protocol 3, then falls back to 2 if postmaster rejects the startup packet
with an old-format error message.  A side benefit of the rewrite is that
SSL-encrypted connections can now be made without blocking.  (I think,
anyway, but do not have a good way to test.)

> 	o Have COPY return number of rows loaded/unloaded

catalog lookups when not in a transaction.  This prevents bizarre
failures if someone tries to set a value for session_authorization in
postgresql.conf.  Per report from Fernando Nasser.

> * Add checks for fclose() failure

extensions to support our historical behavior.  An aggregate belongs
to the closest query level of any of the variables in its argument,
or the current query level if there are no variables (e.g., COUNT(*)).
The implementation involves adding an agglevelsup field to Aggref,
and treating outer aggregates like outer variables at planning time.

Per recent gripe.

#define PG_ENCODING_BE_LAST PG_ISO_8859_8
#define PG_ENCODING_FE_LAST PG_WIN1256

but the last client encoding in the enum list is actually PG_GB18030 and
it seems that

#define PG_ENCODING_IS_CLIEN_ONLY(_enc) \
                (((_enc) > PG_ENCODING_BE_LAST && (_enc) <= PG_ENCODING_FE_LAST)

can never be true.

I think the define should read
#define PG_ENCODING_FE_LAST PG_GB18030

On the other hand, perhaps no-one cares, because
PG_ENCODING_IS_CLIEN_ONLY is never used.

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk

> * Allow logging of only data definition(DDL), or DDL and modification statements

> * Allow a single index to index multiple tables (for inheritance and subtables)
408a410
> * Improve the planner to use CHECK constraints to prune the plan (for subtables)
418a421
> * Allow partitioning of table into multiple subtables
419a423
> T

> * Allow SET CONSTRAINTS to be qualified by schema/table

> * Add config variable to prevent auto-adding missing FROM-clause tables

per report from Joe Conway.

> * Prevent whole-row references from leaking memory, e.g. SELECT COUNT(tab.*)

> * Consider using MVCC to cache count(*) queries with no WHERE clause

in its output.  Make it work with server versions back to 7.0, too.

when the plan is ReScanned, we don't have to rebuild the hash table
if there is no parameter change for its child node.  This idea has
been used for a long time in Sort and Material nodes, but was not in
the hash code till now.

yy_fatal_error() call results in elog(ERROR) not exit().  This was
already fixed in the main lexer and plpgsql, but extend same technique
to all the other dot-l files.  Also, on review of the possible calls
to yy_fatal_error(), it seems safe to use elog(ERROR) not elog(FATAL).