On Mon, Mar 10, 2014 at 1:18 PM, Peter Geoghegan <pg@heroku.com> wrote:
* The jsonb_hash_ops non-default GIN opclass is broken. It has its own
idiosyncratic notion of what constitutes containment, that sees it only return, say, jsonb arrays that have a matching string as their "leftmost" element (if we ask it if it contains within it another array with the same string). Because of the limited number of indexable operators (only @>), I'd put this opclass in the same category as GiST in terms of my willingness to forgo it for a release, even if it did receive a loud applause at pgConf.EU. Again, it might be some disparity between the opertors as they existed in hstore2 at one time, and as they exist in the core code now, but I doubt it, not least since the regression tests didn't pick this up, and it's such a basic thing. Perhaps Oleg and Teodor just need to explain this to me.
I din't get comment about "leftmost" element. There is absolutely no distinguish between array elements. All elements are extracted into same keys independent of their indexes. It seems to have no change since I wrote hstore_hash_ops. Could you share test case to illustrate what you mean?