Skip to:

  1. Skip to Jira Navigation
  2. Skip to Side Navigation
  3. Skip to Main Content

Linq group counting does not work

Description

Following query does not work:

It produces following sql:

Which is semantically identical to following linq query:

But it should work as count distinct

Environment

None

Activity

Thomas-Louis Simard 
April 30, 2017 at 4:01 PM

Try this as a workaround :

Frédéric Delaporte 
March 4, 2017 at 6:48 PM

The Distinct().Count() workaround fails with multiple grouping key. It looks like we have no workaround for this case.

Fails with NotSupportedException: new <>f__AnonymousType4`2(ShippingDate = [100001].ShippingDate, ShippedTo = [100001].ShippedTo)
(Seems to be the type name put as the exception message. Fails at VisitExpression, at VisitNhDistinct in HqlGeneratorExpressionTreeVisitor.)

Indeed, this would require a sub query in the from statement, which is unsupported by HQL as far as I know.

This would imply below query can not be supported:

I wonder then if NHibernate should really try to translate the "unique grouping key then count" case to a "distinct then count", as the more general group by case would still fails.

Frédéric Delaporte 
March 4, 2017 at 6:19 PM
(edited)

Following query, tried as a workaround, fails too:

It issues:

This means this bug likely affects all aggregates.

Bilal Fazlani 
July 10, 2014 at 10:27 AM

Hi,
Is this issue fixed?, or anyone working on it ?

Alex Zaytsev 
February 23, 2013 at 10:52 PM

he said:

"The latest version does not support this feature, and hope to see this feature as soon as possible!
NHibernate team, refuel!"

Details

Assignee

Reporter

Labels

Components

Affects versions

Priority

Who's Looking?

Open Who's Looking?
Created May 20, 2012 at 6:15 AM
Updated April 30, 2017 at 4:01 PM
Who's Looking?