SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function quantile (children 2)
     ExpressionList (children 1)
      Literal NULL
     ExpressionList (children 1)
      Literal Float64_0.5
    Function quantiles (children 2)
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal NULL
        Literal \'Nullable(UInt32)\'
     ExpressionList (children 2)
      Literal Float64_0.1
      Literal Float64_0.2
    Function count (children 1)
     ExpressionList (children 1)
      Literal NULL
    Function sum (children 1)
     ExpressionList (children 1)
      Literal NULL
