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Commit44f90ad

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Mention statistics objects in maintenance.sgml
The docs mentioned expression indexes as a way to improve selectivityestimates for functions, but we have a second option to improve that bycreating extended statistics. So mention that too.Reported-by: Justin PryzbyDiscussion:https://postgr.es/m/20210505210947.GA27406%40telsasoft.com
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‎doc/src/sgml/maintenance.sgml

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<para>
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Also, by default there is limited information available about
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the selectivity of functions. However, if you create an expression
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the selectivity of functions. However, if you create a statistics
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object or an expression
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index that uses a function call, useful statistics will be
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gathered about the function, which can greatly improve query
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plans that use the expression index.

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