SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function arrayReduce (alias a) (children 1)
     ExpressionList (children 2)
      Literal \'sum\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal Array_[NULL, UInt64_10]
        Literal \'Array(Nullable(UInt8))\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier a
