Add hash support functions and hash opclass for contrib/ltree.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 485f0aa85995340fb62113448c992ee48dc6fff1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2024-03-21T22:27:49Z
Releases: 17.0
Add hash support functions and hash opclass for contrib/ltree.

This also enables hash join and hash aggregation on ltree columns.

Tommy Pavlicek, reviewed by jian he

Discussion: https://postgr.es/m/CAEhP-W9ZEoHeaP_nKnPCVd_o1c3BAUvq1gWHrq8EbkNRiS9CvQ@mail.gmail.com

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