Selecting just one expression (SELECT 4711;) causes assert failure

[PerHChristensen]

When issuing this query

SELECT 4711;

we get the following stack trace:

"***************** raw plan *************
LogicResult
Output: 4711

***************** optimized plan *************
LogicResult 634
Output: 4711

Memo:
*0: 1, 0, [11903911][NaN]: 4711

Summary: 1,0
Process terminated. Assertion failed.
at qpmodel.optimizer.CMemoGroup.CalculateMinInclusiveCostMember() in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\optimizer.cs:line 367
at qpmodel.optimizer.CMemoGroup.CopyOutMinLogicPhysicPlan() in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\optimizer.cs:line 427
at qpmodel.optimizer.Optimizer.CopyOutOnePlan(SQLStatement stmt, Memo memo) in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\optimizer.cs:line 681
at qpmodel.optimizer.Optimizer.CopyOutOptimalPlan(SQLStatement stmt, Boolean dequeueit) in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\optimizer.cs:line 707
at qpmodel.optimizer.Optimizer.CopyOutOptimalPlan() in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\optimizer.cs:line 717
at qpmodel.Program.Main(String[] args) in C:\Users\pchriste\Source\Repos\qpmodel\qpmodel\Program.cs:line 223

"

[PerHChristensen]

When "select 4711" is executed like this

sql = "select 4711";
TU.ExecuteSQL(sql, "4711");

as a unit test this test passes.

But if it is executed from "line 168" in Program.cs we get the exception.

[zhouqingqing]

that's because by default MEMO is off and program.cs happen to enabled it.