1 files changed, 39 insertions, 0 deletions
diff --git a/db/migrate/20160607185958_add_constrained_trigram_indexes_on_issuables.rb b/db/migrate/20160607185958_add_constrained_trigram_indexes_on_issuables.rb
new file mode 100644
index 00000000000..e733c8b9901
--- /dev/null
+++ b/db/migrate/20160607185958_add_constrained_trigram_indexes_on_issuables.rb
@@ -0,0 +1,39 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddConstrainedTrigramIndexesOnIssuables < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab::Database.postgresql?
+
+    to_index.each do |table, columns|
+      columns.each do |column|
+        remove_index table, name: "index_#{table}_on_#{column}_trigram"
+        execute "CREATE INDEX CONCURRENTLY index_#{table}_on_#{column}_trigram ON #{table} USING gin(#{column} gin_trgm_ops) WHERE deleted_at IS NULL;"
+      end
+    end
+  end
+
+  def down
+    return unless Gitlab::Database.postgresql?
+
+    to_index.each do |table, columns|
+      columns.each do |column|
+        remove_index table, name: "index_#{table}_on_#{column}_trigram"
+        execute "CREATE INDEX CONCURRENTLY index_#{table}_on_#{column}_trigram ON #{table} USING gin(#{column} gin_trgm_ops);"
+      end
+    end
+  end
+
+  def to_index
+    {
+      issues:         [:title, :description],
+      merge_requests: [:title, :description]
+    }
+  end
+end