Doc: improve documentation about run-time pruning's effects on EXPLAIN.

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

Commit: 731ab0a284f43048f66516d5b3b642819035ba1a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-12-08T15:36:29Z
Releases: 11.7
Doc: improve documentation about run-time pruning's effects on EXPLAIN.

Tatsuo Ishii complained that this para wasn't very intelligible.
Try to make it better.

Discussion: https://postgr.es/m/20191207.200500.989741087350666720.t-ishii@sraoss.co.jp

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doc/src/sgml/perform.sgml modified +10 −9

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