On 22nd of February, Peter Eisentraut committed patch:
pg_basebackup: Add support for relocating tablespaces Tablespaces can be relocated in plain backup mode by specifying one or more -T olddir=newdir options. Author: Steeve Lennmark Reviewed-by: Peter Eisentraut
Continue reading Waiting for 9.4 – pg_basebackup: Add support for relocating tablespaces
On 29th of January, Robert Haas committed patch:
Include planning time in EXPLAIN ANALYZE output. This doesn't work for prepared queries, but it's not too easy to get the information in that case and there's some debate as to exactly what the right thing to measure is, so just do this for now. Andreas Karlsson, with slight doc changes by me.
Continue reading Waiting for 9.4 – Include planning time in EXPLAIN ANALYZE output.
On 29th of January, Andrew Dunstan committed patch:
Add json_array_elements_text function. This was a notable omission from the json functions added in 9.3 and there have been numerous complaints about its absence. Laurence Rowe.
Continue reading Waiting for 9.4 – Add json_array_elements_text function.
On 28th of January, Andrew Dunstan committed patch:
New json functions. json_build_array() and json_build_object allow for the construction of arbitrarily complex json trees. json_object() turns a one or two dimensional array, or two separate arrays, into a json_object of name/value pairs, similarly to the hstore() function. json_object_agg() aggregates its two arguments into a single json object as name value pairs. Catalog version bumped. Andrew Dunstan, reviewed by Marko Tiikkaja.
So, couple of days ago, some guy, from Periscope company wrote a blogpost about getting number of distinct elements, per group, faster using subqueries.
This was then submitted to Hacker News and r/Programming on Reddit.
Then, the original authors submitted second blogpost comparing speed between four different DB engines. Which, in turn, was also commented on Reddit.
I found the numbers presented by Periscope (as their improvement) as not that great.
Unfortunately – their blog doesn't allow for comments, so I decided to test it, and write on my own blog, what I can find about it.
Continue reading Getting count of distinct elements, per group, in PostgreSQL.
On 28th of January, Fujii Masao committed patch:
Add pg_stat_archiver statistics view. This view shows the statistics about the WAL archiver process's activity. Gabriele Bartolini, reviewed by Michael Paquier, refactored a bit by me.
Continue reading Waiting for 9.4 – Add pg_stat_archiver statistics view.
On 25th of January, Heikki Linnakangas committed patch:
Add recovery_target='immediate' option. This allows ending recovery as a consistent state has been reached. Without this, there was no easy way to e.g restore an online backup, without replaying any extra WAL after the backup ended. MauMau and me.
Continue reading Waiting for 9.4 – Add recovery_target='immediate' option.
On 18th of January, Stephen Frost committed patch:
Add ALTER TABLESPACE ... MOVE command This adds a 'MOVE' sub-command to ALTER TABLESPACE which allows moving sets of objects from one tablespace to another. This can be extremely handy and avoids a lot of error-prone scripting. ALTER TABLESPACE ... MOVE will only move objects the user owns, will notify the user if no objects were found, and can be used to move ALL objects or specific types of objects (TABLES, INDEXES, or MATERIALIZED VIEWS).
He followed it, with another commit:
Add CREATE TABLESPACE ... WITH ... Options Tablespaces have a few options which can be set on them to give PG hints as to how the tablespace behaves (perhaps it's faster for sequential scans, or better able to handle random access, etc). These options were only available through the ALTER TABLESPACE command. This adds the ability to set these options at CREATE TABLESPACE time, removing the need to do both a CREATE TABLESPACE and ALTER TABLESPACE to get the correct options set on the tablespace. Vik Fearing, reviewed by Michael Paquier.
On 23rd of December, Tom Lane committed patch:
Support ordered-set (WITHIN GROUP) aggregates. This patch introduces generic support for ordered-set and hypothetical-set aggregate functions, as well as implementations of the instances defined in SQL:2008 (percentile_cont(), percentile_disc(), rank(), dense_rank(), percent_rank(), cume_dist()). We also added mode() though it is not in the spec, as well as versions of percentile_cont() and percentile_disc() that can compute multiple percentile values in one pass over the data. Unlike the original submission, this patch puts full control of the sorting process in the hands of the aggregate's support functions. To allow the support functions to find out how they're supposed to sort, a new API function AggGetAggref() is added to nodeAgg.c. This allows retrieval of the aggregate call's Aggref node, which may have other uses beyond the immediate need. There is also support for ordered-set aggregates to install cleanup callback functions, so that they can be sure that infrastructure such as tuplesort objects gets cleaned up. In passing, make some fixes in the recently-added support for variadic aggregates, and make some editorial adjustments in the recent FILTER additions for aggregates. Also, simplify use of IsBinaryCoercible() by allowing it to succeed whenever the target type is ANY or ANYELEMENT. It was inconsistent that it dealt with other polymorphic target types but not these. Atri Sharma and Andrew Gierth; reviewed by Pavel Stehule and Vik Fearing, and rather heavily editorialized upon by Tom Lane
Continue reading Waiting for 9.4 – Support ordered-set (WITHIN GROUP) aggregates.
On 20th of December, Robert Haas committed patch:
pg_prewarm, a contrib module for prewarming relationd data. Patch by me. Review by Álvaro Herrera, Amit Kapila, Jeff Janes, Gurjeet Singh, and others.
Continue reading Waiting for 9.4 – pg_prewarm, a contrib module for prewarming relationd data.