Can someone confirm a suspicion for me ?
I have a moderately sized table (20+ columns, 3MM rows) that tracks tags.
I have a lower(column) function index that is used simplify case-insensitive
lookups.
CREATE INDEX idx_tag_name_lower ON tag(lower(name));
I have a few complex queries
Jonathan Vanasco postg...@2xlp.com writes:
Am I correct in observing that the value of a function index can't be used
for sorting ?
No ...
regression=# create table tt (f1 int, f2 text);
CREATE TABLE
regression=# create index on tt (lower(f2));
CREATE INDEX
regression=# explain select * from
On Dec 12, 2014, at 4:58 PM, Tom Lane wrote:
regression=# create table tt (f1 int, f2 text);
CREATE TABLE
regression=# create index on tt (lower(f2));
CREATE INDEX
regression=# explain select * from tt order by lower(f2);
QUERY PLAN
Jonathan Vanasco postg...@2xlp.com writes:
Thank you so much for posting this test.
I got a seq scan on my local machine, so I checked the version... still
running 9.2.4.
I tried it on production (which is 9.3.x) and got the same result as you.
Hmm, well, I get the same result from 9.2.9,
