[Docs] aggLabelFilter details.

edit:
Ok now I'm more confused, aggregates==groups and I'm missing something with templates....

edit:
A terminology issue. "groups" != "aggregates".

Aggregates are not explained (implemented?), leaving a gap in understanding of capabilities and assumption "agg" is talking about "groups" as it's the only feature that seems to match with the information given.

Original post showing my confusion before that realisation:

Google holds no example of anyone having ever used it.

aggLabelFilter (optional) : Same as the cellFilter but can be defined separately for aggregate row labels.

Is this what that means? Not triggered...

columnDefs: [
{
    field: 'agg_field_name', aggLabelFilter: function(data) {
        return 'hello';
    }
},

This doesn't do anything:

columnDefs: [
{
    field: 'normal_field_name', aggLabelFilter: function(data) {
        return 'hello';
    }
},

Doesn't seem to matter where I put it or how I interact with the grouping UI, the function is never called.

Start by tracing the documented aggLabelFilter option and the aggregate/grouping terminology raised in the issue. Compare the two columnDefs examples with the documented behavior, then update the relevant documentation so aggregate rows, label filtering, and the distinction between groups and aggregates are explained clearly. Confirm that the final wording addresses whether aggregates are implemented and when the callback is invoked.