Function ExpandSingleTable

src/backend/parser/parse_target.c:1370–1408

* ExpandSingleTable() * Transforms foo.* into a list of expressions or targetlist entries. * * This handles the case where foo has been determined to be a simple * reference to an RTE, so we can just generate Vars for the expressions. * * The referenced columns are marked as requiring SELECT access. */

 * The referenced columns are marked as requiring SELECT access.
 */
static List *
ExpandSingleTable(ParseState *pstate, ParseNamespaceItem *nsitem,
				  int sublevels_up, int location, bool make_target_entry)
{
	if (make_target_entry)
	{
		/* expandNSItemAttrs handles permissions marking */
		return expandNSItemAttrs(pstate, nsitem, sublevels_up, location);
	}
	else
	{
		RangeTblEntry *rte = nsitem->p_rte;
		List	   *vars;
		ListCell   *l;

		vars = expandNSItemVars(nsitem, sublevels_up, location, NULL);

		/*
		 * Require read access to the table.  This is normally redundant with
		 * the markVarForSelectPriv calls below, but not if the table has zero
		 * columns.  We need not do anything if the nsitem is for a join: its
		 * component tables will have been marked ACL_SELECT when they were
		 * added to the rangetable.  (This step changes things only for the
		 * target relation of UPDATE/DELETE, which cannot be under a join.)
		 */
		if (rte->rtekind == RTE_RELATION)
			rte->requiredPerms |= ACL_SELECT;

		/* Require read access to each column */
		foreach(l, vars)
		{
			Var		   *var = (Var *) lfirst(l);

			markVarForSelectPriv(pstate, var);
		}

		return vars;
	}
}

/*
 * ExpandRowReference()