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 \'[]\'
        Literal \'Array(UInt8)\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier a
