Function markRTEForSelectPriv

src/backend/parser/parse_relation.c:1026–1099

* markRTEForSelectPriv * Mark the specified column of the RTE with index rtindex * as requiring SELECT privilege * * col == InvalidAttrNumber means a "whole row" reference */

 * col == InvalidAttrNumber means a "whole row" reference
 */
static void
markRTEForSelectPriv(ParseState *pstate, int rtindex, AttrNumber col)
{
	RangeTblEntry *rte = rt_fetch(rtindex, pstate->p_rtable);

	if (rte->rtekind == RTE_RELATION)
	{
		/* Make sure the rel as a whole is marked for SELECT access */
		rte->requiredPerms |= ACL_SELECT;
		/* Must offset the attnum to fit in a bitmapset */
		rte->selectedCols = bms_add_member(rte->selectedCols,
										   col - FirstLowInvalidHeapAttributeNumber);
	}
	else if (rte->rtekind == RTE_JOIN)
	{
		if (col == InvalidAttrNumber)
		{
			/*
			 * A whole-row reference to a join has to be treated as whole-row
			 * references to the two inputs.
			 */
			JoinExpr   *j;

			if (rtindex > 0 && rtindex <= list_length(pstate->p_joinexprs))
				j = list_nth_node(JoinExpr, pstate->p_joinexprs, rtindex - 1);
			else
				j = NULL;
			if (j == NULL)
				elog(ERROR, "could not find JoinExpr for whole-row reference");

			/* Note: we can't see FromExpr here */
			if (IsA(j->larg, RangeTblRef))
			{
				int			varno = ((RangeTblRef *) j->larg)->rtindex;

				markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
			}
			else if (IsA(j->larg, JoinExpr))
			{
				int			varno = ((JoinExpr *) j->larg)->rtindex;

				markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
			}
			else
				elog(ERROR, "unrecognized node type: %d",
					 (int) nodeTag(j->larg));
			if (IsA(j->rarg, RangeTblRef))
			{
				int			varno = ((RangeTblRef *) j->rarg)->rtindex;

				markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
			}
			else if (IsA(j->rarg, JoinExpr))
			{
				int			varno = ((JoinExpr *) j->rarg)->rtindex;

				markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
			}