Horton

Fix example plan in optimizer/README.

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

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Commit: 3c821466abcdb8120ab0dfbce02f3bbae3b62025
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-01-23T14:38:36Z
Releases: 10.0 
Fix example plan in optimizer/README.

Joining three tables only takes two join nodes.  I think when I (tgl)
wrote this, I was envisioning possible additional joins; but since the
example doesn't show any fourth table, it's just confusing to write
a third join node.

Etsuro Fujita

Discussion: https://postgr.es/m/e6cfbaa3-af02-1abc-c25e-8fa5c6bc4e21@lab.ntt.co.jp

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src/backend/optimizer/README modified +2 −3

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