Function printRemoteParam

contrib/postgres_fdw/deparse.c:3263–3271

* Print the representation of a parameter to be sent to the remote side. * * Note: we always label the Param's type explicitly rather than relying on * transmitting a numeric type OID in PQexecParams(). This allows us to * avoid assuming that types have the same OIDs on the remote side as they * do locally --- they need only have the same names. */

 * do locally --- they need only have the same names.
 */
static void
printRemoteParam(int paramindex, Oid paramtype, int32 paramtypmod,
				 deparse_expr_cxt *context)
{
	StringInfo	buf = context->buf;
	char	   *ptypename = deparse_type_name(paramtype, paramtypmod);

	appendStringInfo(buf, "$%d::%s", paramindex, ptypename);
}

/*
 * Print the representation of a placeholder for a parameter that will be