Don't use arel factory methods for creating join nodes

Directly `klass.new` is clear enough than factory methods.

activerecord/lib/active_record/associations/association_scope.rb

@@ -52,7 +52,7 @@ module ActiveRecord
         attr_reader :value_transformation
 
         def join(table, constraint)
-          table.create_join(table, table.create_on(constraint), Arel::Nodes::LeadingJoin)
+          Arel::Nodes::LeadingJoin.new(table, Arel::Nodes::On.new(constraint))
         end
 
         def last_chain_scope(scope, reflection, owner)

activerecord/lib/active_record/associations/join_dependency/join_association.rb

@@ -50,7 +50,7 @@ module ActiveRecord
               end
             end
 
-            joins << table.create_join(table, table.create_on(nodes), join_type)
+            joins << join_type.new(table, Arel::Nodes::On.new(nodes))
 
             if others && !others.empty?
               joins.concat arel.join_sources
@@ -79,7 +79,7 @@ module ActiveRecord
         private
           def append_constraints(join, constraints)
             if join.is_a?(Arel::Nodes::StringJoin)
-              join_string = table.create_and(constraints.unshift(join.left))
+              join_string = Arel::Nodes::And.new(constraints.unshift join.left)
               join.left = Arel.sql(base_klass.connection.visitor.compile(join_string))
             else
               right = join.right

activerecord/lib/active_record/relation/query_methods.rb

@@ -1252,7 +1252,7 @@ module ActiveRecord
         end
 
         joins.each_with_index do |join, i|
-          joins[i] = table.create_string_join(Arel.sql(join.strip)) if join.is_a?(String)
+          joins[i] = Arel::Nodes::StringJoin.new(Arel.sql(join.strip)) if join.is_a?(String)
         end
 
         while joins.first.is_a?(Arel::Nodes::Join)