Use text type in add_node() to calm down opr_sanity regression test

Author: kelvich

multimaster--1.0.sql

@@ -13,7 +13,7 @@ CREATE FUNCTION mtm.drop_node(node integer, drop_slot bool default false) RETURN
 AS 'MODULE_PATHNAME','mtm_drop_node'
 LANGUAGE C;
 
-CREATE FUNCTION mtm.add_node(conn_str cstring) RETURNS void
+CREATE FUNCTION mtm.add_node(conn_str text) RETURNS void
 AS 'MODULE_PATHNAME','mtm_add_node'
 LANGUAGE C;
 

multimaster.c

@@ -3014,7 +3014,7 @@ mtm_drop_node(PG_FUNCTION_ARGS)
 Datum
 mtm_add_node(PG_FUNCTION_ARGS)
 {
-	char* connStr = PG_GETARG_CSTRING(0);
+	char *connStr = text_to_cstring(PG_GETARG_TEXT_PP(0));
 
 	if (Mtm->nAllNodes == MtmMaxNodes) { 
 		elog(ERROR, "Maximal number of nodes %d is reached", MtmMaxNodes);