LINQ Generating Bad Query, Error Unknown Column (VB.NET MySQL) - mysql

Question

I'm developing in MVC2 using VB.NET and MySQL and ran into a problem trying to convert a simple SQL query to LINQ.
SQL Query:
SELECT Location_Number, sum(Column1) as totalC1, sum(Column2) as totalC2
FROM MyTable
WHERE year = 2010 and month = 8
GROUP BY Location_Number
ORDER BY Location_Number
LINQ Query:
From r In MyTable _
Where r.Year = 2010 And r.Month = 8 _
Group r By LN = r.Location_Number Into l = Group _
Order By LN _
Select New With { _
.Location_Number = LN, _
.DepositCount = l.Sum(Function(r) r.Column1), _
.OtherCount = l.Sum(Function(r) r.Column2) _
}
The error generated is:
An error occurred while executing the command definition. See the inner exception for details.
The inner exception is:
Unknown column 'GroupBy1.K1' in 'field list'
Here is the SQL generated by LINQ:
SELECT `Project1`.`Location_Number`, `Project1`.`C1`, `Project1`.`C2`
FROM (
SELECT `GroupBy1`.`A1` AS `C1`, `GroupBy1`.`A2` AS `C2`, `GroupBy1`.`K1` AS `Location_Number`
FROM (
SELECT Sum(`Column1`) AS `A1`, Sum(`Column2`) AS `A2`
FROM `MyTable` AS `Extent1`
WHERE (`Extent1`.`Year` = #p__linq__0) AND (`Extent1`.`Month` = #p__linq__1)
GROUP BY `Extent1`.`Location_Number`
) AS `GroupBy1`
) AS `Project1`
ORDER BY `Location_Number` ASC
Looking at that query its easy to spot whats causing the error. Simply, the most inner query only returns 2 columns, while the query right above it is trying to SELECT 3, thus the Unknown Column Error. So why is this happening? What is wrong with my LINQ query?
Thank you

Answer 1

It is a MySQL connector bug: http://bugs.mysql.com/bug.php?id=46742
Is not fixed in last (6.3.5) version.

Answer 2

Good news! That bug was fixed on 6.3.7 (see comments in http://bugs.mysql.com/bug.php?id=46742).

Answer 3

Yes, it's a mySQL connector bug.
Try this:
Using context = New YourContext()
Dim sql = "SELECT Location_Number, sum(Column1) as totalC1, sum(Column2) as totalC2 FROM MyTable WHERE year = #YEAR and month = #MONTH GROUP BY Location_Number ORDER BY Location_Number"
Dim args = New DbParameter()
{
New SqlParameter() With {Key .ParameterName = "YEAR", Key .Value = 2010}, New SqlParameter() With {Key .ParameterName = "MONTH", Key .Value = 8}
}
Return context.ExecuteStoreQuery(Of MyTable)(sql, args).ToList()
End Using