Yang Jiandan comments

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                                            Yang Jiandan

FileNotFoundError: [Errno 2] No such file or directory: 'D:\\dev\\shm\\tmpolgxfn9p'

update checkpoint.py:50 may fix this error - tmp_dir = "/dev/shm/" + tmp_dir = "/tmp/shm/"

No such a directory 'Dev'

update checkpoint.py:50 may fix this error tmp_dir = "/dev/shm/" --> tmp_dir = "your exist dir"

HIVE-25351: stddev(), stddev_pop() with CBO enable returning null

Hi, @vineetgarg02, could you please review my merge request? I would appreciate your feedback on the change. thank you!

HIVE-25351: stddev(), stddev_pop() with CBO enable returning null

Hi, @deniskuzZ sorry for the late response! Yes, I do plan to continue working on this PR and will update soon. Thanks for your patient!

HIVE-25351: stddev(), stddev_pop() with CBO enable returning null

@deniskuzZ current master branch may have problem. when I run the following cmd under master branch with any code changing, it throws exception. my command: ``` mvn test -Dtest=TestMiniLlapLocalCliDriver -Dqfile=stddev_variance_with_double_decimal_test.q...