Tom Lane [EMAIL PROTECTED] writes:
On the other side of the coin, there's the analogy to GROUP BY that Greg
points out --- there's some duplicated functionality there, but again it
doesn't carry over to DISTINCT ON, AFAICS.
The equivalent query for:
SELECT DISTINCT ON (x,y) a,b,c FROM ...
Hi Beth,
Beth Jen [EMAIL PROTECTED] writes:
Right now, the distinct clause adds its targets to the sort clause list when
it is parsed.
Yeah, the DISTINCT/DISTINCT ON implementation is currently rather
tightly tied to sorting :-(. This is ancient code and badly in need of
redesign, but it's
Hello,
My name is Beth Jen and I'm a Summer of Code student currently adding a
hash-based implementation of DISTINCT to PostgreSQL. My prototype is
near completion, and the current design is as follows:
I've
created a new exec node that uses hash table functions in execGrouping.
The node simply
On Fri, Jul 07, 2006 at 01:25:53PM -0400, Beth Jen wrote:
Right now, the distinct clause adds its targets to the sort clause list when
it is parsed. This causes an automatic insertion of the sort node into the
query plan before the application of the unique node. The hash-based
implementation
Martijn van Oosterhout kleptog@svana.org writes:
On Fri, Jul 07, 2006 at 01:25:53PM -0400, Beth Jen wrote:
Right now, the distinct clause adds its targets to the sort clause list when
it is parsed. This causes an automatic insertion of the sort node into the
query plan before the
