On 12/22/2010 10:00 AM, Simon Riggs wrote:
7. Why does ANALYZE skip foreign tables? Surely its really important we
know things about a foreign table, otherwise we are going to optimize
things very badly.
Quite apart from other reasons, such as possible ephemerality of the
data, the difficulty of taking a reasonable random sample from an
arbitrary foreign data source seems substantial, and we surely don't
want ANALYSE to have to run a full sequential scan of a foreign data source.
I think we need something that estimates the size of a table, at least,
otherwise queries will be completely un-optimised.
Perhaps we could allow FDWs to register a size estimation function. Does
this need to be done on the first go round? Time is running a bit short.
cheers
andrew
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