Skip projects filter on merge requests searchjprovazn-search

When searching for merge requests, an additional subquery
is added which by default filters only merge requests which belong
to source or target project user has permission for.

This filter is not needed because more restrictive filter
which checks if user has permission for target project
is used in the query.

So unless a custom projects filter is used by user, it's possible
to skip the default projects filter and speed up the final query.

Related to #40540

2 files changed, 5 insertions, 1 deletions

diff --git a/app/services/search/global_service.rb b/app/services/search/global_service.rb
index ff188102b62..92a32e703af 100644
--- a/app/services/search/global_service.rb
+++ b/app/services/search/global_service.rb
@@ -1,13 +1,16 @@
 module Search
   class GlobalService
     attr_accessor :current_user, :params
+    attr_reader :default_project_filter
 
     def initialize(user, params)
       @current_user, @params = user, params.dup
+      @default_project_filter = true
     end
 
     def execute
-      Gitlab::SearchResults.new(current_user, projects, params[:search])
+      Gitlab::SearchResults.new(current_user, projects, params[:search],
+                                default_project_filter: default_project_filter)
     end
 
     def projects
diff --git a/app/services/search/group_service.rb b/app/services/search/group_service.rb
index 29478e3251f..b4efba68715 100644
--- a/app/services/search/group_service.rb
+++ b/app/services/search/group_service.rb
@@ -5,6 +5,7 @@ module Search
     def initialize(user, group, params)
       super(user, params)
 
+      @default_project_filter = false
       @group = group
     end