xjoin - how to get count of rows before geting data?

[arczas89]

trafficstars

Example:

/api/xjoin?_join=pl.productlines,_j,pr.products&_on1=(pl.productline,eq,pr.productline)&_fields=pl.field1,pr.field2

I need real count of rows in database returned by this query. (without geting data). It is possible? I need this to make pagination.

[o1lab]

Count of xjoin rows - is not possible.