> > I've been trying to figure out whether null values are indexed or
> from
> > the documentation. I was under the impression, that null values are
> > stored in the index.
> You're mistaken, at least with regard to btree indexes.

hmm. I tried several different ways to filter/extract null values from
an indexed key and got a seq scan every time.  The only way I could
query for/against null values was to convert to bool via function.

However I did a partial exclusion on a 1% non null value really big
table and index size dropped as expected.


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