Doc: add a bit to indices.sgml about what is an indexable clause.

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

Commit: b4c147ac6fd5238d2c49b6369d555f29dbfc9144
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-12-17T21:49:44Z
Releases: 13.14
Doc: add a bit to indices.sgml about what is an indexable clause.

We didn't explain this clearly until somewhere deep in the
"Extending SQL" chapter, but really it ought to be mentioned
in the introductory material too.

Discussion: https://postgr.es/m/4097442.1694967650@sss.pgh.pa.us

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doc/src/sgml/indices.sgml modified +34 −1

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