Function process_query_params

contrib/postgres_fdw/postgres_fdw.c:4895–4930

* Construct array of query parameter values in text format. */

 * Construct array of query parameter values in text format.
 */
static void
process_query_params(ExprContext *econtext,
					 FmgrInfo *param_flinfo,
					 List *param_exprs,
					 const char **param_values)
{
	int			nestlevel;
	int			i;
	ListCell   *lc;

	nestlevel = set_transmission_modes();

	i = 0;
	foreach(lc, param_exprs)
	{
		ExprState  *expr_state = (ExprState *) lfirst(lc);
		Datum		expr_value;
		bool		isNull;

		/* Evaluate the parameter expression */
		expr_value = ExecEvalExpr(expr_state, econtext, &isNull);

		/*
		 * Get string representation of each parameter value by invoking
		 * type-specific output function, unless the value is null.
		 */
		if (isNull)
			param_values[i] = NULL;
		else
			param_values[i] = OutputFunctionCall(&param_flinfo[i], expr_value);

		i++;
	}

	reset_transmission_modes(nestlevel);
}

/*
 * postgresAnalyzeForeignTable