GridDB Python执行Group By聚合查询时遭遇语法错误的问题求助

最近我在一个项目里重新调研GridDB，现在需要做数据聚合操作，参考了官方的SQL语法指引来写查询语句，但试了好多次，不管是用常规的GROUP BY还是GROUP BY RANGE做聚合查询，都会报错。

先给大家看看我能正常运行的简单查询代码：

TABLE_NAME = "sensor_test_01"

conInfo = griddb.ContainerInfo(
    name=TABLE_NAME,
    column_info_list=[
        ["timestamp", griddb.Type.TIMESTAMP],
        ["sensor_id", griddb.Type.STRING],
        ["temperature", griddb.Type.DOUBLE],
        ["humidity", griddb.Type.DOUBLE]
    ],
    type=griddb.ContainerType.TIME_SERIES,
    row_key=True
)

ts = gridstore.put_container(conInfo)

query = ts.query("select * from "+TABLE_NAME+" limit 5")
try:
    rs = query.fetch(False)
    while rs.has_next():
        data = rs.next()
        print(data)
except griddb.GSException as e:
    for i in range(e.get_error_stack_size()):
        print("[", i, "]")
        print(e.get_error_code(i))
        print(e.get_message(i))

这段代码完全没问题，能成功打印出表中的前5条数据。

接下来是出问题的聚合查询代码：

# query = ts.query("select timestamp, avg(temperature) as temperature from "+TABLE_NAME+" GROUP BY RANGE timestamp EVERY (20,SECOND)")
query = ts.query("select sensor_id, avg(temperature) as temperature from "+TABLE_NAME+" GROUP BY sensor_id")
try:
    rs = query.fetch(False)
    while rs.has_next():
        data = rs.next()
        print(data)
except griddb.GSException as e:
    for i in range(e.get_error_stack_size()):
        print("[", i, "]")
        print(e.get_error_code(i))
        print(e.get_message(i))

不管是注释掉的那条用GROUP BY RANGE的语句，还是下面常规GROUP BY sensor_id的语句，执行时都会抛出语法错误，错误信息如下：

[151001:TQ_SYNTAX_ERROR_EXECUTION] Syntax error during parse

有没有小伙伴遇到过类似的问题，或者知道怎么解决吗？

备注：内容来源于stack exchange，提问作者dede kyuti