Tom Lane [Tue, 7 Apr 2009 15:53:54 +0000 (15:53 +0000)]
Defend against non-ASCII letters in fuzzystrmatch code. The functions
still don't behave very sanely for multibyte encodings, but at least
they won't be indexing off the ends of static arrays.
Tom Lane [Tue, 7 Apr 2009 00:31:26 +0000 (00:31 +0000)]
Add an optional parameter to pg_start_backup() that specifies whether to do
the checkpoint in immediate or lazy mode. This is to address complaints
that pg_start_backup() takes a long time even when there's no need to minimize
its I/O consumption.
Tom Lane [Sun, 5 Apr 2009 22:28:59 +0000 (22:28 +0000)]
Change cardinality() into a C-code function, instead of a SQL-language
alias for array_length(v,1). The efficiency gain here is doubtless
negligible --- what I'm interested in is making sure that if we have
second thoughts about the definition, we will not have to force a
post-beta initdb to change the implementation.
Tom Lane [Sun, 5 Apr 2009 20:32:06 +0000 (20:32 +0000)]
Make ExecInitExpr build the list of SubPlans found in a plan tree in order
of discovery, rather than reverse order. This doesn't matter functionally
(I suppose the previous coding dates from the time when lcons was markedly
cheaper than lappend). However now that EXPLAIN is labeling subplans with
IDs that are based on order of creation, this may help produce a slightly
less surprising printout.
Tom Lane [Sun, 5 Apr 2009 19:59:40 +0000 (19:59 +0000)]
Change EXPLAIN output so that subplans and initplans (particularly CTEs)
are individually labeled, rather than just grouped under an "InitPlan"
or "SubPlan" heading. This in turn makes it possible for decompilation of
a subplan reference to usefully identify which subplan it's referencing.
I also made InitPlans identify which parameter symbol(s) they compute,
so that references to those parameters elsewhere in the plan tree can
be connected to the initplan that will be executed. Per a gripe from
Robert Haas about EXPLAIN output of a WITH query being inadequate,
plus some longstanding pet peeves of my own.
Fix infinite loop while checking of partial match in pending list.
Improve comments. Now GIN-indexable operators should be strict.
Per Tom's questions/suggestions.
Tom Lane [Sun, 5 Apr 2009 04:19:59 +0000 (04:19 +0000)]
Remove a boatload of useless definitions of 'int optreset'. If we
are using our own ports of getopt or getopt_long, those will define
the variable for themselves; and if not, we don't need these, because
we never touch the variable anyway.
Tom Lane [Sun, 5 Apr 2009 04:09:01 +0000 (04:09 +0000)]
I had always wondered why pg_config.h.win32 claimed that Windows
provides optreset. Current mastodon results prove that in fact it
does not; it was only because getopt.c defined the variable anyway
that things failed to fall over.
Tom Lane [Sun, 5 Apr 2009 00:40:35 +0000 (00:40 +0000)]
Remove contrib/intarray's definitions of the <@ and @> operators, so that they
don't cause confusion with the built-in anyarray versions of those operators.
Adjust the module's index opclasses to support the built-in operators in place
of the private ones.
The private implementations are still available under their historical
names @ and ~, so no functionality is lost. Some quick testing suggests
that they offer no real benefit over the core operators, however.
Tom Lane [Sat, 4 Apr 2009 21:55:50 +0000 (21:55 +0000)]
Make an attempt at fixing our current Solaris 11 breakage: add a configure
probe for opterr (exactly like the one for optreset) and have getopt.c
define the variables only if configure doesn't find them in libc.
Tom Lane [Sat, 4 Apr 2009 21:12:31 +0000 (21:12 +0000)]
Remove the recently added node types ReloptElem and OptionDefElem in favor
of adding optional namespace and action fields to DefElem. Having three
node types that do essentially the same thing bloats the code and leads
to errors of confusion, such as in yesterday's bug report from Khee Chin.
Tom Lane [Sat, 4 Apr 2009 17:40:36 +0000 (17:40 +0000)]
A session that does not have any live snapshots does not have to be waited for
when we are waiting for old snapshots to go away during a concurrent index
build. In particular, this rule lets us avoid waiting for
idle-in-transaction sessions.
This logic could be improved further if we had some way to wake up when
the session we are currently waiting for goes idle-in-transaction. However
that would be a significantly more complex/invasive patch, so it'll have to
wait for some other day.
Tom Lane [Sat, 4 Apr 2009 04:53:25 +0000 (04:53 +0000)]
Rewrite interval_hash() so that the hashcodes are equal for values that
interval_eq() considers equal. I'm not sure how that fundamental requirement
escaped us through multiple revisions of this hash function, but there it is;
it's been wrong since interval_hash was first written for PG 7.1.
Per bug #4748 from Roman Kononov.
Backpatch to all supported releases.
This patch changes the contents of hash indexes for interval columns. That's
no particular problem for PG 8.4, since we've broken on-disk compatibility
of hash indexes already; but it will require a migration warning note in
the next minor releases of all existing branches: "if you have any hash
indexes on columns of type interval, REINDEX them after updating".
To implement this without almost duplicating the reloption table, treat
relopt_kind as a bitmask instead of an integer value. This decreases the
range of allowed values, but it's not clear that there's need for that much
values anyway.
This patch also makes heap_reloptions explicitly a no-op for relation kinds
other than heap and TOAST tables.
Patch by ITAGAKI Takahiro with minor edits from me. (In particular I removed
the bit about adding relation kind to an error message, which I intend to
commit separately.)
Tom Lane [Sat, 4 Apr 2009 00:41:11 +0000 (00:41 +0000)]
Make \dt \di and friends more consistent about the treatment of
TOAST tables and indexes; to wit, never show either. (You can
examine them with plain \d if you're really so inclined.)
Tom Lane [Fri, 3 Apr 2009 23:27:17 +0000 (23:27 +0000)]
Use (unsigned char) cast in argument of pg_tolower(). Maybe it works on
Windows without that, but we shouldn't put bad examples where people might
copy them. Also, reformat slightly to improve the odds that pgindent
won't go nuts on this.
Tom Lane [Fri, 3 Apr 2009 18:17:43 +0000 (18:17 +0000)]
Add a comment documenting the question of whether PrefetchBuffer should
try to protect an already-existing buffer from being evicted. This was
left as an open issue when the posix_fadvise patch was committed. I'm
not sure there's any evidence to justify more work in this area, but we
should have some record about it in the source code.
Tom Lane [Fri, 3 Apr 2009 16:59:43 +0000 (16:59 +0000)]
Defend against possible crash if a plpython function does not specify names
for its arguments. Also add a regression test, since someone apparently
changed every single plpython test case to use only named parameters; else
we'd have noticed this sooner.
Euler Taveira de Oliveira, per a report from Alvaro
Magnus Hagander [Fri, 3 Apr 2009 11:52:08 +0000 (11:52 +0000)]
Make directory name comparisons on Win32 case insensitive.
This method will not catch all different ways since the locale
handling in NTFS doesn't provide an easy way to do that, but it
will hopefully solve the most common cases causing startup
problems when the backend is found in the system PATH.
Tom Lane [Thu, 2 Apr 2009 22:39:30 +0000 (22:39 +0000)]
Refactor ExecProject and associated routines so that fast-path code is used
for simple Var targetlist entries all the time, even when there are other
entries that are not simple Vars. Also, ensure that we prefetch attributes
(with slot_getsomeattrs) for all Vars in the targetlist, even those buried
within expressions. In combination these changes seem to significantly
reduce the runtime for cases where tlists are mostly but not exclusively
Vars. Per my proposal of yesterday.
Tom Lane [Thu, 2 Apr 2009 17:30:53 +0000 (17:30 +0000)]
Fix SetClientEncoding() to maintain a cache of previously selected encoding
conversion functions. This allows transaction rollback to revert to a
previous client_encoding setting without doing fresh catalog lookups.
I believe that this explains and fixes the recent report of "failed to commit
client_encoding" failures.
This bug is present in 8.3.x, but it doesn't seem prudent to back-patch
the fix, at least not till it's had some time for field testing in HEAD.
In passing, remove SetDefaultClientEncoding(), which was used nowhere.
Tom Lane [Thu, 2 Apr 2009 03:51:43 +0000 (03:51 +0000)]
Fix GUC's reports of assign_hook failure to always include the parameter value
we failed to assign, even in "can't happen" cases. Motivated by wondering
what's going on in a recent trouble report where "failed to commit" did
happen.
Tom Lane [Thu, 2 Apr 2009 01:16:11 +0000 (01:16 +0000)]
plpgsql's exec_simple_cast_value() mistakenly supposed that it could bypass
casting effort whenever the input value was NULL. However this prevents
application of not-null domain constraints in the cases that use this
function, as illustrated in bug #4741. Since this function isn't meant
for use in performance-critical paths anyway, this certainly seems like
another case of "premature optimization is the root of all evil".
Back-patch as far as 8.2; older versions made no effort to enforce
domain constraints here anyway.
Tom Lane [Tue, 31 Mar 2009 22:54:31 +0000 (22:54 +0000)]
Fix contrib/pgstattuple and contrib/pageinspect to prevent attempts to read
temporary tables of other sessions; that is unsafe because of the way our
buffer management works. Per report from Stuart Bishop.
This is redundant with the bufmgr.c checks in HEAD, but not at all redundant
in the back branches.
Tom Lane [Tue, 31 Mar 2009 22:12:48 +0000 (22:12 +0000)]
Modify the relcache to record the temp status of both local and nonlocal
temp relations; this is no more expensive than before, now that we have
pg_class.relistemp. Insert tests into bufmgr.c to prevent attempting
to fetch pages from nonlocal temp relations. This provides a low-level
defense against bugs-of-omission allowing temp pages to be loaded into shared
buffers, as in the contrib/pgstattuple problem reported by Stuart Bishop.
While at it, tweak a bunch of places to use new relcache tests (instead of
expensive probes into pg_namespace) to detect local or nonlocal temp tables.
Tom Lane [Tue, 31 Mar 2009 17:59:56 +0000 (17:59 +0000)]
Add a "relistemp" boolean column to pg_class, which is true for temporary
relations (including a temp table's indexes and toast table/index), and
false for normal relations. For ease of checking, this commit just adds
the column and fills it correctly --- revising the relation access machinery
to use it will come separately.
Fix a rare race condition when commit_siblings > 0 and a transaction commits
at the same instant as a new backend is spawned. Since CountActiveBackends()
doesn't hold ProcArrayLock, it needs to be prepared for the case that a
pointer at the end of the proc array is still NULL even though numProcs says
it should be valid, since it doesn't hold ProcArrayLock. Backpatch to 8.1.
8.0 and earlier had this right, but it was broken in the split of PGPROC and
sinval shared memory arrays.
Tom Lane [Mon, 30 Mar 2009 17:30:44 +0000 (17:30 +0000)]
Fix window function plan generation to cope with volatile sort expressions.
(Not clear how useful these really are, but failing is no good...)
Per report from David Fetter and Robert Treat.
Tom Lane [Mon, 30 Mar 2009 04:08:43 +0000 (04:08 +0000)]
Fix an oversight in the support for storing/retrieving "minimal tuples" in
TupleTableSlots. We have functions for retrieving a minimal tuple from a slot
after storing a regular tuple in it, or vice versa; but these were implemented
by converting the internal storage from one format to the other. The problem
with that is it invalidates any pass-by-reference Datums that were already
fetched from the slot, since they'll be pointing into the just-freed version
of the tuple. The known problem cases involve fetching both a whole-row
variable and a pass-by-reference value from a slot that is fed from a
tuplestore or tuplesort object. The added regression tests illustrate some
simple cases, but there may be other failure scenarios traceable to the same
bug. Note that the added tests probably only fail on unpatched code if it's
built with --enable-cassert; otherwise the bug leads to fetching from freed
memory, which will not have been overwritten without additional conditions.
Fix by allowing a slot to contain both formats simultaneously; which turns out
not to complicate the logic much at all, if anything it seems less contorted
than before.
Back-patch to 8.2, where minimal tuples were introduced.
Tom Lane [Fri, 27 Mar 2009 19:58:11 +0000 (19:58 +0000)]
On Solaris, we should only force use of our own getopt(); it's okay to use
the system's getopt_long(). The previous coding was the result of a sloppy
discussion that failed to draw this distinction. The result was that PG
programs don't handle options as users of that platform expect. Per
gripe from Chuck McDevitt.
Although this is a pre-existing bug, I'm not backpatching since I think we
could do with a bit of beta testing before concluding this is really OK.
Tom Lane [Fri, 27 Mar 2009 18:30:21 +0000 (18:30 +0000)]
Fix possible failures when a tuplestore switches from in-memory to on-disk
mode while callers hold pointers to in-memory tuples. I reported this for
the case of nodeWindowAgg's primary scan tuple, but inspection of the code
shows that all of the calls in nodeWindowAgg and nodeCtescan are at risk.
For the moment, fix it with a rather brute-force approach of copying
whenever one of the at-risk callers requests a tuple. Later we might
think of some sort of reference-count approach to reduce tuple copying.