On Fri, Nov 17, 2017 at 09:32:23PM +0100, Luca Ferrari wrote:
> Hi all,
> maybe this is trivial, but I need an hint on a way to see a table form
> of the MCVs and MCFs out of pg_stats with a query. Is it possible to
> get a set of rows each with a most common value on one column and the
> corresponding column on the the other? (assuming I can cast the array
> of MCVs to the right type array)
I think you want something like this ?
postgres=# SELECT schemaname, tablename, attname,
unnest(histogram_bounds::text::text[]), histogram_bounds FROM pg_stats LIMIT 9;
pg_catalog | pg_pltemplate | tmplname | plperl |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | plperlu |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | plpgsql |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | plpython2u |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | plpython3u |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | plpythonu |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | pltcl |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplname | pltclu |
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
pg_catalog | pg_pltemplate | tmplhandler | plperl_call_handler |
{plperl_call_handler,plperlu_call_handler,plpgsql_call_handler,plpython2_call_handler,plpython3_call_handler,plpython_call_handler,pltcl_cal
l_handler,pltclu_call_handler}
Justin
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