Re: list of extended statistics on psql

Hi Tomas,

On 2021/01/12 20:08, Tomas Vondra wrote:
>
> On 1/12/21 2:57 AM, Tatsuro Yamada wrote:
>> Hi Tomas,
>>
>> On 2021/01/09 9:01, Tomas Vondra wrote:
> ...>
>>> While working on that, I realized that 'defined' might be a bit
>>> ambiguous, I initially thought it means 'NOT NULL' (which it does not).
>>> I propose to change it to 'requested' instead. Tatsuro, do you agree, or
>>> do you think 'defined' is better?
>>
>> Regarding the status of extended stats, I think the followings:
>>
>>   - "defined": it shows the extended stats defined only. We can't know
>>                whether it needs to analyze or not. I agree this name was
>>                 ambiguous. Therefore we should replace it with a more suitable
>>                name.
>>   - "requested": it shows the extended stats needs something. Of course,
>>                we know it needs to ANALYZE because we can create the patch.
>>                However, I feel there is a little ambiguity for DBA.
>>                To solve this, it would be better to write an explanation of
>>                the status in the document. For example,
>>
>> ======
>> The column of the kind of extended stats (e. g. Ndistinct) shows some statuses.
>> "requested" means that it needs to gather data by ANALYZE. "built" means ANALYZE
>>   was finished, and the planner can use it. NULL means that it doesn't exists.
>> ======
>>
>> What do you think? :-D
>>
>
> Yes, that seems reasonable to me. Will you provide an updated patch?

Sounds good. I'll send the updated patch today.

Thanks,
Tatsuro Yamada