Alex Vandiver aebc9081b8 migrations: Generate statistics for subject vs channel-messages. ...

These extended statistics allow the query planner to know that the
prevalence of empty topics is very different in DMs, as opposed to
channel messages.  The `ALTER STATISTICS` adjusts the size of the
"most common value" list -- it must be large enough to include the
empty-topic channel messages to be fully effective.  Having this list
be over-large does not carry much risk, however.

The `ANALYZE zerver_message` step may be quite slow.

2025-03-19 09:39:20 -07:00

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