Seaquel
SQL Server error code

SQL Server error 8731

SQL Server raises error 8731 at severity 15, which marks a problem with the query or data that you can correct.

REDISTRIBUTE and REDUCE hints expect the first join condition to be an equality comparison of columns with directly comparable types. Modify the query and re-run it.
Msg8731
Severity15
Group8000–8999

Source: Database Engine events and errors