Tom Lane wrote:

> We have also talked about solving the multi-column statistics problem
> (which, at its core, is "which combinations of columns are worth
> accumulating stats for?" --- you can't possibly store stats for every
> combination!) by having what would amount to hints from the DBA saying
> "keep stats for these combinations".

This strikes me intuitively as the most likely candidate so far for
improvement. I'm much more interested in schemes that will improve the
stats system, rather than providing a way around it.



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