Revert "Merge branch 'ab/partition-management' into 'master'"

This reverts merge request !34504

changelogs/unreleased/ab-partition-management.yml

----
-title: Create time-space partitions in separate schema
-merge_request: 34504
-author:
-type: other

config/initializers/active_record_schema_ignore_tables.rb

 # Ignore table used temporarily in background migration
 ActiveRecord::SchemaDumper.ignore_tables = ["untracked_files_for_uploads"]
-
-# Ignore dynamically managed partitions in static application schema
-ActiveRecord::SchemaDumper.ignore_tables += ["partitions_dynamic.*"]

db/migrate/20200615101135_create_dynamic_partitions_schema.rb

-# frozen_string_literal: true
-
-class CreateDynamicPartitionsSchema < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::SchemaHelpers
-
-  DOWNTIME = false
-
-  def up
-    execute 'CREATE SCHEMA partitions_dynamic'
-
-    create_comment(:schema, :partitions_dynamic, <<~EOS.strip)
-      Schema to hold partitions managed dynamically from the application, e.g. for time space partitioning.
-    EOS
-  end
-
-  def down
-    execute 'DROP SCHEMA partitions_dynamic'
-  end
-end

db/structure.sql

 SET search_path=public;
 
-CREATE SCHEMA partitions_dynamic;
-
-COMMENT ON SCHEMA partitions_dynamic IS 'Schema to hold partitions managed dynamically from the application, e.g. for time space partitioning.';
-
 CREATE EXTENSION IF NOT EXISTS pg_trgm WITH SCHEMA public;
 
 CREATE TABLE public.abuse_reports (
@@ -14068,7 +14064,6 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200610130002
 20200613104045
 20200615083635
-20200615101135
 20200615121217
 20200615123055
 20200615232735

lib/gitlab/database/partitioning_migration_helpers/table_management_helpers.rb

@@ -8,7 +8,6 @@ module Gitlab
 
         WHITELISTED_TABLES = %w[audit_events].freeze
         ERROR_SCOPE = 'table partitioning'
-        DYNAMIC_PARTITIONS_SCHEMA = 'partitions_dynamic'
 
         # Creates a partitioned copy of an existing table, using a RANGE partitioning strategy on a timestamp column.
         # One partition is created per month between the given `min_date` and `max_date`.
@@ -126,7 +125,7 @@ module Gitlab
           min_date = min_date.beginning_of_month.to_date
           max_date = max_date.next_month.beginning_of_month.to_date
 
-          create_range_partition_safely("#{table_name}_000000", table_name, 'MINVALUE', to_sql_date_literal(min_date), schema: DYNAMIC_PARTITIONS_SCHEMA)
+          create_range_partition_safely("#{table_name}_000000", table_name, 'MINVALUE', to_sql_date_literal(min_date))
 
           while min_date < max_date
             partition_name = "#{table_name}_#{min_date.strftime('%Y%m')}"
@@ -134,7 +133,7 @@ module Gitlab
             lower_bound = to_sql_date_literal(min_date)
             upper_bound = to_sql_date_literal(next_date)
 
-            create_range_partition_safely(partition_name, table_name, lower_bound, upper_bound, schema: DYNAMIC_PARTITIONS_SCHEMA)
+            create_range_partition_safely(partition_name, table_name, lower_bound, upper_bound)
             min_date = next_date
           end
         end
@@ -143,8 +142,8 @@ module Gitlab
           connection.quote(date.strftime('%Y-%m-%d'))
         end
 
-        def create_range_partition_safely(partition_name, table_name, lower_bound, upper_bound, schema:)
-          if table_exists?("#{schema}.#{partition_name}")
+        def create_range_partition_safely(partition_name, table_name, lower_bound, upper_bound)
+          if table_exists?(partition_name)
             # rubocop:disable Gitlab/RailsLogger
             Rails.logger.warn "Partition not created because it already exists" \
               " (this may be due to an aborted migration or similar): partition_name: #{partition_name}"
@@ -152,7 +151,7 @@ module Gitlab
             return
           end
 
-          create_range_partition(partition_name, table_name, lower_bound, upper_bound, schema: schema)
+          create_range_partition(partition_name, table_name, lower_bound, upper_bound)
         end
 
         def create_sync_trigger(source_table, target_table, unique_key)

lib/gitlab/database/schema_helpers.rb

@@ -69,11 +69,9 @@ module Gitlab
 
       private
 
-      def create_range_partition(partition_name, table_name, lower_bound, upper_bound, schema:)
-        raise ArgumentError, 'explicit schema is required but currently missing' unless schema
-
+      def create_range_partition(partition_name, table_name, lower_bound, upper_bound)
         execute(<<~SQL)
-          CREATE TABLE #{schema}.#{partition_name} PARTITION OF #{table_name}
+          CREATE TABLE #{partition_name} PARTITION OF #{table_name}
           FOR VALUES FROM (#{lower_bound}) TO (#{upper_bound})
         SQL
       end

spec/lib/gitlab/database/partitioning_migration_helpers/table_management_helpers_spec.rb

@@ -241,7 +241,7 @@ describe Gitlab::Database::PartitioningMigrationHelpers::TableManagementHelpers
 
   describe '#drop_partitioned_table_for' do
     let(:expected_tables) do
-      %w[000000 201912 202001 202002].map { |suffix| "partitions_dynamic.#{partitioned_table}_#{suffix}" }.unshift(partitioned_table)
+      %w[000000 201912 202001 202002].map { |suffix| "#{partitioned_table}_#{suffix}" }.unshift(partitioned_table)
     end
 
     context 'when the table is not whitelisted' do

spec/support/helpers/partitioning_helpers.rb

@@ -8,8 +8,8 @@ module PartitioningHelpers
     expect(columns_with_part_type).to match_array(actual_columns)
   end
 
-  def expect_range_partition_of(partition_name, table_name, min_value, max_value, schema: 'partitions_dynamic')
-    definition = find_partition_definition(partition_name, schema: schema)
+  def expect_range_partition_of(partition_name, table_name, min_value, max_value)
+    definition = find_partition_definition(partition_name)
 
     expect(definition).not_to be_nil
     expect(definition['base_table']).to eq(table_name.to_s)
@@ -40,7 +40,7 @@ module PartitioningHelpers
     SQL
   end
 
-  def find_partition_definition(partition, schema: 'partitions_dynamic')
+  def find_partition_definition(partition)
     connection.select_one(<<~SQL)
       select
         parent_class.relname as base_table,
@@ -48,10 +48,7 @@ module PartitioningHelpers
       from pg_class
       inner join pg_inherits i on pg_class.oid = inhrelid
       inner join pg_class parent_class on parent_class.oid = inhparent
-      inner join pg_namespace ON pg_namespace.oid = pg_class.relnamespace
-      where pg_namespace.nspname = '#{schema}'
-        and pg_class.relname = '#{partition}'
-        and pg_class.relispartition
+      where pg_class.relname = '#{partition}' and pg_class.relispartition;
     SQL
   end
 end