by Daniel Lee (Inactive) [ 2021-04-20 ]

Build verified: 5.6.1 ( Drone #2207)

My understanding is that this issue happens intermittently. I verified the test case, as well as executed the all MTR regression test suites.

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