diff --git a/src/backend/executor/nodeGatherMerge.c b/src/backend/executor/nodeGatherMerge.c
index 9a81e22..64c6239 100644
--- a/src/backend/executor/nodeGatherMerge.c
+++ b/src/backend/executor/nodeGatherMerge.c
@@ -334,6 +334,7 @@ ExecReScanGatherMerge(GatherMergeState *node)
 	ExecShutdownGatherMergeWorkers(node);
 
 	node->initialized = false;
+	node->gm_initialized = false;
 
 	if (node->pei)
 		ExecParallelReinitialize(node->pei);
diff --git a/src/test/regress/expected/select_parallel.out b/src/test/regress/expected/select_parallel.out
index 0efb211..fbce71c 100644
--- a/src/test/regress/expected/select_parallel.out
+++ b/src/test/regress/expected/select_parallel.out
@@ -300,6 +300,52 @@ select count(*) from tenk1 group by twenty;
    500
 (20 rows)
 
+--test rescan behavior of gather merge
+set min_parallel_index_scan_size=0;
+set enable_gather=off;
+set enable_material=off;
+set enable_seqscan=off;
+set enable_bitmapscan=off;
+set cpu_tuple_cost=0.05;
+explain (costs off)
+	select count(tenk1.hundred) from
+	tenk1 right join (values (1,100), (2,200)) as t (two, hundred) on
+	t.two > 1 and tenk1.hundred > 95 group by tenk1.hundred order by
+	tenk1.hundred;
+                                  QUERY PLAN                                   
+-------------------------------------------------------------------------------
+ GroupAggregate
+   Group Key: tenk1.hundred
+   ->  Sort
+         Sort Key: tenk1.hundred
+         ->  Nested Loop Left Join
+               Join Filter: ("*VALUES*".column1 > 1)
+               ->  Values Scan on "*VALUES*"
+               ->  Gather Merge
+                     Workers Planned: 4
+                     ->  Parallel Index Only Scan using tenk1_hundred on tenk1
+                           Index Cond: (hundred > 95)
+(11 rows)
+
+select count(tenk1.hundred) from
+tenk1 right join (values (1,100), (2,200)) as t (two, hundred) on
+t.two > 1 and tenk1.hundred > 95 group by tenk1.hundred order by
+tenk1.hundred;
+ count 
+-------
+   100
+   100
+   100
+   100
+     0
+(5 rows)
+
+reset min_parallel_index_scan_size;
+reset enable_gather;
+reset enable_material;
+reset enable_seqscan;
+reset enable_bitmapscan;
+reset cpu_tuple_cost;
 -- gather merge test with 0 worker
 set max_parallel_workers = 0;
 explain (costs off)
diff --git a/src/test/regress/sql/select_parallel.sql b/src/test/regress/sql/select_parallel.sql
index e717f92..ad73d87 100644
--- a/src/test/regress/sql/select_parallel.sql
+++ b/src/test/regress/sql/select_parallel.sql
@@ -118,6 +118,32 @@ explain (costs off)
 
 select count(*) from tenk1 group by twenty;
 
+--test rescan behavior of gather merge
+set min_parallel_index_scan_size=0;
+set enable_gather=off;
+set enable_material=off;
+set enable_seqscan=off;
+set enable_bitmapscan=off;
+set cpu_tuple_cost=0.05;
+
+explain (costs off)
+	select count(tenk1.hundred) from
+	tenk1 right join (values (1,100), (2,200)) as t (two, hundred) on
+	t.two > 1 and tenk1.hundred > 95 group by tenk1.hundred order by
+	tenk1.hundred;
+
+select count(tenk1.hundred) from
+tenk1 right join (values (1,100), (2,200)) as t (two, hundred) on
+t.two > 1 and tenk1.hundred > 95 group by tenk1.hundred order by
+tenk1.hundred;
+
+reset min_parallel_index_scan_size;
+reset enable_gather;
+reset enable_material;
+reset enable_seqscan;
+reset enable_bitmapscan;
+reset cpu_tuple_cost;
+
 -- gather merge test with 0 worker
 set max_parallel_workers = 0;
 explain (costs off)