Karel,

>  If I see this I must agree with Peter that to_char() is something
>  other than "interval" to "interval-as-string" convertor. The current
>  code use date/time as complex of date/time information _based_ on
>  calendar practice --
>  The other words: current to_char(interval) is interval to calendar
>  date/time convertor.

Currently, yes.   The reason why I'm advocating for a change is:

1) I can't imagine of what use the current behavior could possibly be.  Is 
there anyone at all using the current output of to_char(interval)?

2) to_char() is also used for converting numeric values to strings.   It is 
not in some way tied to date/time from a schema perspective, although it may 
be codewise.

>  I think we can do with the current to_char(interval):
>
>     a) maintain it as "interval" to "calendar date/time string" convertor,
>     b) if nobody wants to use it as a) we can delete it from sources
>        and don't waste our time with it and use our time to real
>        "interval" convertor.

This sounds reasonable to me.  I'll even do a survey on the SQL list to see if 
anyone there is using the current behavior.

-- 
Josh Berkus
Aglio Database Solutions
San Francisco


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