fetch more pages for long-running queries

[wolfv]

No description provided.

[hantmac]

@wolfv Thanks for your contribution! Could you describe the specific problem that you encountered? There already has a generator for long-running queries which will query pages until next_uri is None. The code you can check here https://github.com/databendcloud/databend-py/blob/main/databend_py/client.py#L39.

[hantmac]

Hi, I found the problem. There has a situation: the data in the query process may be empty, but the next_uri is not empty. So we fetch pages until the next_url is None. You can the the bug-fix in this pr

[wolfv]

Sorry I wasn't explaining the issue very well! I have a long running query and I got some empty results. I checked and I can get results after calling the next uri

[hantmac]

Yes, #7 this pr fix the bug. So I close this pr and open it anytime if you have any question.