Refactor delegating join_primary_key instead of join_keys and association_primary_key in TableMetadata

Because `join_primary_key` is called by `join_keys` and it is to
abstract calling `association_primary_key`.

activerecord/lib/active_record/reflection.rb

@@ -293,7 +293,7 @@ module ActiveRecord
         Relation.create(klass, table, predicate_builder)
       end
 
-      def join_primary_key(_)
+      def join_primary_key(*)
         foreign_key
       end
 
@@ -722,7 +722,7 @@ module ActiveRecord
         end
       end
 
-      def join_primary_key(klass)
+      def join_primary_key(klass = nil)
         polymorphic? ? association_primary_key(klass) : association_primary_key
       end
 

activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb

@@ -30,7 +30,7 @@ module ActiveRecord
         end
 
         def primary_key
-          associated_table.association_join_keys.key
+          associated_table.association_join_primary_key
         end
 
         def convert_to_id(value)

activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb

@@ -29,7 +29,7 @@ module ActiveRecord
         end
 
         def primary_key(value)
-          associated_table.association_primary_key(base_class(value))
+          associated_table.association_join_primary_key(base_class(value))
         end
 
         def base_class(value)

activerecord/lib/active_record/table_metadata.rb

@@ -2,8 +2,7 @@
 
 module ActiveRecord
   class TableMetadata # :nodoc:
-    delegate :foreign_type, :foreign_key, :join_keys, :join_foreign_key, to: :association, prefix: true
-    delegate :association_primary_key, to: :association
+    delegate :foreign_type, :foreign_key, :join_primary_key, :join_foreign_key, to: :association, prefix: true
 
     def initialize(klass, arel_table, association = nil)
       @klass = klass