Will not run in CAS

[Aceinhole]

Your merge_asof macro is a beautiful piece of SAS code, but I noticed that it employs the use of PROC SQL, PROC SORT, and FIRST/LAST syntax. This means that this will not run in CAS (SAS Viya's in-memory engine).
SAS Viya users need to be aware that this macro will run just fine, but it will cause their data to run inside the workspace server rather than in-memory, which could cause compute delays.