Why is “depesz” between “de luca” and “de vil”?

Every so often someone asks why sorting behaves irrational. Like here:

$ SELECT string FROM test ORDER BY string;
  string
----------
 dean
 deer
 de luca
 depesz
 de vil
 dyslexia
(6 ROWS)

Why aren't “de luca" and “de vil" together?

Continue reading Why is “depesz" between “de luca" and “de vil"?

Waiting for 9.1 – Per-column collation support

On 8th of February, Peter Eisentraut committed patch:

Per-column collation support
 
This adds collation support for columns and domains, a COLLATE clause
to override it per expression, and B-tree index support.
 
Peter Eisentraut
reviewed by Pavel Stehule, Itagaki Takahiro, Robert Haas, Noah Misch
 
Branch
------
master

Continue reading Waiting for 9.1 – Per-column collation support

Waiting for 8.4 – database-level lc_collation and lc_ctype

On 23rd of September, Heikki Linnakangas committed patch that was written by Radek Strnad (actually committed patch is a stripped-down version of original).

What it does? It adds ability to have (finally!) different collation order and character categories for different databases.

Continue reading Waiting for 8.4 – database-level lc_collation and lc_ctype