Rename *_for_postgresql migration helpers

We do not support other database anymore, so `_for_postgresql` notion is
redundant.

See https://gitlab.com/gitlab-org/gitlab/-/issues/328261.

db/migrate/20210311120153_initialize_conversion_of_events_id_to_bigint.rb

@@ -14,7 +14,7 @@ class InitializeConversionOfEventsIdToBigint < ActiveRecord::Migration[6.0]
   def down
     trigger_name = rename_trigger_name(:events, :id, :id_convert_to_bigint)
 
-    remove_rename_triggers_for_postgresql :events, trigger_name
+    remove_rename_triggers :events, trigger_name
 
     remove_column :events, :id_convert_to_bigint
   end

db/migrate/20210311120154_initialize_conversion_of_push_event_payloads_event_id_to_bigint.rb

@@ -14,7 +14,7 @@ class InitializeConversionOfPushEventPayloadsEventIdToBigint < ActiveRecord::Mig
   def down
     trigger_name = rename_trigger_name(:push_event_payloads, :event_id, :event_id_convert_to_bigint)
 
-    remove_rename_triggers_for_postgresql :push_event_payloads, trigger_name
+    remove_rename_triggers :push_event_payloads, trigger_name
 
     remove_column :push_event_payloads, :event_id_convert_to_bigint
   end

db/migrate/20210415100159_initialize_conversion_of_ci_build_needs_to_bigint.rb

@@ -10,7 +10,7 @@ class InitializeConversionOfCiBuildNeedsToBigint < ActiveRecord::Migration[6.0]
   def down
     trigger_name = rename_trigger_name(:ci_build_needs, :build_id, :build_id_convert_to_bigint)
 
-    remove_rename_triggers_for_postgresql :ci_build_needs, trigger_name
+    remove_rename_triggers :ci_build_needs, trigger_name
 
     remove_column :ci_build_needs, :build_id_convert_to_bigint
   end

db/migrate/20210420120734_initialize_conversion_of_ci_job_artifacts_to_bigint.rb

@@ -13,7 +13,7 @@ class InitializeConversionOfCiJobArtifactsToBigint < ActiveRecord::Migration[6.0
 
   def down
     trigger_name = rename_trigger_name(TABLE, COLUMNS, TARGET_COLUMNS)
-    remove_rename_triggers_for_postgresql TABLE, trigger_name
+    remove_rename_triggers TABLE, trigger_name
 
     TARGET_COLUMNS.each do |column|
       remove_column TABLE, column

db/migrate/20210422022825_initialize_conversion_of_ci_sources_pipelines_source_job_id_to_bigint.rb

@@ -11,7 +11,7 @@ class InitializeConversionOfCiSourcesPipelinesSourceJobIdToBigint < ActiveRecord
   def down
     trigger_name = rename_trigger_name(:ci_sources_pipelines, :source_job_id, :source_job_id_convert_to_bigint)
 
-    remove_rename_triggers_for_postgresql :ci_sources_pipelines, trigger_name
+    remove_rename_triggers :ci_sources_pipelines, trigger_name
 
     remove_column :ci_sources_pipelines, :source_job_id_convert_to_bigint
   end

lib/gitlab/database/migration_helpers.rb

@@ -565,7 +565,7 @@ module Gitlab
 
         check_trigger_permissions!(table)
 
-        remove_rename_triggers_for_postgresql(table, trigger_name)
+        remove_rename_triggers(table, trigger_name)
 
         remove_column(table, new)
       end
@@ -576,8 +576,19 @@ module Gitlab
       # table - The name of the table to install the trigger in.
       # old_column - The name of the old column.
       # new_column - The name of the new column.
-      def install_rename_triggers(table, old_column, new_column)
-        install_rename_triggers_for_postgresql(table, old_column, new_column)
+      # trigger_name - The name of the trigger to use (optional).
+      def install_rename_triggers(table, old, new, trigger_name: nil)
+        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).create(old, new, trigger_name: trigger_name)
+      end
+
+      # Removes the triggers used for renaming a column concurrently.
+      def remove_rename_triggers(table, trigger)
+        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).drop(trigger)
+      end
+
+      # Returns the (base) name to use for triggers when renaming columns.
+      def rename_trigger_name(table, old, new)
+        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).name(old, new)
       end
 
       # Changes the type of a column concurrently.
@@ -690,7 +701,7 @@ module Gitlab
 
         check_trigger_permissions!(table)
 
-        remove_rename_triggers_for_postgresql(table, trigger_name)
+        remove_rename_triggers(table, trigger_name)
 
         remove_column(table, old)
       end
@@ -982,7 +993,7 @@ module Gitlab
         temporary_columns = columns.map { |column| convert_to_bigint_column(column) }
 
         trigger_name = rename_trigger_name(table, columns, temporary_columns)
-        remove_rename_triggers_for_postgresql(table, trigger_name)
+        remove_rename_triggers(table, trigger_name)
 
         temporary_columns.each { |column| remove_column(table, column) }
       end
@@ -1079,21 +1090,6 @@ module Gitlab
         execute("DELETE FROM batched_background_migrations WHERE #{conditions}")
       end
 
-      # Performs a concurrent column rename when using PostgreSQL.
-      def install_rename_triggers_for_postgresql(table, old, new, trigger_name: nil)
-        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).create(old, new, trigger_name: trigger_name)
-      end
-
-      # Removes the triggers used for renaming a PostgreSQL column concurrently.
-      def remove_rename_triggers_for_postgresql(table, trigger)
-        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).drop(trigger)
-      end
-
-      # Returns the (base) name to use for triggers when renaming columns.
-      def rename_trigger_name(table, old, new)
-        Gitlab::Database::UnidirectionalCopyTrigger.on_table(table).name(old, new)
-      end
-
       # Returns an Array containing the indexes for the given column
       def indexes_for(table, column)
         column = column.to_s

spec/lib/gitlab/database/migration_helpers_spec.rb

@@ -835,7 +835,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
         it 'renames a column concurrently' do
           expect(model).to receive(:check_trigger_permissions!).with(:users)
 
-          expect(model).to receive(:install_rename_triggers_for_postgresql)
+          expect(model).to receive(:install_rename_triggers)
             .with(:users, :old, :new)
 
           expect(model).to receive(:add_column)
@@ -947,7 +947,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
     it 'reverses the operations of rename_column_concurrently' do
       expect(model).to receive(:check_trigger_permissions!).with(:users)
 
-      expect(model).to receive(:remove_rename_triggers_for_postgresql)
+      expect(model).to receive(:remove_rename_triggers)
         .with(:users, /trigger_.{12}/)
 
       expect(model).to receive(:remove_column).with(:users, :new)
@@ -960,7 +960,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
     it 'cleans up the renaming procedure' do
       expect(model).to receive(:check_trigger_permissions!).with(:users)
 
-      expect(model).to receive(:remove_rename_triggers_for_postgresql)
+      expect(model).to receive(:remove_rename_triggers)
         .with(:users, /trigger_.{12}/)
 
       expect(model).to receive(:remove_column).with(:users, :old)
@@ -1000,7 +1000,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
       it 'reverses the operations of cleanup_concurrent_column_rename' do
         expect(model).to receive(:check_trigger_permissions!).with(:users)
 
-        expect(model).to receive(:install_rename_triggers_for_postgresql)
+        expect(model).to receive(:install_rename_triggers)
           .with(:users, :old, :new)
 
         expect(model).to receive(:add_column)
@@ -1095,7 +1095,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
     it 'reverses the operations of change_column_type_concurrently' do
       expect(model).to receive(:check_trigger_permissions!).with(:users)
 
-      expect(model).to receive(:remove_rename_triggers_for_postgresql)
+      expect(model).to receive(:remove_rename_triggers)
         .with(:users, /trigger_.{12}/)
 
       expect(model).to receive(:remove_column).with(:users, "old_for_type_change")
@@ -1160,7 +1160,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
         expect(model).to receive(:rename_column)
           .with(:users, temp_undo_cleanup_column, :old)
 
-        expect(model).to receive(:install_rename_triggers_for_postgresql)
+        expect(model).to receive(:install_rename_triggers)
           .with(:users, :old, 'old_for_type_change')
 
         model.undo_cleanup_concurrent_column_type_change(:users, :old, :string)
@@ -1186,7 +1186,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
         expect(model).to receive(:rename_column)
           .with(:users, temp_undo_cleanup_column, :old)
 
-        expect(model).to receive(:install_rename_triggers_for_postgresql)
+        expect(model).to receive(:install_rename_triggers)
           .with(:users, :old, 'old_for_type_change')
 
         model.undo_cleanup_concurrent_column_type_change(
@@ -1207,8 +1207,8 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
     end
   end
 
-  describe '#install_rename_triggers_for_postgresql' do
-    it 'installs the triggers for PostgreSQL' do
+  describe '#install_rename_triggers' do
+    it 'installs the triggers' do
       copy_trigger = double('copy trigger')
 
       expect(Gitlab::Database::UnidirectionalCopyTrigger).to receive(:on_table)
@@ -1216,11 +1216,11 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
 
       expect(copy_trigger).to receive(:create).with(:old, :new, trigger_name: 'foo')
 
-      model.install_rename_triggers_for_postgresql(:users, :old, :new, trigger_name: 'foo')
+      model.install_rename_triggers(:users, :old, :new, trigger_name: 'foo')
     end
   end
 
-  describe '#remove_rename_triggers_for_postgresql' do
+  describe '#remove_rename_triggers' do
     it 'removes the function and trigger' do
       copy_trigger = double('copy trigger')
 
@@ -1229,7 +1229,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
 
       expect(copy_trigger).to receive(:drop).with('foo')
 
-      model.remove_rename_triggers_for_postgresql('bar', 'foo')
+      model.remove_rename_triggers('bar', 'foo')
     end
   end