Add specific index names

This is useful to distinguish any other indexes on the same columns but
with different conditions and/or sorting.

db/migrate/20181119132520_add_indexes_to_ci_builds_and_pipelines.rb

@@ -8,12 +8,37 @@ class AddIndexesToCiBuildsAndPipelines < ActiveRecord::Migration
   disable_ddl_transaction!
 
   def up
-    add_concurrent_index :ci_pipelines, [:project_id, :ref, :id], order: { id: :desc }
-    add_concurrent_index :ci_builds, [:commit_id, :artifacts_expire_at, :id], where: "type = 'Ci::Build' AND (retried = false OR retried IS NULL) AND name IN ('sast', 'dependency_scanning', 'sast:container', 'container_scanning', 'dast')"
+    indexes.each do |index|
+      add_concurrent_index(*index)
+    end
   end
 
   def down
-    remove_concurrent_index :ci_pipelines, [:project_id, :ref, :id], order: { id: :desc }
-    remove_concurrent_index :ci_builds, [:commit_id, :artifacts_expire_at, :id], where: "type = 'Ci::Build' AND (retried = false OR retried IS NULL) AND name IN ('sast', 'dependency_scanning', 'sast:container', 'container_scanning', 'dast')"
+    indexes.each do |index|
+      remove_concurrent_index(*index)
+    end
+  end
+
+  private
+
+  def indexes
+    [
+      [
+        :ci_pipelines,
+        [:project_id, :ref, :id],
+        {
+          order: { id: :desc },
+          name: 'index_ci_pipelines_on_project_idandrefandiddesc'
+        }
+      ],
+      [
+        :ci_builds,
+        [:commit_id, :artifacts_expire_at, :id],
+        {
+          where: "type::text = 'Ci::Build'::text AND (retried = false OR retried IS NULL) AND (name::text = ANY (ARRAY['sast'::character varying, 'dependency_scanning'::character varying, 'sast:container'::character varying, 'container_scanning'::character varying, 'dast'::character varying]::text[]))",
+          name: 'index_ci_builds_on_commit_id_and_artifacts_expireatandidpartial'
+        }
+      ]
+    ]
   end
 end

db/schema.rb

@@ -349,7 +349,7 @@ ActiveRecord::Schema.define(version: 20181219145520) do
     t.string "token_encrypted"
     t.index ["artifacts_expire_at"], name: "index_ci_builds_on_artifacts_expire_at", where: "(artifacts_file <> ''::text)", using: :btree
     t.index ["auto_canceled_by_id"], name: "index_ci_builds_on_auto_canceled_by_id", using: :btree
-    t.index ["commit_id", "artifacts_expire_at", "id"], name: "index_ci_builds_on_commit_id_and_artifacts_expire_at_and_id", where: "(((type)::text = 'Ci::Build'::text) AND ((retried = false) OR (retried IS NULL)) AND ((name)::text = ANY ((ARRAY['sast'::character varying, 'dependency_scanning'::character varying, 'sast:container'::character varying, 'container_scanning'::character varying, 'dast'::character varying])::text[])))", using: :btree
+    t.index ["commit_id", "artifacts_expire_at", "id"], name: "index_ci_builds_on_commit_id_and_artifacts_expireatandidpartial", where: "(((type)::text = 'Ci::Build'::text) AND ((retried = false) OR (retried IS NULL)) AND ((name)::text = ANY (ARRAY[('sast'::character varying)::text, ('dependency_scanning'::character varying)::text, ('sast:container'::character varying)::text, ('container_scanning'::character varying)::text, ('dast'::character varying)::text])))", using: :btree
     t.index ["commit_id", "stage_idx", "created_at"], name: "index_ci_builds_on_commit_id_and_stage_idx_and_created_at", using: :btree
     t.index ["commit_id", "status", "type"], name: "index_ci_builds_on_commit_id_and_status_and_type", using: :btree
     t.index ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref", using: :btree
@@ -484,7 +484,7 @@ ActiveRecord::Schema.define(version: 20181219145520) do
     t.index ["merge_request_id"], name: "index_ci_pipelines_on_merge_request_id", where: "(merge_request_id IS NOT NULL)", using: :btree
     t.index ["pipeline_schedule_id"], name: "index_ci_pipelines_on_pipeline_schedule_id", using: :btree
     t.index ["project_id", "iid"], name: "index_ci_pipelines_on_project_id_and_iid", unique: true, where: "(iid IS NOT NULL)", using: :btree
-    t.index ["project_id", "ref", "id"], name: "index_ci_pipelines_on_project_id_and_ref_and_id", order: { id: :desc }, using: :btree
+    t.index ["project_id", "ref", "id"], name: "index_ci_pipelines_on_project_idandrefandiddesc", order: { id: :desc }, using: :btree
     t.index ["project_id", "ref", "status", "id"], name: "index_ci_pipelines_on_project_id_and_ref_and_status_and_id", using: :btree
     t.index ["project_id", "sha"], name: "index_ci_pipelines_on_project_id_and_sha", using: :btree
     t.index ["project_id", "source"], name: "index_ci_pipelines_on_project_id_and_source", using: :btree