Re: [patch] Proposal for \rotate in psql

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От Pavel Stehule
Тема Re: [patch] Proposal for \rotate in psql
Дата
Msg-id CAFj8pRC-HwTEJ=fjf9bcN03agfsST+wN+Zdvqp74dxm9JcUvqQ@mail.gmail.com
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Ответ на Re: [patch] Proposal for \rotate in psql  (Pavel Stehule <pavel.stehule@gmail.com>)
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2015-12-17 21:33 GMT+01:00 Pavel Stehule <pavel.stehule@gmail.com>:


2015-12-14 23:09 GMT+01:00 Daniel Verite <daniel@manitou-mail.org>:
        Pavel Stehule wrote:

> postgres=# \crosstabview 4 +month label
>
> Maybe using optional int order column instead label is better - then you can
> do sort on client side
>
> so the syntax can be "\crosstabview VCol [+/-]HCol [[+-]HOrderCol]

In the meantime I've followed a different idea: allowing the
vertical header to be sorted too, still server-side.

That's because to me, the first impulse for a user noticing that
it's not sorted vertically would be to write
 \crosstabview +customer month
rather than figure out the
 \crosstabview customer +month_number month_name
invocation.
But both ways aren't even mutually exclusive. We could support
 \crosstabview [+|-]colV[:labelV] [+|-]colH[:labelH]
it's more complicated to understand, but not  harder to implement.

Also, a non-zero FETCH_COUNT is supported by this version of the patch,
if the first internal FETCH retrieves less than FETCH_COUNT rows.
Otherwise a specific error is emitted.

Also there are minor changes in arguments and callers following
recent code changes for \o

Trying to crosstab with 10k+ distinct values vertically, I've noticed
that the current code is too slow, spending too much time
sorting.  I'm currently replacing its simple arrays of distinct values
with AVL binary trees, which I expect to be much more efficient for
this.

I played with last version and it is looking well. I have only one notice, but it is subjective - so can be ignored if you don't like it.

The symbol 'X' in two column mode should be centred - now it is aligned to left, what is not nice. For unicode line style I prefer some unicode symbol - your chr(10003) is nice.


I checked code and I have only one note. The name "sortColumns" is not valid now, and it isn't well - maybe ServerSideSort or some similar can be better. The error message "Unexpected value when sorting horizontal headers" is obsolete too.

Regards

Pavel


 
Regards

Pavel

 

Best regards,
--
Daniel Vérité
PostgreSQL-powered mailer: http://www.manitou-mail.org
Twitter: @DanielVerite


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