Cache column_exists? for application settingssh-cache-column-exists

This is most a backport of
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4987/diffs but includes
other columns that use column_exists? in a way that may cause unnecessary
schema loads.

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index e51794fef99..d4fc69cb173 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -183,6 +183,10 @@ module Gitlab
       ActiveRecord::Base.connection
     end
 
+    def self.cached_column_exists?(table_name, column_name)
+      connection.schema_cache.columns_hash(table_name).has_key?(column_name.to_s)
+    end
+
     private_class_method :connection
 
     def self.database_version