Merge pull request #10572 from nertzy/dont-modify-options-hash-in-primary-key

Don't modify args in TableDefinition#primary_key

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -65,8 +65,7 @@ def columns; @columns_hash.values; end
       # Appends a primary key definition to the table definition.
       # Can be called multiple times, but this is probably not a good idea.
       def primary_key(name, type = :primary_key, options = {})
-        options[:primary_key] = true
-        column(name, type, options)
+        column(name, type, options.merge(:primary_key => true))
       end
 
       # Returns a ColumnDefinition for the column with name +name+.