SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dictGetKeys (children 1)
     ExpressionList (children 3)
      Literal \'dict_types\'
      Literal \'dt64\'
      Function toDateTime64 (children 1)
       ExpressionList (children 2)
        Literal \'1970-01-01 00:00:00\'
        Literal UInt64_3
