On Fri, Oct 26, 2018 at 12:27 PM Jeff Janes <jeff.ja...@gmail.com> wrote:

Here is a real-world example from one of my databases where each value is
> about 17 characters long, and is present about 20 times:
>
> gin: 411 MB
> btree: 2167 MB
> hash: 2159 MB
>

For what it is worth, that was 9.6 with freshly rebuilt indexes.

On 11.0 with freshly rebuilt indices, the hash index does get a bit smaller:

gin: 411 MB
btree: 2167 MB
hash: 1864 MB

Cheers,

Jeff
>
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