On 01/30/2017 09:37 PM, Alvaro Herrera wrote:
Tomas Vondra wrote:
The 'built' flags may be easily replaced with a check if the bytea-like
columns are NULL, and the 'enabled' columns may be replaced by the array of
char, just like you proposed.
That'd give us a single catalog looking like this:
pg_mv_statistics
starelid
staname
stanamespace
staowner -- all the above as currently
staenabled array of "char" {d,f,s}
stakeys
stadeps (dependencies)
standist (ndistinct coefficients)
stamcv (MCV list)
stahist (histogram)
Which is probably a better / simpler structure than the current one.
Looks good to me. I don't think we need to keep the names very short --
I would propose "standistinct", "stahistogram", "stadependencies".
Yeah, I got annoyed by the short names too.
This however reminds me that perhaps pg_mv_statistic is not the best
name. I know others proposed pg_statistic_ext (and pg_stats_ext), and
while I wasn't a big fan initially, I think it's a better name. People
generally don't know what 'multivariate' means, while 'extended' is
better known (e.g. because Oracle uses it for similar stuff).
So I think I'll switch to that name too.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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