utility statement (DeclareCursorStmt) with a SELECT query dangling from
it, rather than a SELECT query with a few unusual fields in it. Add
code to determine whether a planned query can safely be run backwards.
If DECLARE CURSOR specifies SCROLL, ensure that the plan can be run
backwards by adding a Materialize plan node if it can't. Without SCROLL,
you get an error if you try to fetch backwards from a cursor that can't
handle it. (There is still some discussion about what the exact
behavior should be, but this is necessary infrastructure in any case.)
Along the way, make EXPLAIN DECLARE CURSOR work.
entire contents of the subplan into the tuplestore before we can return
any tuples. Instead, the tuplestore holds what we've already read, and
we fetch additional rows from the subplan as needed. Random access to
the previously-read rows works with the tuplestore, and doesn't affect
the state of the partially-read subplan. This is a step towards fixing
the problems with cursors over complex queries --- we don't want to
stick in Materialize nodes if they'll prevent quick startup for a cursor.
Applied patch from Rich Cullingford to fix a NPE in the absolute() method of result set.
Applied patch from Tarjei Skorgenes to fix a NPE when logging is enabled.
Modified Files:
jdbc/org/postgresql/core/BaseResultSet.java
jdbc/org/postgresql/jdbc1/AbstractJdbc1ResultSet.java
jdbc/org/postgresql/jdbc2/Array.java
jdbc/org/postgresql/util/PSQLException.java
> * Allow savepoints / nested transactions [transactions] (Bruce)
215d210
< o Add GUC parameter to control the maximum number of rewrite cycles
227,228c222
< o Allow parameters to be specified by name and type during
< definition
> o Allow parameters to be specified by name and type during definition
304,305d297
< * Overhaul bufmgr/lockmgr/transaction manager
< * Allow savepoints / nested transactions [transactions] (Bruce)
386,387c378,379
< * Add checkpoint_min_warning postgresql.conf option to warn about checkpoints
< that are too frequent
> * -Add checkpoint_min_warning postgresql.conf option to warn about checkpoints
> that are too frequent (Bruce)
390d381
< * Allow pg_xlog to be moved without symlinks
406c397
< * Precompile SQL functions to avoid overhead (Neil)
> * -Precompile SQL functions to avoid overhead (Neil)
cleaning out temp namespaces. We don't really want the server log to be
cluttered with 'Drop cascades to table foo' every time someone uses a
temp table...
problems in applications that may have a large number of files open,
such that libpq's socket number exceeds the range supported by fd_set.
From Chris Brown.
at database shutdown, and then load it again at database startup. This
preserves our hard-won knowledge of free space across restarts (given
an orderly shutdown, that is).
DELETE of an inheritance tree references another inherited relation.
This bug has been latent since 7.1; I'm still not quite sure why 7.1 and
7.2 don't manifest it (at least, they don't crash on a simple test case).
Adjustable threshold is gone in favor of keeping track of total requested
page storage and doling out proportional fractions to each relation
(with a minimum amount per relation, and some quantization of the results
to avoid thrashing with small changes in page counts). Provide special-
case code for indexes so as not to waste space storing useless page
free space counts. Restructure internal data storage to be a flat array
instead of list-of-chunks; this may cost a little more work in data
copying when reorganizing, but allows binary search to be used during
lookup_fsm_page_entry().
the join, per recent discussion on pgsql-sql. Not clear that this will
come up often in real queries, but it's not any more expensive to do it
right, so we may as well do it right.
is assumed to be in local time, not GMT. This improves consistency with
other operations, which all assume local timezone when it matters. Per
bug #897.
recursion in RewriteQuery(); also, detect recursion in fireRIRrules(),
so as to catch self-referential views per example from Ryan VanderBijl.
Minor code restructuring to make it easier to catch recursive case.
end of a btree index. This isn't super-effective, since we won't move
nondeletable pages, but it's better than nothing. Also, improve stats
displayed during VACUUM VERBOSE.
deleting multiple index entries on a single index page. This makes for
a very substantial reduction in the amount of WAL traffic during a
large delete operation.
service it until after we execute SetThisStartUpID(). Else shutdown
process will write the wrong SUI into the shutdown checkpoint, which
seems likely to be trouble --- although I've not quite figured out
how significant it really is.
setting timezone-related variables during transaction start. They were
not used anyway in platforms that HAVE_TM_ZONE or HAVE_INT_TIMEZONE,
which it appears is *all* the platforms we are currently supporting.
For platforms that have neither, we now only support UTC or numeric-
offset-from-UTC timezones.
now knows what to do upon hitting a dead page (in theory anyway, it's
untested...). Add a post-VACUUM-cleanup entry point for index AMs, to
provide a place for dead-page scavenging to happen.
Also, fix oversight that broke btpo_prev links in temporary indexes.
initdb forced due to additions in pg_am.
support btree compaction, as per proposal of a few days ago. btree index
pages no longer store parent links, instead they have a level indicator
(counting up from zero for leaf pages). The FixBTree recovery logic is
removed, and replaced by code that detects missing parent-level insertions
during WAL replay. Also, generate appropriate WAL entries when updating
btree metapage and when building a btree index from scratch. I believe
btree indexes are now completely WAL-legal for the first time.
initdb forced due to index and WAL changes.
Bruce Momjian
Tom Lane
Barry Lind
D'Arcy J.M. Cain
Michael Meskes