diff --git a/src/test/regress/expected/rpt_joins.out b/src/test/regress/expected/rpt_joins.out
index 9a96e8132c0..6896b8a092c 100644
--- a/src/test/regress/expected/rpt_joins.out
+++ b/src/test/regress/expected/rpt_joins.out
@@ -2376,6 +2376,12 @@ explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) retur
  Optimizer: Postgres query optimizer
 (10 rows)
 
+-- start_ignore
+-- When external_fts is on
+-- Seq scan on gp_segment_configuration would be replaced by 
+-- Function Scan on gp_get_segment_configuration 
+-- Inconsistence between CIs will cause such cases to fail.
+-- Ignore these as workaround.
 -- Replicate join Entry.
 explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) returning *) select * from cte1 join gp_segment_configuration g on g.dbid = cte1.c1;
                           QUERY PLAN                           
@@ -2390,6 +2396,7 @@ explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) retur
  Optimizer: Postgres query optimizer
 (8 rows)
 
+-- end_ignore
 --
 -- Begin of Replicated join Partitioned.
 --
diff --git a/src/test/regress/sql/rpt_joins.sql b/src/test/regress/sql/rpt_joins.sql
index de2c31dbe86..bd1ba37371a 100644
--- a/src/test/regress/sql/rpt_joins.sql
+++ b/src/test/regress/sql/rpt_joins.sql
@@ -502,8 +502,15 @@ explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) retur
 explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) returning *) select * from cte1 right join (select count(*) as c from hash_issue_15860) a on a.c = cte1.c1;
 explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) returning *) select * from cte1 full join (select count(*) as c from hash_issue_15860) a on a.c = cte1.c1;
 
+-- start_ignore
+-- When external_fts is on
+-- Seq scan on gp_segment_configuration would be replaced by 
+-- Function Scan on gp_get_segment_configuration 
+-- Inconsistence between CIs will cause such cases to fail.
+-- Ignore these as workaround.
 -- Replicate join Entry.
 explain(costs off) with cte1 as (insert into rpt_issue_15860 values (1, 2) returning *) select * from cte1 join gp_segment_configuration g on g.dbid = cte1.c1;
+-- end_ignore
 
 --
 -- Begin of Replicated join Partitioned.