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Mention statistics objects in maintenance.sgml

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The docs mentioned expression indexes as a way to improve selectivity
estimates for functions, but we have a second option to improve that by
creating extended statistics. So mention that too.

Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/20210505210947.GA27406%40telsasoft.com
This commit is contained in:
Tomas Vondra 2021-05-07 14:02:22 +02:00
parent 93f9af1387
commit 44f90ad092
1 changed files with 2 additions and 1 deletions
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doc/src/sgml/maintenance.sgml
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@ -330,7 +330,8 @@
<para>
Also, by default there is limited information available about
the selectivity of functions. However, if you create an expression
the selectivity of functions. However, if you create a statistics
object or an expression
index that uses a function call, useful statistics will be
gathered about the function, which can greatly improve query
plans that use the expression index.