diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 8a1531e7ec..116363f2d9 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Omit redundant `using: :btree` for schema dumping.
+
+    *Ryuta Kamizono*
+
 *   Deprecate passing `default` to `index_name_exists?`.
 
     *Ryuta Kamizono*
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index 12289511b7..cf4495326b 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -188,7 +188,7 @@ HEADER
         index_parts << "length: { #{format_options(index.lengths)} }" if index.lengths.present?
         index_parts << "order: { #{format_options(index.orders)} }" if index.orders.present?
         index_parts << "where: #{index.where.inspect}" if index.where
-        index_parts << "using: #{index.using.inspect}" if index.using
+        index_parts << "using: #{index.using.inspect}" if index.using && index.using != :btree
         index_parts << "type: #{index.type.inspect}" if index.type
         index_parts << "comment: #{index.comment.inspect}" if index.comment
         index_parts
diff --git a/activerecord/test/cases/comment_test.rb b/activerecord/test/cases/comment_test.rb
index a625299e8d..63f67a9a16 100644
--- a/activerecord/test/cases/comment_test.rb
+++ b/activerecord/test/cases/comment_test.rb
@@ -113,7 +113,7 @@ if ActiveRecord::Base.connection.supports_comments?
       assert_match %r[t\.string\s+"content",\s+comment: "Whoa, content describes itself!"], output
       assert_match %r[t\.integer\s+"rating",\s+comment: "I am running out of imagination"], output
       assert_match %r[t\.index\s+.+\s+comment: "\\\"Very important\\\" index that powers all the performance.\\nAnd it's fun!"], output
-      assert_match %r[t\.index\s+.+\s+name: "idx_obvious",.+\s+comment: "We need to see obvious comments"], output
+      assert_match %r[t\.index\s+.+\s+name: "idx_obvious",\s+comment: "We need to see obvious comments"], output
     end
 
     def test_schema_dump_omits_blank_comments
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 68193af16c..9584318e86 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -178,24 +178,20 @@ class SchemaDumperTest < ActiveRecord::TestCase
   end
 
   def test_schema_dumps_index_columns_in_right_order
-    index_definition = standard_dump.split(/\n/).grep(/t\.index.*company_index/).first.strip
+    index_definition = dump_table_schema("companies").split(/\n/).grep(/t\.index.*company_index/).first.strip
     if current_adapter?(:PostgreSQLAdapter)
-      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index", order: { rating: :desc }, using: :btree', index_definition
+      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index", order: { rating: :desc }', index_definition
     elsif current_adapter?(:Mysql2Adapter)
-      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index", length: { type: 10 }, using: :btree', index_definition
+      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index", length: { type: 10 }', index_definition
     else
       assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index"', index_definition
     end
   end
 
   def test_schema_dumps_partial_indices
-    index_definition = standard_dump.split(/\n/).grep(/t\.index.*company_partial_index/).first.strip
-    if current_adapter?(:PostgreSQLAdapter)
-      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", where: "(rating > 10)", using: :btree', index_definition
-    elsif current_adapter?(:Mysql2Adapter)
-      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", using: :btree', index_definition
-    elsif current_adapter?(:SQLite3Adapter) && ActiveRecord::Base.connection.supports_partial_index?
-      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", where: "rating > 10"', index_definition
+    index_definition = dump_table_schema("companies").split(/\n/).grep(/t\.index.*company_partial_index/).first.strip
+    if current_adapter?(:PostgreSQLAdapter, :SQLite3Adapter) && ActiveRecord::Base.connection.supports_partial_index?
+      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", where: "(rating > 10)"', index_definition
     else
       assert_equal 't.index ["firm_id", "type"], name: "company_partial_index"', index_definition
     end
@@ -248,9 +244,9 @@ class SchemaDumperTest < ActiveRecord::TestCase
     end
 
     def test_schema_dumps_index_type
-      output = standard_dump
-      assert_match %r{t\.index \["awesome"\], name: "index_key_tests_on_awesome", type: :fulltext}, output
-      assert_match %r{t\.index \["pizza"\], name: "index_key_tests_on_pizza", using: :btree}, output
+      output = dump_table_schema "key_tests"
+      assert_match %r{t\.index \["awesome"\], name: "index_key_tests_on_awesome", type: :fulltext$}, output
+      assert_match %r{t\.index \["pizza"\], name: "index_key_tests_on_pizza"$}, output
     end
   end
 
@@ -277,7 +273,7 @@ class SchemaDumperTest < ActiveRecord::TestCase
 
     def test_schema_dump_expression_indices
       index_definition = dump_table_schema("companies").split(/\n/).grep(/t\.index.*company_expression_index/).first.strip
-      assert_equal 't.index "lower((name)::text)", name: "company_expression_index", using: :btree', index_definition
+      assert_equal 't.index "lower((name)::text)", name: "company_expression_index"', index_definition
     end
 
     def test_schema_dump_interval_type
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index d1acf4524f..08bef08abc 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -201,7 +201,7 @@ ActiveRecord::Schema.define do
     t.integer :account_id
     t.string :description, default: ""
     t.index [:firm_id, :type, :rating], name: "company_index", length: { type: 10 }, order: { rating: :desc }
-    t.index [:firm_id, :type], name: "company_partial_index", where: "rating > 10"
+    t.index [:firm_id, :type], name: "company_partial_index", where: "(rating > 10)"
     t.index :name, name: "company_name_index", using: :btree
     t.index "lower(name)", name: "company_expression_index" if supports_expression_index?
   end