fix test

src/test/regress/input/dispatch.source

@@ -575,10 +575,6 @@ set optimizer=off;
 --gang reused
 create table t_create_gang_time(tc1 int,tc2 int);
 
---1-gang reused
-select * from t_create_gang_time where tc1=1;
-explain analyze select * from t_create_gang_time where tc1=1;
-
 --n-gang reused and 1-gang is created.
 select * from t_create_gang_time t1, t_create_gang_time t2 where t1.tc1=2;
 

src/test/regress/output/dispatch.source

@@ -933,28 +933,6 @@ create table t_create_gang_time(tc1 int,tc2 int);
 NOTICE:  Table doesn't have 'DISTRIBUTED BY' clause -- Using column named 'tc1' as the Greenplum Database data distribution key for this table.
 HINT:  The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew.
 INFO:  (Gang) is reused
---1-gang reused
-select * from t_create_gang_time where tc1=1;
-INFO:  (Slice1) The shortest establish conn time: 4.80 ms, segindex: 0,
-                The longest  establish conn time: 4.80 ms, segindex: 0,
- tc1 | tc2 
------+-----
-(0 rows)
-
-explain analyze select * from t_create_gang_time where tc1=1;
-INFO:  (Slice1) is reused
-                                                       QUERY PLAN                                                        
--------------------------------------------------------------------------------------------------------------------------
- Gather Motion 1:1  (slice1; segments: 1)  (cost=0.00..393.90 rows=86 width=8) (actual time=0.611..0.618 rows=0 loops=1)
-   ->  Seq Scan on t_create_gang_time  (cost=0.00..392.75 rows=29 width=8) (never executed)
-         Filter: (tc1 = 1)
- Optimizer: Postgres query optimizer
- Planning Time: 0.187 ms
-   (slice0)    Executor memory: 36K bytes.
-   (slice1)    Executor memory: 36K bytes (seg1).
- Memory used:  128000kB
- Execution Time: 1.249 ms
-(9 rows)
 
 --n-gang reused and 1-gang is created.
 select * from t_create_gang_time t1, t_create_gang_time t2 where t1.tc1=2;