docs: adjust multi-column most-common-value statistics

Bruce Momjian <bruce@momjian.us>

Commit: 7e0fb165dd2447f83464833e63e646d2771edb15
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-09-30T17:44:22Z
Releases: 13.0
docs:  adjust multi-column most-common-value statistics

This commit adds a mention that the order of columns specified during
multi-column most-common-value statistics is insignificant, and tries to
simplify examples.

Discussion: https://postgr.es/m/20190828162238.GA8360@momjian.us

Backpatch-through: 12

Files

PathChange+/−
doc/src/sgml/perform.sgml modified +3 −3
doc/src/sgml/ref/create_statistics.sgml modified +2 −1

Documentation touched