to reset session userid to the originally-authenticated name.  Also,
relax SET SESSION AUTHORIZATION to allow specifying one's own username
even if one is not superuser, so as to avoid unnecessary error messages
when loading a pg_dump file that uses this command.  Per discussion from
several months ago.

some of his own privileges.

in hopes of making erroneous usage more apparent.  Per discussion 15-Apr.

where the tuple's xmin or xmax is older than the snapshot xmin.  There
is no need to check it against snapshot xmax in that case.

As proof of concept, provide an alternate implementation based on POSIX
semaphores.  Also push the SysV shared-memory implementation into a
separate file so that it can be replaced conveniently.

only if they would not be found without qualification given the current
search path, as per idea from Peter Eisentraut.

from Liam Stewart.  Minor code cleanups also.

handled as special productions.  This is needed to keep us honest about
user-schema type names that happen to coincide with system type names.
Per pghackers discussion 24-Apr.  To avoid bloating the keyword list
too much, I removed the translations for datetime, timespan, and lztext,
all of which were slated for destruction several versions back anyway.

in gram.y can make use of the keywords.c string table, instead of having
their own copies of the keyword strings.  This saves a few kilobytes and
more importantly eliminates an opportunity for cut-and-paste errors.

in the search path.  (We might want to make these available as SQL
functions too, but I haven't done that yet.)  Fix format_type to be
schema-aware.

binary case) already has.  Needed for upcoming ruleutils change.

in parse error messages, not just the part scanned by the last flex rule.
For example,
	select "foo" "bar";
used to draw
	ERROR:  parser: parse error at or near """
which was rather unhelpful.  Now it gives
	ERROR:  parser: parse error at or near ""bar""
Also, error messages concerning bitstring literals and suchlike will
quote the source text at you, not the processed internal form of the literal.

PL/PgSQL grammar, which were causing warnings when used with Bison
1.35.

Neil Conway <neilconway@rogers.com>

see changes made by the transaction itself.

in presence of schemas.

I concluded that RENAME should require CREATE privilege on the namespace
as well as ownership of the table.

don't scribble on tuple returned by table scan.

gcc does not complain about this mistake, but other compilers do.

was incorrectly used for both qsort and bsearch.

lists to join RTEs, attach a list of Vars and COALESCE expressions that will
replace the join's alias variables during planning.  This simplifies
flatten_join_alias_vars while still making it easy to fix up varno references
when transforming the query tree.  Add regression test cases for interactions
of subqueries with outer joins.