[release/7.0] Fix split query over GroupBy over parameter (#30024) #30030
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Fixes #30022, backports #30024
Description
A bug in split query handling results in an incorrect SQL query tree.
Customer impact
Valid LINQ queries involving split queries and GroupBy which worked in EF Core 6.0 throw NullReferenceException in 7.0.
How found
Customer report on 7.0.
Regression
Yes, from 6.0.
Testing
Added tests for the affected scenario.
Risk
Very low; the bug is very obvious and the fix is a one-liner.