Last modified: 2007-03-26 12:52:14 UTC

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Bug 9103 - SQL error on SpecialProtectedPages with PostgreSQL
SQL error on SpecialProtectedPages with PostgreSQL
Status: RESOLVED FIXED
Product: MediaWiki
Classification: Unclassified
Database (Other open bugs)
unspecified
PC Linux
: Normal normal (vote)
: ---
Assigned To: Greg Sabino Mullane
:
Depends on:
Blocks: postgres
  Show dependency treegraph
 
Reported: 2007-02-25 19:14 UTC by Mathias Behrle
Modified: 2007-03-26 12:52 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Attachments

Description Mathias Behrle 2007-02-25 19:14:38 UTC
This one is similar to 9097, but IMHO too different to add it there. Running a
fresh install of 1.10A (SVN) on PostgreSQL I get the following error(s), when
entering Protected Pages in Special Pages:

A database error has occurred Query: SELECT page_id, page_restrictions.*,
page_title,page_namespace FROM page_restrictions,page WHERE
(pr_expiry>'2007-02-25 17:19:42 GMT') AND (page_id=pr_page) GROUP BY page_id
ORDER BY pr_id DESC LIMIT 51 Function: IndexPager::reallyDoQuery
(ProtectedPagesPager) Error: 1 ERROR: column "pr_id" does not exist

Backtrace:

#0 /var/www/wiki/includes/Database.php(672):
DatabasePostgres->reportQueryError('ERROR: column ...', 1, 'SELECT page_id...',
'IndexPager::rea...', false)
#1 /var/www/wiki/includes/Database.php(1068): Database->query('SELECT
page_id...', 'IndexPager::rea...')
#2 /var/www/wiki/includes/Pager.php(184): Database->select(Array, 'page_id,
page_r...', Array, 'IndexPager::rea...', Array)
#3 /var/www/wiki/includes/Pager.php(102): IndexPager->reallyDoQuery('', 51, false)
#4 /var/www/wiki/includes/Pager.php(296): IndexPager->doQuery()
#5 /var/www/wiki/includes/SpecialProtectedpages.php(27): IndexPager->getNumRows()
#6 /var/www/wiki/includes/SpecialProtectedpages.php(137):
ProtectedPagesForm->showList()
#7 /var/www/wiki/includes/SpecialPage.php(624): wfSpecialProtectedpages(NULL,
Object(SpecialPage))
#8 /var/www/wiki/includes/SpecialPage.php(430): SpecialPage->execute(NULL)
#9 /var/www/wiki/includes/Wiki.php(180): SpecialPage::executePath(Object(Title))
#10 /var/www/wiki/includes/Wiki.php(45):
MediaWiki->initializeSpecialCases(Object(Title), Object(OutputPage),
Object(WebRequest))
#11 /var/www/wiki/index.php(48): MediaWiki->initialize(Object(Title),
Object(OutputPage), Object(User), Object(WebRequest))
#12 {main}


After having created column "pr_id" the next error is:

A database error has occurred Query: SELECT page_id, page_restrictions.*,
page_title,page_namespace FROM page_restrictions,page WHERE
(pr_expiry>'2007-02-25 17:26:33 GMT') AND (page_id=pr_page) GROUP BY page_id
ORDER BY pr_id DESC LIMIT 51 Function: IndexPager::reallyDoQuery
(ProtectedPagesPager) Error: 1 ERROR: column "page_restrictions.pr_page" must
appear in the GROUP BY clause or be used in an aggregate function

Backtrace:

#0 /var/www/wiki/includes/Database.php(672):
DatabasePostgres->reportQueryError('ERROR: column ...', 1, 'SELECT page_id...',
'IndexPager::rea...', false)
#1 /var/www/wiki/includes/Database.php(1068): Database->query('SELECT
page_id...', 'IndexPager::rea...')
#2 /var/www/wiki/includes/Pager.php(184): Database->select(Array, 'page_id,
page_r...', Array, 'IndexPager::rea...', Array)
#3 /var/www/wiki/includes/Pager.php(102): IndexPager->reallyDoQuery('', 51, false)
#4 /var/www/wiki/includes/Pager.php(296): IndexPager->doQuery()
#5 /var/www/wiki/includes/SpecialProtectedpages.php(27): IndexPager->getNumRows()
#6 /var/www/wiki/includes/SpecialProtectedpages.php(137):
ProtectedPagesForm->showList()
#7 /var/www/wiki/includes/SpecialPage.php(624): wfSpecialProtectedpages(NULL,
Object(SpecialPage))
#8 /var/www/wiki/includes/SpecialPage.php(430): SpecialPage->execute(NULL)
#9 /var/www/wiki/includes/Wiki.php(180): SpecialPage::executePath(Object(Title))
#10 /var/www/wiki/includes/Wiki.php(45):
MediaWiki->initializeSpecialCases(Object(Title), Object(OutputPage),
Object(WebRequest))
#11 /var/www/wiki/index.php(48): MediaWiki->initialize(Object(Title),
Object(OutputPage), Object(User), Object(WebRequest))
#12 {main}
Comment 1 Rob Church 2007-02-25 19:16:36 UTC
Another schema breakage from Werdna...
Comment 2 Aaron Schulz 2007-02-25 19:35:09 UTC
The PostgreSQL initial query is incomplete, it lacks pr_id and the sequence. Try
dropping the page_restrictions table and running the following query perhaps:

CREATE SEQUENCE pr_id_val;
CREATE TABLE page_restrictions (
  pr_id      INTEGER  NOT NULL  PRIMARY KEY DEFAULT nextval('pr_id_val'),
  pr_page    INTEGER          NULL  REFERENCES page (page_id) ON DELETE CASCADE,
  pr_type    TEXT         NOT NULL,
  pr_level   TEXT         NOT NULL,
  pr_cascade SMALLINT     NOT NULL,
  pr_user    INTEGER          NULL,
  pr_expiry  TIMESTAMPTZ      NULL
);

Currently we have an ALTER query afterwords:

ALTER TABLE page_restrictions ADD CONSTRAINT page_restrictions_pk PRIMARY KEY
(pr_page,pr_type);

Though I am not sure why that contraint is added to PostgreSQL schemas while no
pr_id is added.
Comment 3 Aaron Schulz 2007-02-25 19:52:32 UTC
Fixed in r20053.
Comment 4 Mathias Behrle 2007-02-25 20:33:06 UTC
Thanks for looking into it, but it is not yet fixed:

1)
You forgot to put column
    pr_pagetype text
in tables.sql

2)
with above mentionned column added it is possible to protect pages, but going to
SpecialPages:Protected Pages gives now:

A database error has occurred Query: SELECT page_id, page_restrictions.*,
page_title,page_namespace FROM page_restrictions,page WHERE
(pr_expiry>'2007-02-25 20:28:58 GMT') AND (page_id=pr_page) GROUP BY page_id
ORDER BY pr_id DESC LIMIT 51 Function: IndexPager::reallyDoQuery
(ProtectedPagesPager) Error: 1 ERROR: column "page_restrictions.pr_id" must
appear in the GROUP BY clause or be used in an aggregate function

Backtrace:

#0 /var/www/wiki/includes/Database.php(677):
DatabasePostgres->reportQueryError('ERROR: column ...', 1, 'SELECT page_id...',
'IndexPager::rea...', false)
#1 /var/www/wiki/includes/Database.php(1073): Database->query('SELECT
page_id...', 'IndexPager::rea...')
#2 /var/www/wiki/includes/Pager.php(184): Database->select(Array, 'page_id,
page_r...', Array, 'IndexPager::rea...', Array)
#3 /var/www/wiki/includes/Pager.php(102): IndexPager->reallyDoQuery('', 51, false)
#4 /var/www/wiki/includes/Pager.php(296): IndexPager->doQuery()
#5 /var/www/wiki/includes/SpecialProtectedpages.php(27): IndexPager->getNumRows()
#6 /var/www/wiki/includes/SpecialProtectedpages.php(137):
ProtectedPagesForm->showList()
#7 /var/www/wiki/includes/SpecialPage.php(624): wfSpecialProtectedpages(NULL,
Object(SpecialPage))
#8 /var/www/wiki/includes/SpecialPage.php(430): SpecialPage->execute(NULL)
#9 /var/www/wiki/includes/Wiki.php(180): SpecialPage::executePath(Object(Title))
#10 /var/www/wiki/includes/Wiki.php(45):
MediaWiki->initializeSpecialCases(Object(Title), Object(OutputPage),
Object(WebRequest))
#11 /var/www/wiki/index.php(48): MediaWiki->initialize(Object(Title),
Object(OutputPage), Object(User), Object(WebRequest))
#12 {main}
Comment 5 Aaron Schulz 2007-02-25 20:45:00 UTC
1) pr_pagetype is bug 9097, I'll see if I can look at that later.

2) see http://archives.postgresql.org/pgsql-general/2004-02/msg01199.php

It seems like this could occure with pr_id values that are the same, but since
the query should list it as UNIQUE, that should not happen. Did you view your
table, is this the case? If not, I suppose we can use max(pr_id) or DISTINCT ON,
but it still seems odd.
Comment 6 Greg Sabino Mullane 2007-03-18 00:40:37 UTC
I'm still not quite clear on why we are using pr_id at all. If it's merely to
allow the display to order by time added, why not make the new column a
timestamp field instead? (The table already has a primary key).
Comment 7 Andrew Garrett 2007-03-18 01:24:20 UTC
(In reply to comment #6)
> I'm still not quite clear on why we are using pr_id at all. If it's merely to
> allow the display to order by time added, why not make the new column a
> timestamp field instead? (The table already has a primary key).

Because the field was introduced AFTER the table was first created; and I didn't
want to necessitate pre-filling a timestamp field with bogus data. With pr_id,
SQL (mysql, at least) pre-filled the data field with autonumbering when the
update was first run.

In retrospect, I could have run IN the updater 'UPDATE page_restrictions SET
pr_timestamp=CURRENT_TIMESTAMP', but I don't see the point in changing this now.

Unassigning. I don't have time to sort this out at the moment - my academic work
takes priority over volunteer development.
Comment 8 Greg Sabino Mullane 2007-03-18 01:40:38 UTC
Thanks for the explanation, that makes sense. I'll see if I can figure out
exactly what the page is trying to show and modify it for Postgres next.
Comment 9 Greg Sabino Mullane 2007-03-19 14:58:30 UTC
Fixed in 20560, although it may have to be separated for mysql optimization, so
not resolving this yet.
Comment 10 Greg Sabino Mullane 2007-03-26 01:59:29 UTC
Hearing no objections, marking this as resolved.
Comment 11 Mathias Behrle 2007-03-26 11:17:03 UTC
Reopening since it not seems to be (completely?) resolved:
To avoid the error it is necessary to have a column pr_id in table
page_restrictions. AFAIS this is now contained in
/wiki/maintenance/mysql5/tables.sql as   
  -- Field for an ID for this restrictions row (sort-key for
Special:ProtectedPages)                                                        
                                                 
  pr_id int unsigned NOT NULL auto_increment

but it is not in /wiki/maintenance/postgres/tables.sql .

The definition would be:
ALTER TABLE page_restrictions ADD COLUMN pr_id int4;
ALTER TABLE page_restrictions ALTER COLUMN pr_id SET STORAGE PLAIN;
ALTER TABLE page_restrictions ALTER COLUMN pr_id SET NOT NULL;
ALTER TABLE page_restrictions ALTER COLUMN pr_id SET DEFAULT
nextval('page_restrictions_pr_id_seq'::regclass);

and is working for me this way.
Comment 12 Greg Sabino Mullane 2007-03-26 12:41:02 UTC
> To avoid the error it is necessary to have a column pr_id in table
...
> but it is not in /wiki/maintenance/postgres/tables.sql .

Sure it is, line 116. Added as of comment #3 above.

Comment 13 Mathias Behrle 2007-03-26 12:52:14 UTC
You are right, sorry for the noise!

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