Release 8.2.7

PostgreSQL 9.1.2 Documentation
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# E.56. Release 8.2.7

> Release Date: 2008-03-17

This release contains a variety of fixes from 8.2.6. For information about new features in the 8.2 major release, see Section E.63.

## E.56.1. Migration to Version 8.2.7

A dump/restore is not required for those running 8.2.X. However, you might need to `REINDEX` indexes on textual columns after updating, if you are affected by the Windows locale issue described below.

## E.56.2. Changes

- Fix character string comparison for Windows locales that consider different character combinations as equal (Tom)

  This fix applies only on Windows and only when using UTF-8 database encoding. The same fix was made for all other cases over two years ago, but Windows with UTF-8 uses a separate code path that was not updated. If you are using a locale that considers some non-identical strings as equal, you may need to `REINDEX` to fix existing indexes on textual columns.

- Repair potential deadlock between concurrent `VACUUM FULL` operations on different system catalogs (Tom)

- Fix longstanding `LISTEN`/`NOTIFY` race condition (Tom)

  In rare cases a session that had just executed a `LISTEN` might not get a notification, even though one would be expected because the concurrent transaction executing `NOTIFY` was observed to commit later.

  A side effect of the fix is that a transaction that has executed a not-yet-committed `LISTEN` command will not see any row in `pg_listener` for the `LISTEN`, should it choose to look; formerly it would have. This behavior was never documented one way or the other, but it is possible that some applications depend on the old behavior.

- Disallow `LISTEN` and `UNLISTEN` within a prepared transaction (Tom)

  This was formerly allowed but trying to do it had various unpleasant consequences, notably that the originating backend could not exit as long as an `UNLISTEN` remained uncommitted.

- Disallow dropping a temporary table within a prepared transaction (Heikki)

  This was correctly disallowed by 8.1, but the check was inadvertently broken in 8.2.

- Fix rare crash when an error occurs during a query using a hash index (Heikki)

- Fix memory leaks in certain usages of set-returning functions (Neil)

- Fix input of datetime values for February 29 in years BC (Tom)

  The former coding was mistaken about which years were leap years.

- Fix "unrecognized node type" error in some variants of `ALTER OWNER` (Tom)

- Ensure `pg_stat_activity`.`waiting` flag is cleared when a lock wait is aborted (Tom)

- Fix handling of process permissions on Windows Vista (Dave, Magnus)

  In particular, this fix allows starting the server as the Administrator user.

- Update time zone data files to tzdata release 2008a (in particular, recent Chile changes); adjust timezone abbreviation `VET` (Venezuela) to mean UTC-4:30, not UTC-4:00 (Tom)

- Fix pg_ctl to correctly extract the postmaster's port number from command-line options (Itagaki Takahiro, Tom)

  Previously, `pg_ctl start -w` could try to contact the postmaster on the wrong port, leading to bogus reports of startup failure.

- Use `-fwrapv` to defend against possible misoptimization in recent gcc versions (Tom)

  This is known to be necessary when building PostgreSQL with gcc 4.3 or later.

- Correctly enforce `statement_timeout` values longer than `INT_MAX` microseconds (about 35 minutes) (Tom)

  This bug affects only builds with `--enable-integer-datetimes`.

- Fix "unexpected PARAM_SUBLINK ID" planner error when constant-folding simplifies a sub-select (Tom)

- Fix logical errors in constraint-exclusion handling of `IS NULL` and `NOT` expressions (Tom)

  The planner would sometimes exclude partitions that should not have been excluded because of the possibility of NULL results.

- Fix another cause of "failed to build any N-way joins" planner errors (Tom)

  This could happen in cases where a clauseless join needed to be forced before a join clause could be exploited.

- Fix incorrect constant propagation in outer-join planning (Tom)

  The planner could sometimes incorrectly conclude that a variable could be constrained to be equal to a constant, leading to wrong query results.

- Fix display of constant expressions in `ORDER BY` and `GROUP BY` (Tom)

  An explictly casted constant would be shown incorrectly. This could for example lead to corruption of a view definition during dump and reload.

- Fix libpq to handle NOTICE messages correctly during COPY OUT (Tom)

  This failure has only been observed to occur when a user-defined datatype's output routine issues a NOTICE, but there is no guarantee it couldn't happen due to other causes.

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