Function get_leftop

src/include/nodes/nodeFuncs.h:72–81

Extract left arg of a binary opclause, or only arg of a unary opclause */

/* Extract left arg of a binary opclause, or only arg of a unary opclause */
static inline Node *
get_leftop(const void *clause)
{
	const OpExpr *expr = (const OpExpr *) clause;

	if (expr->args != NIL)
		return (Node *) linitial(expr->args);
	else
		return NULL;
}

/* Extract right arg of a binary opclause (NULL if it's a unary opclause) */
static inline Node *