SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function toDecimal32 (alias x) (children 1)
     ExpressionList (children 2)
      Literal \'1.0\'
      Literal UInt64_5
    Function erf (children 1)
     ExpressionList (children 1)
      Identifier x
    Function erfc (children 1)
     ExpressionList (children 1)
      Identifier x