Getting relations accessed by a query using the raw query string

Hi,

Having a query string, I am trying to use the postgres parser to find which
relations the query accesses. This is what I currently have:

const char *query_string="select * from dummytable;";
List *parsetree_list=pg_parse_query(query_string);
ListCell *parsetree_item;

foreach(parsetree_item,parsetree_list){
RawStmt *parsetree=lfirst_node(RawStmt,parsetree_item);
Query *query=parse_analyze(parsetree,query_string,NULL,0,NULL);
}

However, when I inspect the variable "query", it is not populated
correctly. For example, commandType is set to CMD_DELETE while I have
passed a SELECT query.
- What am I doing wrong?
- Once I get the query correctly, how can I get the list of relations it
gets access to?
- Or any other ways to get the list of relations from raw query string
through postgres calls?

Thank you!