Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/740
I am re-reading through everyone's comments just to make sure I haven't
misjudged all the feedback that I have received so far (thanks to all for
feedback).
> you could also make %define nicks_new_global_field := my_complex_field
That makes somewhat more sense since stellar assignment is := and property
assignment is =
I think I misjudged this one @cestella . I like this for a number of
reasons.
* This is still very simple for the user.
* This is more consistent with the existing assignment construct.
* This makes it far easier to build complex types for a global %define; its
easier to build a Stellar map, than a JSON string where the quotes need escaped
in Stellar.
So the simple case becomes this.
```
%define bootstrap.servers: = node1:6667
```
And the more complex case becomes this.
```
value := { "foo": "bar" }
%define bootstrap.servers := value
```
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