and...@tao11.riddles.org.uk writes:
> The handling of freq_null for estimating IS NOT TRUE/FALSE for boolean
> columns which are all null or almost all null (enough that analyze doesn't
> find any non-null values to put in MCV) is completely off in the weeds.

Doh, definitely a bit of brain fade there :-(

> Suggested fix at:
> https://gist.github.com/RhodiumToad/5901567

Seems reasonable, will fix.

                        regards, tom lane


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