SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function map (alias value) (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Literal \'Test\'
    Literal \'Array(Tuple(UInt64, String))\' (alias type)
   ExpressionList (children 3)
    Identifier value
    Function CAST (children 1)
     ExpressionList (children 2)
      Identifier value
      Identifier type
    Function CAST (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier value
      Identifier type