rdelaage
/
postgresql
mirror of https://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
42,384 Commits 36 Branches 606 Tags 423 MiB
C 86%
PLpgSQL 5.5%
Perl 4.1%
Yacc 1.3%
Makefile 0.7%
Other 2.3%
Go to file
Tom Lane 3f902354b0 Clean up after insufficiently-researched optimization of tuple conversions. 
tupconvert.c's functions formerly considered that an explicit tuple
conversion was necessary if the input and output tupdescs contained
different type OIDs.  The point of that was to make sure that a composite
datum resulting from the conversion would contain the destination rowtype
OID in its composite-datum header.  However, commit 3838074f8 entirely
misunderstood what that check was for, thinking that it had something to do
with presence or absence of an OID column within the tuple.  Removal of the
check broke the no-op conversion path in ExecEvalConvertRowtype, as
reported by Ashutosh Bapat.

It turns out that of the dozen or so call sites for tupconvert.c functions,
ExecEvalConvertRowtype is the only one that cares about the composite-datum
header fields in the output tuple.  In all the rest, we'd much rather avoid
an unnecessary conversion whenever the tuples are physically compatible.
Moreover, the comments in tupconvert.c only promise physical compatibility
not a metadata match.  So, let's accept the removal of the guarantee about
the output tuple's rowtype marking, recognizing that this is a API change
that could conceivably break third-party callers of tupconvert.c.  (So,
let's remember to mention it in the v10 release notes.)

However, commit 3838074f8 did have a bit of a point here, in that two
tuples mustn't be considered physically compatible if one has HEAP_HASOID
set and the other doesn't.  (Some of the callers of tupconvert.c might not
really care about that, but we can't assume it in general.)  The previous
check accidentally covered that issue, because no RECORD types ever have
OIDs, while if two tupdescs have the same named composite type OID then,
a fortiori, they have the same tdhasoid setting.  If we're removing the
type OID match check then we'd better include tdhasoid match as part of
the physical compatibility check.

Without that hack in tupconvert.c, we need ExecEvalConvertRowtype to take
responsibility for inserting the correct rowtype OID label whenever
tupconvert.c decides it need not do anything.  This is easily done with
heap_copy_tuple_as_datum, which will be considerably faster than a tuple
disassembly and reassembly anyway; so from a performance standpoint this
change is a win all around compared to what happened in earlier branches.
It just means a couple more lines of code in ExecEvalConvertRowtype.

Ashutosh Bapat and Tom Lane

Discussion: https://postgr.es/m/CAFjFpRfvHABV6+oVvGcshF8rHn+1LfRUhj7Jz1CDZ4gPUwehBg@mail.gmail.com
 		2017-04-06 21:10:20 -04:00
config Fix configure check for typeof 2017-03-28 22:28:56 -04:00
contrib Reset API of clause_selectivity() 2017-04-06 19:10:51 -04:00
doc Fix logical replication between different encodings 2017-04-06 14:41:09 -04:00
src Clean up after insufficiently-researched optimization of tuple conversions. 2017-04-06 21:10:20 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Allow .so minor version numbers above 9 in .gitignore. 2016-08-15 17:35:35 -04:00
COPYRIGHT Update copyright for 2017 2017-01-03 12:37:53 -05:00
GNUmakefile.in Have "make coverage" recurse into contrib as well 2016-09-05 18:44:36 -03:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
aclocal.m4 ICU support 2017-03-23 15:28:48 -04:00
configure Allow --with-wal-segsize=n up to n=1024MB 2017-04-05 15:38:17 -04:00
configure.in Allow --with-wal-segsize=n up to n=1024MB 2017-04-05 15:38:17 -04:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.