SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function toInt64 (alias x) (children 1)
     ExpressionList (children 1)
      Literal UInt64_999999999999999999
    Function toDecimal128 (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_0
    Function toDecimal128 (children 1)
     ExpressionList (children 2)
      Function negate (children 1)
       ExpressionList (children 1)
        Identifier x
      Literal UInt64_0