Generated HQL for a Count Query with multiple Group By columns not producing valid SQL for MSSQL

Related to #1472

I think the fix introduced a bug. When I do aggregations on any column and add a new group by. It will generate a count query HQL that looks like this:

select count(distinct col1, col2)
// where col1 and col2 are the group by columns.

In MSSQL it will throw an exception as the generated SQL from the HQL is not valid SQL for MSSQL.

The issue has been touched on this hibernate issue:

https://hibernate.atlassian.net/browse/HHH-11042?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&showAll=true

With the result being to implement a dialect specific sql function for sql server that would create valid sql for this use case. The resulting sql would have the following format:

count(distinct coalesce(nullif(coalesce(col1 || '', '\0'), ''), '\01') || '\0' || coalesce(nullif(coalesce(col2 || '', '\0'), ''), '\02'))

Is there any way to do this right now in querydsl (i.e. add your own override count function to the count query)? What do you guys think a good workaround would be?

Thanks,

Gary

[syedammarzia]

Facing this issue. It is a pretty basic issue and should be fixed. Is there any timeline for this? It seems like it is already long overdue.

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