timatbw commented on PR #2742:
URL: https://github.com/apache/solr/pull/2742#issuecomment-2441360783
I've just realised the registration part of this work is not necessary! All
that's really needed is the public modifier changes. I'm going to simplify the
PR down to just that bit.
The reason the registration isn't needed is because you can already achieve
the desired results using the existing mechanism `type:func` which lets you
access the structured json args via local params. So a ValueSourceParser you
might have in your plugin code can be configured this way by pulling values
from the local params accessible in the `FunctionQParser` object, instead of
positional arguments. All you do is declare your json facet like so
```
{ mycalculation:{ type:func, func:myaggregate, myfield:something, mylimit:2
} }
```
then all those key-value params are available inside your implementation of
`ValueSourceParser`
```
@Override
public ValueSource parse(FunctionQParser fp) throws SyntaxError {
if (fp.getLocalParams() != null) {
String fieldName = fp.getLocalParams().get("myfield");
Integer limit = fp.getLocalParams().getInt("mylimit");
return new MyAgg(fieldName, limit);
} else {
return new MyAgg(fp.parseArg(), fp.parseArg());
}
}
```
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