SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function toFloat64 (alias x) (children 1)
     ExpressionList (children 1)
      Literal Float64_1
    Function toDecimal64 (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_18
    Function toDecimal64 (children 1)
     ExpressionList (children 2)
      Function negate (children 1)
       ExpressionList (children 1)
        Identifier x
      Literal UInt64_18