Avoid hard-coding lockmode used for many altering DDL commands, allowing easier
future changes of lock levels. Implementation of initial analysis on DDL
sub-commands, so that many lock levels are now at ShareUpdateExclusiveLock or
ShareRowExclusiveLock, allowing certain DDL not to block reads/writes.
First of number of planned changes in this area; additional docs required
when full project complete.

a pass-by-reference datatype with a nontrivial projection step.
We were using the same memory context for the projection operation as for
the temporary context used by the hashtable routines in execGrouping.c.
However, the hashtable routines feel free to reset their temp context at
any time, which'd lead to destroying input data that was still needed.
Report and diagnosis by Tao Ma.

Back-patch to 8.1, where the problem was introduced by the changes that
allowed us to work with "virtual" tuples instead of materializing intermediate
tuple values everywhere.  The earlier code looks quite similar, but it doesn't
suffer the problem because the data gets copied into another context as a
result of having to materialize ExecProject's output tuple.

These two settings ought to be independent of each other.

Review by Dave Page.

Backpatch to 8.4.

Marc Cousin.  Review by Kevin Grittner.

We used to be consistent about this, but my recent patch to add a
restart_after_crash GUC failed to follow the existing convention.

Report and patch from Fujii Masao.

Author: Alex Hunsaker

backpatched to 8.1

from John Gage

Reviewed by Bernd Helmle.

from John Gage

migrations.

Backpatch to 9.0.

where the oid is not preserved by pg_upgrade (everything but pg_type).
Update documentation.

Per bug report from depstein@alliedtesting.com.

by Thom Brown

- Prohibit altering column type
- Prohibit changing inheritance
- Move checks from Exec to Prep phases in ALTER TABLE code

backpatched to 9.0

We now use the phrase 'via local socket in' rather than 'on host' in both
\c and \conninfo output, when applicable.

Fujii Masao, with some kibitzing by me.

Backpatch to 8.0.

Andres Freund, with cleanup and adjustment for older branches by me.

Fujii Masao

I've added a quote_all_identifiers GUC which affects the behavior
of the backend, and a --quote-all-identifiers argument to pg_dump
and pg_dumpall which sets the GUC and also affects the quoting done
internally by those applications.

Design by Tom Lane; review by Alex Hunsaker; in response to bug #5488
filed by Hartmut Goebel.

Remove bespoke code in DoCopy and RI_Initial_Check, which now instead
fabricate call ExecCheckRTPerms with a manufactured RangeTblEntry.
This is intended to make it feasible for an enhanced security provider
to actually make use of ExecutorCheckPerms_hook, but also has the
advantage that RI_Initial_Check can allow use of the fast-path when
column-level but not table-level permissions are present.

KaiGai Kohei.  Reviewed (in an earlier version) by Stephen Frost, and by me.
Some further changes to the comments by me.

Does modification just of CVS tag text cause an empty CVS diff for the commit?

directory/symlink before creation.

Report from Tom Lane.

Backpatch to 9.0.

Per discussion with David Christensen, there can be multiple
instances of PG accessible via local sockets, and you need the port
to see which one you're actually connected to.  David's original
patch worked this way, but I inadvertently ripped it out during
commit.

David Christensen. Reviewed by Steve Singer.  Some further changes by me.

Per buildfarm, again.

Per buildfarm.

Normally, we automatically restart after a backend crash, but in some
cases when PostgreSQL is invoked by clusterware it may be desirable to
suppress this behavior, so we provide an option which does this.
Since no existing GUC group quite fits, create a new group called
"error handling options" for this and the previously undocumented GUC
exit_on_error, which is now documented.

Review by Fujii Masao.

This change should be publicized to driver maintainers at once and
release-noted as an incompatibility with previous releases.

per report from Dave Page

path when CSV logging is configured but not yet operational.  It's sufficient
to send the message to stderr, as we were already doing, and the "Not safe"
gripe has already confused at least two core members ...

Backpatch to 9.0, but not further --- doesn't seem appropriate to change
this behavior in stable branches.

any implicit casting previously applied to the targetlist item.  This is
reasonable because the implicit cast, by definition, wasn't written by the
user; so we are preserving the expected behavior that ORDER BY items match
textually equivalent tlist items.  The case never arose before because there
couldn't be any implicit casting of a top-level SELECT item before we process
ORDER BY etc.  But now it can arise in the context of aggregates containing
ORDER BY clauses, since the "targetlist" is the already-casted list of
arguments for the aggregate.  The net effect is that the datatype used for
ORDER BY/DISTINCT purposes is the aggregate's declared input type, not that
of the original input column; which is a bit debatable but not horrendous,
and to do otherwise would require major rework that doesn't seem justified.

Per bug #5564 from Daniel Grace.  Back-patch to 9.0 where aggregate ORDER BY
was implemented.

This adds a libpq connection parameter requirepeer that specifies the user
name that the server process is expected to run under.

reviewed by KaiGai Kohei