SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function divideDecimal (children 1)
     ExpressionList (children 2)
      Function toDecimal256 (children 1)
       ExpressionList (children 2)
        Literal Float64_1e39
        Literal UInt64_0
      Function toDecimal256 (children 1)
       ExpressionList (children 2)
        Literal Float64_1e-38
        Literal UInt64_39