How to get new (FB 3) advanced plan output in your application

Martijn Tonies wrote:

I wonder, how can applications use this feature (i.e. how to get it, without using isql).

Vlad Khorsun answers:

Pass isc_info_sql_explain_plan (value 26) into isc_dsql_info() instead of isc_info_sql_get_plan (value 22).