Function ExecSetExecProcNode

src/backend/executor/execProcnode.c:579–590

* If a node wants to change its ExecProcNode function after ExecInitNode() * has finished, it should do so with this function. That way any wrapper * functions can be reinstalled, without the node having to know how that * works. */

 * works.
 */
void
ExecSetExecProcNode(PlanState *node, ExecProcNodeMtd function)
{
	/*
	 * Add a wrapper around the ExecProcNode callback that checks stack depth
	 * during the first execution and maybe adds an instrumentation wrapper.
	 * When the callback is changed after execution has already begun that
	 * means we'll superfluously execute ExecProcNodeFirst, but that seems ok.
	 */
	node->ExecProcNodeReal = function;
	node->ExecProcNode = ExecProcNodeFirst;
}


/*