Filters out items from being used in an aggregation.
The filter() function refines a WixDataAggregate so that it only
includes items from the aggregate's collection which match the specified
filter criteria.
To create a filter, use the wix-data filter() function.
Filtering using filter() takes place before grouping is performed on the
aggregation. To filter grouped results, use the having() function.
Note: Aggregations can only be used on collections you have created. They cannot be used on Wix App Collections.
The filter to use to filter out items from being used in the aggregation.