Implement decision node (0/2)

[sprzedwojski]

When WF functions are ready.

[mik-laj]

I can see that the mapper is already in the repository. Can you expand the description of this issues? The key matter that should be included in the issues include:

• Description of current behavior;
• Description of expected behavior.

[sprzedwojski]

Yes, this issue was created quickly in the past as a reminder - I agree it could be more detailed.

The key thing here is to map the wf:function used as the decision action's condition to the correct Python function from o2a_libs - which will be in the DAG.

Currently in the example we only use the firstNotNull function as a dummy replacement.