Along the lines of the equality operator; I have ran into issues trying to
pivot a table/result set with a json type due what seemed to be no equality
operator.
On Nov 4, 2013 10:14 AM, "Merlin Moncure"
<mmonc...@gmail.com<javascript:_e({}, 'cvml', 'mmonc...@gmail.com');>>
wrote:
> On Fri, Nov 1, 2013 at 1:50 PM, Tom Lane
> <t...@sss.pgh.pa.us<javascript:_e({}, 'cvml', 't...@sss.pgh.pa.us');>>
> wrote:
> > Gregory Haase <haa...@onefreevoice.com <javascript:_e({}, 'cvml',
> 'haa...@onefreevoice.com');>> writes:
> >> The json_data column is not accounted for in pg_stats:
> >
> > Ah! I hadn't twigged to the fact that your bloat measurement approach
> > assumed you had pg_stats entries for all the columns.
> >
> >> So I'm not sure if I'd actually qualify this as a "bug", but it appears
> >> that there is no way to currently get stats on a json data type.
> >
> > ANALYZE currently punts on columns that don't have an equality operator,
> > which json does not. There isn't that much in the way of stats that we
> > could collect, though I suppose we could still compute average datum
> width
> > and null fraction.
> >
> > I'm not sure whether there are plans to invent an equality operator for
> > json.
>
> IMNSO, this may not be a bug, but it's pretty close. All base types
> should have equality operator as well as other supporting
> infrastructure that the database itself depends on (in/out and
> send/receive for example). This is a pretty good example of why.
>
> merlin
>
>
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