Well, you're obviously right - I didn't know this. I guess I've found
that the index is not used for null values, and deduced somehow that
NULL values are not stored in the index.
Thanks, it's nice to find out a 'bug' before it's too late :-)
regards
Tomas
Are you sure NULL values are not stored? btree, gist and bitmap index
and search for NULL values.
select amname, amindexnulls, amsearchnulls from pg_am;
amname | amindexnulls | amsearchnulls
--------+--------------+---------------
btree | t | t
hash | f | f
gist | t | t
gin | f | f
bitmap | t | t
(5 rows)
Sincerely yours,
Vladimir Sitnikov
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