Revert "Allow `:precision` option for time type columns"

This reverts commit 1502caefd30b137fd1a0865be34c5bbf85ba64c1.

The test suite for the mysql adapter broke when this commit was used
with MySQL 5.6.

Conflicts:
	activerecord/CHANGELOG.md

1 files changed, 0 insertions, 65 deletions

diff --git a/activerecord/test/cases/time_precision_test.rb b/activerecord/test/cases/time_precision_test.rb
deleted file mode 100644
index 23422fd50a..0000000000
--- a/activerecord/test/cases/time_precision_test.rb
+++ /dev/null
@@ -1,65 +0,0 @@
-require 'cases/helper'
-
-if ActiveRecord::Base.connection.supports_datetime_with_precision?
-class TimePrecisionTest < ActiveRecord::TestCase
-  setup do
-    @connection = ActiveRecord::Base.connection
-  end
-
-  teardown do
-    @connection.drop_table :foos, if_exists: true
-  end
-
-  def test_time_data_type_with_precision
-    @connection.create_table(:foos, force: true)
-    @connection.add_column :foos, :start,  :time, precision: 3
-    @connection.add_column :foos, :finish, :time, precision: 6
-    assert_equal 3, activerecord_column_option('foos', 'start',  'precision')
-    assert_equal 6, activerecord_column_option('foos', 'finish', 'precision')
-  end
-
-  def test_passing_precision_to_time_does_not_set_limit
-    @connection.create_table(:foos, force: true) do |t|
-      t.time :start,  precision: 3
-      t.time :finish, precision: 6
-    end
-    assert_nil activerecord_column_option('foos', 'start',  'limit')
-    assert_nil activerecord_column_option('foos', 'finish', 'limit')
-  end
-
-  def test_invalid_time_precision_raises_error
-    assert_raises ActiveRecord::ActiveRecordError do
-      @connection.create_table(:foos, force: true) do |t|
-        t.time :start,  precision: 7
-        t.time :finish, precision: 7
-      end
-    end
-  end
-
-  def test_database_agrees_with_activerecord_about_precision
-    @connection.create_table(:foos, force: true) do |t|
-      t.time :start,  precision: 2
-      t.time :finish, precision: 4
-    end
-    assert_equal 2, database_datetime_precision('foos', 'start')
-    assert_equal 4, database_datetime_precision('foos', 'finish')
-  end
-
-  private
-
-  def database_datetime_precision(table_name, column_name)
-    results = @connection.exec_query("SELECT column_name, datetime_precision FROM information_schema.columns WHERE table_name = '#{table_name}'")
-    result = results.find do |result_hash|
-      result_hash["column_name"] == column_name
-    end
-    result && result["datetime_precision"].to_i
-  end
-
-  def activerecord_column_option(tablename, column_name, option)
-    result = @connection.columns(tablename).find do |column|
-      column.name == column_name
-    end
-    result && result.send(option)
-  end
-end
-end