Re: Problem with displaying "wide" tables in psql

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От	Sergey Muraviov
Тема	Re: Problem with displaying "wide" tables in psql
Дата	5 декабря 2013 г. 09:09:56
Msg-id	CAJTaR32tcH6R3i1sB=uM0GycfcYHa4P0T4iVNc0dQn2Q-Wf9Tw@mail.gmail.com обсуждение исходный текст
Ответ на	Re: Problem with displaying "wide" tables in psql (Pavel Stehule <pavel.stehule@gmail.com>)
Ответы	Re: Problem with displaying "wide" tables in psql
Список	pgsql-hackers

Дерево обсуждения

And my patch affects the row view only.

postgres=# \x 1

postgres=# create table wide_table (value text);

postgres=# insert into wide_table values ('afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfsadfasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf');

postgres=# insert into wide_table values ('afadsafasd fasdf asdfasd');

postgres=# select * from wide_table;

-[ RECORD 1 ]-------------------------------------------------------------------

-------------------------------------------------------------------

value | afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfsad

fasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf

-[ RECORD 2 ]-------------------------------------------------------------------

-------------------------------------------------------------------

value | afadsafasd fasdf

If we add a new column to this table and put the border on, we can see that all values in the table have the same width.

postgres=# alter table wide_table add column id integer;

postgres=# \pset border 2

postgres=# select * from wide_table;

+-[ RECORD 1 ]------------------------------------------------------------------

----------------------------------------------------------------------+

| value | afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfs

adfasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf |

| id |

+-[ RECORD 2 ]------------------------------------------------------------------

----------------------------------------------------------------------+

| value | afadsafasd fasdf asdfasd

| id |

+-------+-----------------------------------------------------------------------

----------------------------------------------------------------------+

My patch tries to solve these problems:

-[ RECORD 1 ]-------------------------------------------------------------------

value | afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfsad

fasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf

-[ RECORD 2 ]-------------------------------------------------------------------

value | afadsafasd fasdf asdfasd

and

+-[ RECORD 1 ]-----------------------------------------------------------------+

| value | afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfs

adfasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf |

| id | |

+-[ RECORD 2 ]-----------------------------------------------------------------+

| value | afadsafasd fasdf asdfasd |

| id | |

+-------+----------------------------------------------------------------------+

Regards

2013/12/4 Pavel Stehule <pavel.stehule@gmail.com>

Hello

postgres=# \pset format wrapped
Output format (format) is wrapped.
postgres=# select 'afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfsadfasd fsad fsa df sadf asd fa sfd sadfsadf asdf sad f sadf sad fadsf';
?column?
---------------------------------------------------------------------------------------------------------------------
afadsafasd fasdf asdfasd fsad fas df sadf sad f sadf sadf sa df sadfsadfasd fsad fsa df sadf asd fa sfd sadfsadf a.
.sdf sad f sadf sad fadsf
(1 row)

It works as expected

but it is not supported for row view. So any fix of this mode should be nice

Regards

Pavel

2013/12/4 Sergey Muraviov <sergey.k.muraviov@gmail.com>
Thank you for this trick.
It would be nice if this trick was documented.

However, with the pager I can't see wide value on one screen, select and copy it entirely.
And I have to press many keys to find the necessary part of the value.
There is no such problems with the patch.

2013/12/3 Pavel Stehule <pavel.stehule@gmail.com>
Hello

do you know a pager less trick

http://merlinmoncure.blogspot.cz/2007/10/better-psql-with-less.html

Regards

Pavel Stehule

2013/12/3 Sergey Muraviov <sergey.k.muraviov@gmail.com>
Hi.

Psql definitely have a problem with displaying "wide" tables.
Even in expanded mode, they look horrible.
So I tried to solve this problem.

Before the patch:
postgres=# \x 1
Expanded display (expanded) is on.
postgres=# \pset border 2
Border style (border) is 2.
postgres=# select * from pg_stats;

+-[ RECORD 1 ]-----------+------------------------------------------------------
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----------------------------------------------------------+
| schemaname | pg_catalog

|
| tablename | pg_proc
...

and after:

+-[ RECORD 1 ]-----------+-----------------------------------------------------+
| schemaname | pg_catalog |
| tablename | pg_proc |
| attname | proname |
| inherited | f |
| null_frac | 0 |
| avg_width | 64 |
| n_distinct | -0.823159 |
| most_common_vals | {max,min,overlaps,has_column_privilege,date_part,int4
,length,substring,sum,to_char,avg,int8,numeric,abs,generate_series,has_any_colum
n_privilege,has_database_privilege,has_foreign_data_wrapper_privilege,has_functi
on_privilege,has_language_privilege,has_schema_privilege,has_sequence_privilege,
has_server_privilege,has_table_privilege,has_tablespace_privilege,has_type_privi
lege,overlay,pg_has_role,point,stddev,stddev_pop,stddev_samp,text,time,timestamp
tz,timezone,var_pop,var_samp,variance,age,float4,float8,int2,isfinite,pg_get_vie
wdef,timestamp,bit_and,bit_or,mod,octet_length,polygon,substr,trunc,ts_headline,
ts_rank,ts_rank_cd,area,bit,bit_length,box,bpchar,btrim,circle,date,date_trunc,i
nterval,ishorizontal,isvertical,lag,lead,like,log,money,name,notlike,position,ro
und,timetz,to_ascii,abbrev,abstime,array_fill,array_to_json,array_to_string,ceil
,ceiling,center,char,char_length,character_length,count,daterange,enum_range,exp
,floor,format,generate_subscripts,get_bit,gin_extract_tsquery,gin_extract_tsvect
or} |
...
| correlation | 0.254019 |
| most_common_elems | |
| most_common_elem_freqs | |
| elem_count_histogram | |
+-[ RECORD 2 ]-----------+-----------------------------------------------------+
| schemaname | pg_catalog |
| tablename | pg_proc |
| attname | pronamespace |
| inherited | f |
| null_frac | 0 |
| avg_width | 4 |
| n_distinct | 2 |
| most_common_vals | {11,12410} |
| most_common_freqs | {0.995274,0.00472627} |
| histogram_bounds | |
| correlation | 1 |
| most_common_elems | |
| most_common_elem_freqs | |
| elem_count_histogram | |
+-[ RECORD 3 ]-----------+-----------------------------------------------------+

Best regards,
Sergey Muraviov

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Best regards,
Sergey Muraviov

Best regards,

Sergey Muraviov

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