This fixes a parsing error with parsing E0. The issue is that 0 is a different token from other numbers. This is because sometimes a 0 changes the syntax rules. This changed it so that NULL could be used in a data input prefix as well.
Fixes #551
Checklist
[x] I have performed a self-review of my own code
[x] I have added tests that prove my fix is effective or that my feature works (if applicable)
Description
This fixes a parsing error with parsing
E0. The issue is that0is a different token from other numbers. This is because sometimes a0changes the syntax rules. This changed it so thatNULLcould be used in a data input prefix as well.Fixes #551
Checklist