how to use the struct "RangeFunction" in Postgres 9.6 ?

[lin <jluwln@xxxxxxx>]

Hi all,

  I am puzzled for how to use the struct "RangeFunction" in Postgres 9.6, the struct "RangeFunction" is not the same with 9.3.

Can someone help me how to write the function "make_RangeFunction"?

the code as below: 

               SelectStmt *stmt = makeNode(SelectStmt);

List *args = list_make1(makeStringConst($2, @2));

args = lappend(args, makeStringConst($3, @3));

stmt->targetList = list_make1(make_star_target(-1));

stmt->fromClause = list_make1(make_RangeFunction("function_name", args));

static Node* make_RangeFunction(const char *func_name, List *func_args)

{

  RangeFunction *n = makeNode(RangeFunction);

.... (how to write this function)

}

Thanks,

  wln