"not in GROUP BY clause" errors

[herbdool]

In testing I got these errors:

Expression #8 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'lamp.source.id' which is not functionally dependent on columns in GROUP BY clause;

Expression #8 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'lamp.activity_type.label' which is not functionally dependent on columns in GROUP BY clause;

They go away when add them to the GROUP BY in CRM_Activityical_Feed::getData():

GROUP BY civicrm_activity.id, source.id, activity_type.label

ONLY_FULL_GROUP_BY is enabled by default now so the extension should probably fix this.