it be?  So far we've ruled out using the planner to prevent index
scans when the pending list is long (because it's not reliable) and
cleaning up the pending list during insert when needed (because it
won't work with Hot Standby).  We haven't decided what WILL work,

During insert it will work with Hot Standby because there is no any limitation for number of pages touched or WAL records. There is a problem with cleanup invoked by gingettuple - slave could not start cleanup process at all and hence it could emit an error if tidbitmap becomes lossy.

--
Teodor Sigaev                                   E-mail: teo...@sigaev.ru
                                                   WWW: http://www.sigaev.ru/

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