Function convert_value_to_string

src/pl/plpgsql/src/pl_exec.c:7618–7632

---------- * convert_value_to_string Convert a non-null Datum to C string * * Note: the result is in the estate's eval_mcontext, and will be cleared * by the next exec_eval_cleanup() call. The invoked output function might * leave additional cruft there as well, so just pfree'ing the result string * would not be enough to avoid memory leaks if we did not do it like this. * In most usages

 * ----------
 */
static char *
convert_value_to_string(PLpgSQL_execstate *estate, Datum value, Oid valtype)
{
	char	   *result;
	MemoryContext oldcontext;
	Oid			typoutput;
	bool		typIsVarlena;

	oldcontext = MemoryContextSwitchTo(get_eval_mcontext(estate));
	getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
	result = OidOutputFunctionCall(typoutput, value);
	MemoryContextSwitchTo(oldcontext);

	return result;
}

/* ----------
 * exec_cast_value			Cast a value if required