From 4667b20c007c4bce248ac6cc458414fefa058bb8 Mon Sep 17 00:00:00 2001
From: Alexis Reigel <alexis.reigel.ext@siemens.com>
Date: Wed, 6 Feb 2019 20:35:22 +0100
Subject: [PATCH] add trigram database index on tags

---
 db/migrate/20190206193120_add_index_to_tags.rb | 18 ++++++++++++++++++
 db/schema.rb                                   |  1 +
 2 files changed, 19 insertions(+)
 create mode 100644 db/migrate/20190206193120_add_index_to_tags.rb

diff --git a/db/migrate/20190206193120_add_index_to_tags.rb b/db/migrate/20190206193120_add_index_to_tags.rb
new file mode 100644
index 00000000000..5257ebba003
--- /dev/null
+++ b/db/migrate/20190206193120_add_index_to_tags.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class AddIndexToTags < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_tags_on_name_trigram'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :tags, :name, name: INDEX_NAME, using: :gin, opclasses: { name: :gin_trgm_ops }
+  end
+
+  def down
+    remove_concurrent_index_by_name(:tags, INDEX_NAME)
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index a7a83475679..d4166e32112 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -2053,6 +2053,7 @@ ActiveRecord::Schema.define(version: 20190220150130) do
     t.string "name"
     t.integer "taggings_count", default: 0
     t.index ["name"], name: "index_tags_on_name", unique: true, using: :btree
+    t.index ["name"], name: "index_tags_on_name_trigram", using: :gin, opclasses: {"name"=>"gin_trgm_ops"}
   end
 
   create_table "term_agreements", force: :cascade do |t|
-- 
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