diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
index bc378c04762b0356112b5255c4c895dee0317961..06c89ca072d5c665a1ed756c9fcb2af9fff26570 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
@@ -7,9 +7,7 @@ module ConnectionAdapters # :nodoc:
     # Adapter level by over-writing this code inside the database specific adapters
     module ColumnDumper
       def column_spec(column)
-        spec = Hash[prepare_column_options(column).map { |k, v| [k, "#{k}: #{v}"] }]
-        spec[:type] = schema_type(column).to_s
-        spec
+        [schema_type(column), prepare_column_options(column)]
       end
 
       def column_spec_for_primary_key(column)
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index 6f24e6d182463f0e6712e61e41d94f6a7f4cd3aa..c1c6519cfa3f497d0056432720be554655a5198e 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -115,9 +115,7 @@ def table(table, stream)
             pkcol = columns.detect { |c| c.name == pk }
             pkcolspec = @connection.column_spec_for_primary_key(pkcol)
             if pkcolspec.present?
-              pkcolspec.each do |key, value|
-                tbl.print ", #{key}: #{value}"
-              end
+              tbl.print ", #{format_colspec(pkcolspec)}"
             end
           when Array
             tbl.print ", primary_key: #{pk.inspect}"
@@ -133,16 +131,14 @@ def table(table, stream)
 
           tbl.puts " do |t|"
 
-          # find all migration keys used in this table
-          keys = @connection.migration_keys
-
           # then dump all non-primary key columns
           columns.each do |column|
             raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" unless @connection.valid_type?(column.type)
             next if column.name == pk
-            colspec = @connection.column_spec(column)
-            values = [column.name.inspect] + keys.map { |key| colspec[key] }.compact
-            tbl.puts "    t.#{colspec[:type]} #{values.join(", ")}"
+            type, colspec = @connection.column_spec(column)
+            tbl.print "    t.#{type} #{column.name.inspect}"
+            tbl.print ", #{format_colspec(colspec)}" if colspec.present?
+            tbl.puts
           end
 
           indexes_in_create(table, tbl)
@@ -228,6 +224,10 @@ def foreign_keys(table, stream)
         end
       end
 
+      def format_colspec(colspec)
+        colspec.map { |key, value| "#{key}: #{value}" }.join(", ")
+      end
+
       def format_options(options)
         options.map { |key, value| "#{key}: #{value.inspect}" }.join(", ")
       end