Migration to version 7.4.9
A dump/restore is not required for those running 7.4.X. However, if you
are upgrading from a version earlier than 7.4.8, see the release notes
for 7.4.8.
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Changes
* Fix error that allowed "VACUUM" to remove ctid chains too soon, and
add more checking in code that follows ctid links
This fixes a long-standing problem that could cause crashes in very
rare circumstances.
* Fix CHAR() to properly pad spaces to the specified length when
using a multiple-byte character set (Yoshiyuki Asaba)
In prior releases, the padding of CHAR() was incorrect because it
only padded to the specified number of bytes without considering
how many characters were stored.
* Fix the sense of the test for read-only transaction in "COPY"
The code formerly prohibited "COPY TO", where it should prohibit
"COPY FROM".
* Fix planning problem with outer-join ON clauses that reference only
the inner-side relation
* Further fixes for x FULL JOIN y ON true corner cases
* Make array_in and array_recv more paranoid about validating their
OID parameter
* Fix missing rows in queries like UPDATE a=... WHERE a... with GiST
index on column a
* Improve robustness of datetime parsing
* Improve checking for partially-written WAL pages
* Improve robustness of signal handling when SSL is enabled
* Don't try to open more than max_files_per_process files during
postmaster startup
* Various memory leakage fixes
* Various portability improvements
* Fix PL/PgSQL to handle var := var correctly when the variable is of
pass-by-reference type
* Update "contrib/tsearch2" to use current Snowball code
4e88bfe962