I try to execute such query:
SELECT if(isFinite(toUInt64OrZero(toNullable('123'))), 1, 0)

But it throws an exception:

Code: 44, e.displayText() = DB::Exception: Illegal column Const(Nullable(UInt8)) of first argument of function if. Must be ColumnUInt8 or ColumnConstUInt8. (version 20.3.8.53 (official build))

SELECT toTypeName(isFinite(toUInt64OrZero(toNullable('123')))) - Nullable(UInt8)