SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function transform (children 1)
     ExpressionList (children 4)
      Literal \'a\'
      Literal Array_[\'a\', \'b\']
      Function array (children 1)
       ExpressionList (children 2)
        Function toDateTime64 (children 1)
         ExpressionList (children 3)
          Literal UInt64_1
          Literal UInt64_3
          Literal \'UTC\'
        Function toDateTime64 (children 1)
         ExpressionList (children 3)
          Literal UInt64_2
          Literal UInt64_3
          Literal \'UTC\'
      Function toDateTime64 (children 1)
       ExpressionList (children 3)
        Literal UInt64_0
        Literal UInt64_3
        Literal \'UTC\'
