SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function toDecimal128 (alias x) (children 1)
     ExpressionList (children 2)
      Literal \'4.2\'
      Literal UInt64_1
    Function pow (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_2
    Function pow (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal Float64_0.5