Function addRangeTableEntryForRelation

src/backend/parser/parse_relation.c:1582–1645

* Add an entry for a relation to the pstate's range table (p_rtable). * Then, construct and return a ParseNamespaceItem for the new RTE. * * This is just like addRangeTableEntry() except that it makes an RTE * given an already-open relation instead of a RangeVar reference. * * lockmode is the lock type required for query execution; it must be one * of AccessShareLock, RowShareLock, RowExclu

 * LOCKMODE is typedef'd as int anyway, that seems like overkill.
 */
ParseNamespaceItem *
addRangeTableEntryForRelation(ParseState *pstate,
							  Relation rel,
							  int lockmode,
							  Alias *alias,
							  bool inh,
							  bool inFromCl)
{
	RangeTblEntry *rte = makeNode(RangeTblEntry);
	char	   *refname = alias ? alias->aliasname : RelationGetRelationName(rel);

	Assert(pstate != NULL);

	Assert(lockmode == AccessShareLock ||
		   lockmode == RowShareLock ||
		   lockmode == RowExclusiveLock ||
		   lockmode == ExclusiveLock); /* GPDB: we might upgrade lock level */
	Assert(CheckRelationLockedByMe(rel, lockmode, true));

	rte->rtekind = RTE_RELATION;
	rte->alias = alias;
	rte->relid = RelationGetRelid(rel);
	rte->relkind = rel->rd_rel->relkind;
	rte->rellockmode = lockmode;
	rte->relisivm = rel->rd_rel->relisivm;

	/*
	 * Build the list of effective column names using user-supplied aliases
	 * and/or actual column names.
	 */
	rte->eref = makeAlias(refname, NIL);
	buildRelationAliases(rel->rd_att, alias, rte->eref);

	/*
	 * Set flags and access permissions.
	 *
	 * The initial default on access checks is always check-for-READ-access,
	 * which is the right thing for all except target tables.
	 */
	rte->lateral = false;
	rte->inh = inh;
	rte->inFromCl = inFromCl;

	rte->requiredPerms = ACL_SELECT;
	rte->checkAsUser = InvalidOid;	/* not set-uid by default, either */
	rte->selectedCols = NULL;
	rte->insertedCols = NULL;
	rte->updatedCols = NULL;
	rte->extraUpdatedCols = NULL;

	/*
	 * Add completed RTE to pstate's range table list, so that we know its
	 * index.  But we don't add it to the join list --- caller must do that if
	 * appropriate.
	 */
	pstate->p_rtable = lappend(pstate->p_rtable, rte);

	/*