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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
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Tomas Vondra 2021-05-07 14:02:22 +02:00
parent 93f9af1387
commit 44f90ad092
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doc/src/sgml/maintenance.sgml
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@ -330,7 +330,8 @@
<para> <para>
Also, by default there is limited information available about 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 index that uses a function call, useful statistics will be
gathered about the function, which can greatly improve query gathered about the function, which can greatly improve query
plans that use the expression index. plans that use the expression index.