Drop `code_owner` column from ApprovalMergeRequestRule

changelogs/unreleased/230835-drop-code_owner-column-from-approvalmergerequestrule.yml

+---
+title: Drop code_owner column from approval_merge_request_rules
+merge_request: 40322
+author:
+type: other

db/post_migrate/20200901212304_drop_code_owner_column_from_approval_merge_request_rule.rb

+# frozen_string_literal: true
+
+class DropCodeOwnerColumnFromApprovalMergeRequestRule < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_column :approval_merge_request_rules, :code_owner
+    end
+  end
+
+  def down
+    unless column_exists?(:approval_merge_request_rules, :code_owner)
+      with_lock_retries do
+        add_column :approval_merge_request_rules, :code_owner, :boolean, default: false, null: false
+      end
+    end
+
+    add_concurrent_index(
+      :approval_merge_request_rules,
+      [:merge_request_id, :code_owner, :name],
+      unique: true,
+      where: "code_owner = true AND section IS NULL",
+      name: "approval_rule_name_index_for_code_owners"
+    )
+
+    add_concurrent_index(
+      :approval_merge_request_rules,
+      [:merge_request_id, :code_owner],
+      name: "index_approval_merge_request_rules_1"
+    )
+  end
+end

db/schema_migrations/20200901212304

+6fb93002ffd5c1d1bfff5bea8a99cbbfc7cefefbc450a9d067ee0cfab8d11e9e
\ No newline at end of file

db/structure.sql

@@ -9304,7 +9304,6 @@ CREATE TABLE public.approval_merge_request_rules (
     updated_at timestamp with time zone NOT NULL,
     merge_request_id integer NOT NULL,
     approvals_required smallint DEFAULT 0 NOT NULL,
-    code_owner boolean DEFAULT false NOT NULL,
     name character varying NOT NULL,
     rule_type smallint DEFAULT 1 NOT NULL,
     report_type smallint,
@@ -19049,8 +19048,6 @@ CREATE UNIQUE INDEX any_approver_project_rule_type_unique_index ON public.approv
 
 CREATE INDEX approval_mr_rule_index_merge_request_id ON public.approval_merge_request_rules USING btree (merge_request_id);
 
-CREATE UNIQUE INDEX approval_rule_name_index_for_code_owners ON public.approval_merge_request_rules USING btree (merge_request_id, code_owner, name) WHERE ((code_owner = true) AND (section IS NULL));
-
 CREATE UNIQUE INDEX backup_labels_group_id_project_id_title_idx ON public.backup_labels USING btree (group_id, project_id, title);
 
 CREATE INDEX backup_labels_group_id_title_idx ON public.backup_labels USING btree (group_id, title) WHERE (project_id = NULL::integer);
@@ -19223,8 +19220,6 @@ CREATE UNIQUE INDEX index_approval_merge_request_rule_sources_1 ON public.approv
 
 CREATE INDEX index_approval_merge_request_rule_sources_2 ON public.approval_merge_request_rule_sources USING btree (approval_project_rule_id);
 
-CREATE INDEX index_approval_merge_request_rules_1 ON public.approval_merge_request_rules USING btree (merge_request_id, code_owner);
-
 CREATE UNIQUE INDEX index_approval_merge_request_rules_approved_approvers_1 ON public.approval_merge_request_rules_approved_approvers USING btree (approval_merge_request_rule_id, user_id);
 
 CREATE INDEX index_approval_merge_request_rules_approved_approvers_2 ON public.approval_merge_request_rules_approved_approvers USING btree (user_id);