title: The 'default' dialect with current database version settings does not support in-place multirow inserts
body: <p>I have data in a list of dict，i tried to insert the data into my db then i get error <strong>sqlalchemy.exc.CompileError: The 'default' dialect with current database version settings does not support in-place multirow inserts.</strong></p>
  
  <pre><code>from sqlalchemy import create_engine,Table,Column,String,Integer,MetaData,ForeignKey
  from sqlalchemy_utils import database_exists,create_database,drop_database
  from sqlalchemy.orm import join
  
  engine = create_engine("mysql+mysqldb://root:268454@localhost:3306/sqlalchemy")
  conn = engine.connect()
  
  if database_exists(engine.url):
      drop_database(engine.url)
  
  create_database(engine.url)
  
  metaData = MetaData()
  
  userTable = Table("user", metaData
      , Column("Id", Integer, primary_key = True)
      , Column("Name", String(25)))
  
  orderTable = Table("order", metaData
      , Column("Id", Integer, primary_key = True)
      , Column("UserId", Integer, ForeignKey("user.Id"))
      , Column("Desc", String(250)))
  
  try:
      metaData.create_all(engine)
  except Exception as ex:
      print(ex)
  
  users = [
      {"Id": 1,
      "Name": "user1"},
      {"Id": 2,
      "Name": "user2"},
      {"Id": 3,
      "Name": "user3"},
      {"Id": 4,
      "Name": "user4"}
  ]
  
  orders = [
      {"Id": 1,
      "UserId": 1,
      "Desc": "desc1"},
      {"Id": 2,
      "UserId": 1,
      "Desc": "desc2"},
      {"Id": 3,
      "UserId": 2,
      "Desc": "desc3"},
      {"Id": 4,
      "UserId": 2,
      "Desc": "desc4"},
  ]
  
  sql = userTable.insert().values(users)
  print(sql) #this line causes the exception
  
  conn.execute(sql)
  
  sql = orderTable.insert().values(orders)
  print(sql)
  
  conn.execute(sql)
  
  sql = userTable.select()
  print(sql)
  returnUsers = conn.execute(sql)
  print(returnUsers)
  
  sql = orderTable.select()
  print(sql)
  returnOrders = conn.execute(sql)
  print(returnOrders)
  
  conn.close()
  </code></pre>
  
  <p><strong>update：without print(sql) it can works perfectly.</strong></p>