2018-03-09 0:10 GMT-03:00 PG Doc comments form <noreply@postgresql.org>:
> From testing, it seems like PostgreSQL supports the syntax "IS NOT DOCUMENT"
> in addition to "IS DOCUMENT", similar to "IS NOT NULL", "IS NOT FALSE", etc,
> however this does not appear to be documented, only "IS DOCUMENT" is.
>
It has been like that since day 1. I'm not sure why it was not
documented. It already has some tests. I'll bet that was an oversight.
Should we repeat the statement in another item (like the attached
patch)? Another option is to add a statement in the "IS DOCUMENT"
item. I'm afraid that NULL return wouldn't be clear.
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