< * Maintain a map of recently-expired rows
<
<   This allows vacuum to target specific pages for possible free space
<   without requiring a sequential scan.
<
Update entry:

>   One complexity is that index entries still have to be vacuumed, and
>   doing this without an index scan (by using the heap values to find the
>   index entry) might be slow and unreliable, especially for user-defined
>   index functions.

context since the previous AllocSetReset.  Original patch by Atsushi Ogawa,
editorialized on a little bit by Tom Lane.

> * Eventually enable escape_string_warning and standard_conforming_strings

Gavin Sherry

fit into a 512K shared memory segment.

assert-enabled builds).  This is a temporary measure to see if we can
learn anything about those intermittent stats test failures in the
buildfarm.

per Bruce's suggestion.

Per report from Jaime Casanova.

reality.

saves nearly 700kB in the default shared memory segment size, which seems
worthwhile, and it is a feature that many users won't use anyway.  Per
Heikki's argument, there is no point in a compromise value --- those who
are using 2PC at all will probably want it at least equal to max_connections.
But we can't set it to zero by default without breaking the prepared_xacts
regression test.

it can be done right.  Allow explicit use of absolute DataDir path.
Per Dave Page.

will use pthreadGC2.

Dave Page

SYNC instruction.

got an empty bitmap after any step; the remaining subplans can no longer
affect the result.  Per a suggestion from Ilia Kantor.

> * Add function to return the thread safety status of libpq and ecpg

to cope with a group name when dumping from a pre-8.1 installation.
Per report from Stefan Kaltenbrunner.

are cases where it appears to have zero run cost.

so that the latter estimates the number of groups that grouping will
produce.  This is needed because it is primarily query_planner that
makes the decision between fast-start and fast-finish plans, and in the
original coding it was unable to make more than a crude rule-of-thumb
choice when the query involved grouping.  This revision helps us make
saner choices for queries like SELECT ... GROUP BY ... LIMIT, as in a
recent example from Mark Kirkwood.  Also move the responsibility for
canonicalizing sort_pathkeys and group_pathkeys into query_planner;
this information has to be available anyway to support the first change,
and doing it this way lets us get rid of compare_noncanonical_pathkeys
entirely.

to copy the whole plan tree before invoking adjust_plan_varnos(); else
if there is any multiply-linked substructure, the latter might increment
some Var's varno twice.  Previously there were some retail copyObject
calls inside adjust_plan_varnos, but it seems a lot safer to just dup the
whole tree first.  Also, set_inner_join_references was trying to avoid
work by not recursing if a BitmapHeapScan's bitmapqualorig contained no
outer references; which was OK at the time the code was written, I think,
but now that create_bitmap_scan_plan removes duplicate clauses from
bitmapqualorig it is possible for that field to be NULL while outer
references still remain in the qpqual and/or contained indexscan nodes.
For safety, always recurse even if the BitmapHeapScan looks to be outer
reference free.  Per reports from Michael Fuhr and Oleg Bartunov.

the reference I consulted yesterday said SC does a SYNC, but apparently
this is not true on newer MIPS processors, so be safe.

sql_information_info -> sql_implementation_info

Robert Treat

> * Allow user-defined types to specify a type modifier at table creation
>   time

>
>   Another issue is whether underlying table changes should be reflected
>   in the view, e.g. should SELECT * show additional columns if they
>   are added after the view is created.

but for sure it's not any more broken than the prior version.

> 	o Issue a warning if a change-on-restart-only postgresql.conf value
> 	  is modified  and the server config files are reloaded
> 	o Mark change-on-restart-only values in postgresql.conf
205a209
> 	o Fix SELECT '0.01 years'::interval, '0.01 months'::interval

>
> 	  Currently, while \e saves a single query as one entry, interactive
> 	  queries are saved one line at a time.  Ideally all queries
> 	  whould be saved like \e does.
>
> 	o Allow multi-line column values to align in the proper columns
>
> 	  If the second output column value is 'a\nb', the 'b' should appear
> 	  in the second display column, rather than the first column as it
> 	  does now.