Bruce Momjian [Thu, 16 Dec 1999 20:07:41 +0000 (20:07 +0000)]
>Turning nextval and currval into keywords is not an acceptable way to
>go about this. That will risk breaking existing applications that use
>those names as column names.
>
>It should actually almost work to write sq.nextval as things stand,
>because Postgres has for a long time considered table.function and
>function(table) to be interchangeable notations for certain kinds of
>functions. nextval doesn't seem to be one of that kind of function,
>at the moment. I'd suggest leaving the grammar as it was, and taking a
>look at ParseFuncOrColumn in parse_func.c to see if you can't persuade
>it to accept the sequence functions in that style.
OK, good point. I tried to implement it somewhere else and ended up
extending transformAttr. Attached you'll find the patch.
Bruce Momjian [Thu, 16 Dec 1999 17:24:19 +0000 (17:24 +0000)]
Here's the Create/Alter/Drop Group stuff that's been really overdue. I
didn't have time for documentation yet, but I'll write some. There are
still some things to work out what happens when you alter or drop users,
but the group stuff in and by itself is done.
Bruce Momjian [Thu, 16 Dec 1999 01:30:49 +0000 (01:30 +0000)]
Ethernet MAC addresses (macaddr type) are not compared correctly for
equality. The lobits macro is wrong and extracts the wrong set of
bits out of the structure.
To exhibit the problem:
select '000000:000000'::macaddr = '000000:110000'::macaddr ;
?column?
--------
t
(1 row)
Bruce Momjian [Thu, 16 Dec 1999 01:25:23 +0000 (01:25 +0000)]
I have done the QNX4 port with the current source tree. The number of
backend/Makefiles to be patched could significantly be reduced since
they
have been adopted to the QNX4 needs.
Bruce Momjian [Tue, 14 Dec 1999 00:08:21 +0000 (00:08 +0000)]
Depending on my interpreting (and programming) skills, this might solve
anywhere from zero to two TODO items.
* Allow flag to control COPY input/output of NULLs
I got this:
COPY table .... [ WITH NULL AS 'string' ]
which does what you'd expect. The default is \N, otherwise you can use
empty strings, etc. On Copy In this acts like a filter: every data item
that looks like 'string' becomes a NULL. Pretty straightforward.
This also seems to be related to
* Make postgres user have a password by default
If I recall this discussion correctly, the problem was actually that the
default password for the postgres (or any) user is in fact "\N", because
of the way copy is used. With this change, the file pg_pwd is copied out
with nulls as empty strings, so if someone doesn't have a password, the
password is just '', which one would expect from a new account. I don't
think anyone really wants a hard-coded default password.
Tom Lane [Mon, 13 Dec 1999 17:39:38 +0000 (17:39 +0000)]
Update documentation to reflect availability of aggregate(DISTINCT).
Try to provide a more lucid discussion in 'Using Aggregate Functions'
tutorial section.
Bruce Momjian [Sun, 12 Dec 1999 05:57:36 +0000 (05:57 +0000)]
I'm in TODO mood today ...
* Document/trigger/rule so changes to pg_shadow recreate pg_pwd
I did it with a trigger and it seems to work like a charm. The function
that already updates the file for create and alter user has been made a
built-in "SQL" function and a trigger is created at initdb time.
Comments around the pg_pwd updating function seem to be worried about
this
routine being called concurrently, but I really don't see a reason to
worry about this. Verify for yourself. I guess we never had a system
trigger before, so treat this with care, and feel free to adjust the
nomenclature as well.
Bruce Momjian [Sun, 12 Dec 1999 05:15:10 +0000 (05:15 +0000)]
Meanwhile, database names with single quotes in names don't work very well
at all, and because of shell quoting rules this can't be fixed, so I put
in error messages to that end.
Also, calling create or drop database in a transaction block is not so
good either, because the file system mysteriously refuses to roll back rm
calls on transaction aborts. :) So I put in checks to see if a transaction
is in progress and signal an error.
Also I put the whole call in a transaction of its own to be able to roll
back changes to pg_database in case the file system operations fail.
The alternative location issues I posted recently were untouched, awaiting
the outcome of that discussion. Other than that, this should be much more
fool-proof now.
Tom Lane [Fri, 10 Dec 1999 07:37:35 +0000 (07:37 +0000)]
Teach grammar and parser about aggregate(DISTINCT ...). No implementation
yet, but at least we can give a better error message:
regression=> select count(distinct f1) from int4_tbl;
ERROR: aggregate(DISTINCT ...) is not implemented yet
instead of 'parser: parse error at or near distinct'.
Bruce Momjian [Fri, 10 Dec 1999 03:59:30 +0000 (03:59 +0000)]
This should fix the \e (\p, \g, ...) behaviour on an empty query buffer.
Also, minor tweakage of tab completion, and I hope the output is flushed
on time now.
Tom Lane [Fri, 10 Dec 1999 03:01:05 +0000 (03:01 +0000)]
Correct coredump in ALTER TABLE foo ADD(). Accept explicit NULL in
typecasts, eg 'NULL::text'. Later parts of the parser don't like this
yet, but I'll work on that next.
Tom Lane [Thu, 9 Dec 1999 05:58:56 +0000 (05:58 +0000)]
Replace generic 'Illegal use of aggregates' error message with one that
shows the specific ungrouped variable being complained of. Perhaps this
will reduce user confusion...
Bruce Momjian [Thu, 9 Dec 1999 05:02:24 +0000 (05:02 +0000)]
Hi,
I was able to crash postgres 6.5.3 when I did an 'alter user' command.
After I started a debugger I found the problem in the timezone handling
of
datetime (my Linux box lost its timezone information, that's how the
problem occurred).
Only 7 bytes are reserved for the timezone, without checking for
boundaries.
Attached is a patch that fixes this problem and emits a NOTICE if a
timezone is encountered that is longer than MAXTZLEN bytes, like this:
Bruce Momjian [Tue, 7 Dec 1999 22:41:44 +0000 (22:41 +0000)]
Okay, that should put us back in sync. These two patches (src & doc) are
against the sources from one hour ago and contain all the portable and
up
to date stuff.
A few other CVS "householding" things you might want to take care of:
* Remove the src/bin/cleardbdir directory
* Remove the file src/bin/psql/sql_help.h from the repository, as it is
a derived file and is build by the release_prep.
Tom Lane [Tue, 7 Dec 1999 04:09:39 +0000 (04:09 +0000)]
Clean up memory leakage in find_inheritors() by using pg_list lists
(which are palloc'd) instead of DLLists (which are malloc'd). Not very
significant, since this routine seldom has anything useful to do, but
a leak is a leak...
Bruce Momjian [Sun, 5 Dec 1999 20:02:49 +0000 (20:02 +0000)]
I cleaned those out as well (the echo -n "bug" was in there ;) and moved
them into the scripts dir. I also added a --list option to show already
installed languages.
This whole moving and renaming totally confused CVS and my checked out
copy got completely fried last night. When you apply the source patch,
please make sure that all the directories src/bin/{create|destroy}* as
well as vacuumdb, cleardbdir are gone and that all the scripts (7) are
in
scripts/.
Meanwhile I am still puzzled about what happened with the docs patch.
Because I don't know what you got now, the second attachment contains
the
files
Tom Lane [Thu, 2 Dec 1999 00:26:15 +0000 (00:26 +0000)]
Type 'socklen_t' might be the right way to declare getsockopt()'s last
parameter in some flavor of Unix, but Linux, HPUX, and SunOS all say
it's int. For now I'm just going to make it int so that I can compile.
If the other way is actually necessary on some Unix somewhere, I guess
we will need a configure test...
Bruce Momjian [Tue, 30 Nov 1999 03:57:29 +0000 (03:57 +0000)]
create/alter user extension
This one should work much better than the one I sent in previously. The
functionality is the same, but the patch was missing one file resulting
in
the compilation failing. The docs also received a minor fix.
The first four are asynchronous analogues of PQconnectdb and PQreset -
they allow an application to connect to the DB without blocking on
remote I/O.
The PQsetenv functions perform an environment negotiation with the
server.
Internal to libpq, pqReadReady and pqWriteReady have been made available
across the library (they were previously static functions inside
fe-misc.c). A lot of internal rearrangement has been necessary to
support these changes.
The API documentation has been updated also.
Caveats:
o The Windows code does not default to using non-blocking sockets,
since I have no documentation: Define WIN32_NON_BLOCKING_CONNECTIONS to
do that.
Bruce Momjian [Mon, 29 Nov 1999 23:42:03 +0000 (23:42 +0000)]
Small patch which fixes the ODBC driver so it doesn't segfault if:
You have CommLog and Debug enabled
You encounter in error in any operation (SQLConnect/SQLExec).
Previously, the extra logging didn't check for NULL pointers
when trying to print some of the strings- the socket error
message could frequently be NULL by design (if there was no socket
error)
and Solaris does not handle NULLS passed to things like printf
("%s\n",string);
gracefully.
This basically duplicates the functionality found in Linux where passing
a null pointer
to printf prints "(NULL)". No very elegant, but the logging is for debug
only anyway.
Tom Lane [Mon, 29 Nov 1999 04:43:15 +0000 (04:43 +0000)]
Add permissions check: now one must be the Postgres superuser or the
table owner in order to vacuum a table. This is mainly to prevent
denial-of-service attacks via repeated vacuums. Allow VACUUM to gather
statistics about system relations, except for pg_statistic itself ---
not clear that it's worth the trouble to make that case work cleanly.
Cope with possible tuple size overflow in pg_statistic tuples; I'm
surprised we never realized that could happen. Hold a couple of locks
a little longer to try to prevent deadlocks between concurrent VACUUMs.
There still seem to be some problems in that last area though :-(
Tom Lane [Sun, 28 Nov 1999 22:02:17 +0000 (22:02 +0000)]
Fix "Unable to identify an operator =$" problem that occurred when pgsql
expressions were written without spaces between operators and operands.
Problem was that something like "if new.f1=new.f2 then" would be translated
to "if $1=$2 then", and the Postgres lexer would tokenize that the wrong
way. Fix is to emit spaces around $paramno constructs to ensure they are
seen as separate tokens.
Tom Lane [Sun, 28 Nov 1999 02:10:01 +0000 (02:10 +0000)]
Remove pg_vlock locking from VACUUM, allowing multiple VACUUMs to run in
parallel --- and, not incidentally, removing a common reason for needing
manual cleanup by the DB admin after a crash. Remove initial global
delete of pg_statistics rows in VACUUM ANALYZE; this was not only bad
for performance of other backends that had to run without stats for a
while, but it was fundamentally broken because it was done outside any
transaction. Surprising we didn't see more consequences of that.
Detect attempt to run VACUUM inside a transaction block. Check for
query cancel request before starting vacuum of each table. Clean up
vacuum's private portal storage if vacuum is aborted.
Tom Lane [Sun, 28 Nov 1999 02:03:04 +0000 (02:03 +0000)]
Delete pg_statistics rows for a relation during heap_destroy_with_catalog.
By dropping stats rows here, we eliminate the need for VACUUM to do a
wholesale remove of stats rows. Before, pg_statistics was wiped clean
at the start of VACUUM, ensuring poor planning results for any backends
running in parallel until VACUUM got around to rebuilding the stats for
the relations they are accessing.