Function ExecEvalParamExec

src/backend/executor/execExprInterp.c:2487–2502

* Evaluate a PARAM_EXEC parameter. * * PARAM_EXEC params (internal executor parameters) are stored in the * ecxt_param_exec_vals array, and can be accessed by array index. */

 * ecxt_param_exec_vals array, and can be accessed by array index.
 */
void
ExecEvalParamExec(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
{
	ParamExecData *prm;

	prm = &(econtext->ecxt_param_exec_vals[op->d.param.paramid]);
	if (unlikely(prm->execPlan != NULL))
	{
		/* Parameter not evaluated yet, so go do it */
		ExecSetParamPlan(prm->execPlan, econtext, NULL);
		/* ExecSetParamPlan should have processed this param... */
		Assert(prm->execPlan == NULL);
	}
	*op->resvalue = prm->value;
	*op->resnull = prm->isnull;
}

/*
 * Evaluate a PARAM_EXTERN parameter.