Function IsCTIDVar

src/backend/optimizer/path/tidpath.c:57–67

* Does this Var represent the CTID column of the specified baserel? */

 * Does this Var represent the CTID column of the specified baserel?
 */
static inline bool
IsCTIDVar(Var *var, RelOptInfo *rel)
{
	/* The vartype check is strictly paranoia */
	if (var->varattno == SelfItemPointerAttributeNumber &&
		var->vartype == TIDOID &&
		var->varno == rel->relid &&
		var->varlevelsup == 0)
		return true;
	return false;
}

/*
 * Check to see if a RestrictInfo is of the form