Re: contrib/intarray vs empty arrays

>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:
[empty arrays and containment ops]
Tom> From what I understand of GIN's internal workings, this isTom> unfixable because there is nothing to make an index
entryonTom> when looking at an empty array.  Unless you know of a trick toTom> get around that, we've got a problem
here.

Umm. In theory, could the extract function return some distinct
value when applied to an empty array, and the extract_query function
include the same value when extracting a query?

It's not very clean, since it means that the element type for an
index of sometype[] is no longer sometype, but it would allow the
semantics to be kept consistent.

[whether it is worth the pain of doing this is a separate question]

-- 
Andrew (irc:RhodiumToad)