V9 only can return 1 result using LDAP for impala query

1 enabled ldap for impala query.
the same path with docker-compose.yml,create env file:

REDASH_LDAP_LOGIN_ENABLED=true
REDASH_LDAP_URL=ldap://xxx.xxx.xxx.xxx
REDASH_LDAP_BIND_DN=OU=People,DC=xxx,DC=com
REDASH_LDAP_SEARCH_TEMPLATE=(cn=%(username)s)
REDASH_LDAP_SEARCH_DN=OU=People,DC=xxx,DC=com

2 After restart docker, redash connection test is OK.

3 creating query : it will get correct result limit 1 record

if limit > 2 ,it alway executing …

mostly, i think redash impala python api not support impla query well, any suggestion?

my python version:3.7.4 impala version: 3.2.0-cdh6.3.1