PostgreSQL 10 new relkind for partitioned tables (#31336)

* PostgreSQL 10 new relkind for partitioned tables

Starting with PostgreSQL 10, we can now have partitioned tables natively

* Add comment

* Remove extra space

* Add test for partition table in postgreSQL10

* Select 'p' for "BASE TABLE" and add a test case
to support PostgreSQL 10 partition tables

* Address RuboCop offense

* Addressed incorrect `postgresql_version`

Fixes #33008.

[Yannick Schutz & Yasuo Honda & Ryuta Kamizono]

activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

@@ -751,7 +751,7 @@ def add_options_for_index_columns(quoted_columns, **options)
 
           def data_source_sql(name = nil, type: nil)
             scope = quoted_scope(name, type: type)
-            scope[:type] ||= "'r','v','m','f'" # (r)elation/table, (v)iew, (m)aterialized view, (f)oreign table
+            scope[:type] ||= "'r','v','m','p','f'" # (r)elation/table, (v)iew, (m)aterialized view, (p)artitioned table, (f)oreign table
 
             sql = "SELECT c.relname FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace".dup
             sql << " WHERE n.nspname = #{scope[:schema]}"
@@ -765,7 +765,7 @@ def quoted_scope(name = nil, type: nil)
             type = \
               case type
               when "BASE TABLE"
-                "'r'"
+                "'r','p'"
               when "VIEW"
                 "'v','m'"
               when "FOREIGN TABLE"

activerecord/test/cases/adapters/postgresql/partitions_test.rb

+# frozen_string_literal: true
+
+require "cases/helper"
+
+class PostgreSQLPartitionsTest < ActiveRecord::PostgreSQLTestCase
+  def setup
+    @connection = ActiveRecord::Base.connection
+  end
+
+  def teardown
+    @connection.drop_table "partitioned_events", if_exists: true
+  end
+
+  def test_partitions_table_exists
+    skip unless ActiveRecord::Base.connection.postgresql_version >= 100000
+    @connection.create_table :partitioned_events, force: true, id: false,
+      options: "partition by range (issued_at)" do |t|
+      t.timestamp :issued_at
+    end
+    assert @connection.table_exists?("partitioned_events")
+  end
+end