BUG #17153: tpch-hammerdb-Query21

The following bug has been logged on the website:

Bug reference:      17153
Logged by:          bommareddy
Email address:      anilbommareddy09@gmail.com
PostgreSQL version: 13.3
Operating system:   RHEL8.3
Description:

In PostgreSQL13.3 , tried to run tpch with Hammedb benchmark environment .
Observed Q17,Q20, Q21 executed long period time .
Q17--->5000 seconds
Q20--->6124 seconds
Q21--->53271 seconds.
the issue was may not observe with pervious/older PostgreSQL version like
12.x
Run the following commands in sequence to load data
Hammerdb4.x]./hammerdbcli
>dbset db pg #Configure the database type.

>dbset bm tpc-h #Configure the test model.

>diset connection pg_host localhost #Configure the database service
address.

>diset tpch pg_tpch_superuser gpadmin #Configures the database superuser.

>diset tpch pg_tpch_superuserpass 123456 #Configures the database superuser
password.

>diset tpch pg_tpch_defaultdbase postgres #Configures the default superuser
database

>diset tpch pg_scale_fact 1 #Configure data volume. The default value is
1.

>diset tpch pg_num_tpch_threads 30 #Configure the number of concurrent
threads.

>diset tpch pg_tpch_gpcompat true #Enable Greenplum-compatibility.

>diset tpch pg_tpch_gpcompress true #Enable Greenplum parameters.
>buildschema

"ALL VIRTUAL USERS COMPLETE" is returned, indicating that the data is
imported successfully.

Perform the test. in hammerdbcli
>vuset vu 1 #Configure the number of concurrent tasks.
>vuset showoutput 1 #Enable the log function.
>vuset logtotemp 1 #Enable the function of automatically saving logs to the
/tmp directory.
>vuset unique 1 #Configure log uniqueness, that is, logs are not
overwritten.
>print vuconf ##View the task configuration
Create a database on the database server and create a table based on the
test
model. You can view the OLAP test script in "src/postgresql/pgolap.tcl" in
the
HammerDB installation path