How can i search and compare same field in different projects?

[Alexander Poryvkin]

I need to search and compare some custom fields in 2 different projects which are connected in workflow. Is it possible to do with just adv. search? 

[Nic Brough -Adaptavist-]

Sorry, it's unclear what you're trying to do here, so I can not really give you a clear answer.

As a starting point though, the searches return issues based on criteria, so you can easily run a search for "Issues in project A or Project B" and then include the custom fields in the output.  And you could also add "and custom field = X, Y or Z" to narrow it down more.  The issue navigator allows you to sort by any of the columns.

So, it is possible to do some comparisons, but I think you are looking for more than that.

[Alexander Poryvkin]

I'm looking for the way to make filter which show only issues with different amount of attachments between root and escalated project.

[Nic Brough -Adaptavist-]

Filters are for finding issues, not doing calculations. You'll need to run two filters and compare them