Further remove code branches by database type

We dropped MySQL support and a lot of mysql specific code has been
removed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29608.

This comes in from the other direction and removes any `if postgresql?`
branches.

1 files changed, 5 insertions, 4 deletions

diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index eef63536de4..cbdff0ab060 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -46,6 +46,7 @@ module Gitlab
       end
     end
 
+    # @deprecated
     def self.postgresql?
       adapter_name.casecmp('postgresql').zero?
     end
@@ -79,19 +80,19 @@ module Gitlab
     end
 
     def self.postgresql_9_or_less?
-      postgresql? && version.to_f < 10
+      version.to_f < 10
     end
 
     def self.join_lateral_supported?
-      postgresql? && version.to_f >= 9.3
+      version.to_f >= 9.3
     end
 
     def self.replication_slots_supported?
-      postgresql? && version.to_f >= 9.4
+      version.to_f >= 9.4
     end
 
     def self.postgresql_minimum_supported_version?
-      postgresql? && version.to_f >= 9.6
+      version.to_f >= 9.6
     end
 
     # map some of the function names that changed between PostgreSQL 9 and 10