AIP 160: x != 'some string' filtering when x is nullable

[Bu3a3a]

Hi!

There is a "!=" operator. It's not clear for me how it should work when filtering nullable values.

For example:

x - nullable string field
filter: x != 'abc'

Should response contain objects where x is null?
I.e. should null values be treated as comparable and hence present in the response or not (e.g. some DB do not return null values if it's queried with !=).

Any clarification is appreciated.

[FraserHum]

I would assume that the objects where x is null would be returned, if the user wanted to exclude those they should use a more specific filter like x != null AND x != 'abc'