GridDB_Python - unable to get row count on griddb table

Question

I'm trying to write and read large data on griddb using python, and I'll try it first for small data. But when I wanted to calculate the row count, I failed to get it, even though I had tried several variations. Here's my code snippet:

import griddb_python

def create_griddb_connection():
    factory = griddb_python.StoreFactory.get_instance()
    return factory.get_store(host='127.0.0.1', port=10001, cluster_name='myCluster', username='admin', password='admin')

def get_container(store, container_name):
    desc = griddb_python.ContainerInfo(
        name=container_name,
        column_info_list=[
            ["id", griddb_python.Type.INTEGER],
            ["data", griddb_python.Type.STRING]
        ],
        type=griddb_python.ContainerType.COLLECTION
    )
    container = store.put_container(desc)
    return container

def write_data(container, num_records=1000):
    for i in range(num_records):
        data = [i, f"data_{i}"]
        container.put(data)

    print(f"Write {num_records} data completed")

def read_data(container, container_name):
    sqlSelect = f"SELECT * FROM {container_name} limit 1"
    query = container.query(sqlSelect)
    result = query.fetch()
    if result.has_next():
        row = result.next()
        print (f"First row data: [{row[0]}-{row[1]}]")
    else:
        print("No rows")

    sqlSelect = f"SELECT COUNT(*) FROM {container_name}"
    query = container.query(sqlSelect)
    result = query.fetch()
    if result.has_next():
        row = result.next()
        #print (f"Row count:{row[0]}")
        #print (f"Row count:{row.getvalue(0)}")
        #print (f"Row count:{row.get(0)}")
    else:
        print("No rows")

    result.close()
    query.close()

def main():
    store = create_griddb_connection()    
    container_name = "test_container"

    container = get_container(store, container_name)
    write_data(container, num_records=1000)
    read_data(container, container_name)

    container.close()
    store.close()

if __name__ == "__main__":
    main()

When I executed it without "SELECT COUNT", it is successful with the output:

Write 1000 data completed
First row data: [0-data_0]

But when I uncommented the print command on "SELECT COUNT", it produces error with the following error message:

print (f"Row count:{row[0]}") produces error: 'AggregationResult' object is not subscriptable

print (f"Row count:{row.getvalue(0)}") produces error: 'AggregationResult' object has no attribute 'getvalue'

print (f"Row count:{row.get(0)}") produces error: griddb_python.GSException

When I detailed the error message, with this code snippet:

try:
    row = result.next()
    print (f"Row count:{row.get(0)}")
except Exception as e:
    for i in range(e.get_error_stack_size()):
        print("[", i, "]")
        print(e.get_error_code(i))
        print(e.get_message(i))

It produces an error message: [140037:CC_NO_SUCH_ELEMENT]

Has anyone experienced something similar?