Should keep the table name qualified `*` for distinct subquery

activerecord/lib/active_record/relation/calculations.rb

@@ -388,7 +388,7 @@ def select_for_count
       def build_count_subquery(relation, column_name, distinct)
         relation.select_values = [
           if column_name == :all
-            distinct ? Arel.star : Arel.sql("1")
+            distinct ? table[Arel.star] : Arel.sql("1")
           else
             column_alias = Arel.sql("count_column")
             aggregate_column(column_name).as(column_alias)

activerecord/test/cases/calculations_test.rb

@@ -248,6 +248,18 @@ def test_distinct_count_with_order_and_limit_and_offset
     assert_equal 4, Account.distinct.order(:firm_id).limit(4).offset(2).count
   end
 
+  def test_distinct_joins_count_with_order_and_limit
+    assert_equal 3, Account.joins(:firm).distinct.order(:firm_id).limit(3).count
+  end
+
+  def test_distinct_joins_count_with_order_and_offset
+    assert_equal 3, Account.joins(:firm).distinct.order(:firm_id).offset(2).count
+  end
+
+  def test_distinct_joins_count_with_order_and_limit_and_offset
+    assert_equal 3, Account.joins(:firm).distinct.order(:firm_id).limit(3).offset(2).count
+  end
+
   def test_should_group_by_summed_field_having_condition
     c = Account.group(:firm_id).having("sum(credit_limit) > 50").sum(:credit_limit)
     assert_nil        c[1]