Re: Plan for CSV handling of quotes, NULL

Bruce Momjian wrote:
> I talked to Andrew on IRC and we went over the open CSV issues.
>
> We talked about how we could do quoting for zipcode in TEXT fields and
> not quote true numeric values without hardcoding datatypes into the
> system.  The most tricky case was NUMERIC vs. TEXT with zipcodes.
> NUMERIC and TEXT have almost identical pg_type entries, so there is
> nothing there to help us.
>
> I found parse_coerce.c::TypeCategory(), which contains information about
> which data type oids are in which grouping, e.g. DATETIME, STRING,
> NUMERIC, etc.  It seems that function, if called with
> pg_type.typbasetype could help determine if quotes should be used.  My
> idea is to skip quotes for NUMERIC and DATETIME types, and quote
> everything else.  This means that user-defined types will always be
> output with quotes, which is probably OK.
>
> So, for open CSV items we have:
>
>     o  add oid dump/reload
>     o  handle loading of comma-comma into NOT NULL collumns
>     o  handle quoting of TEXT type with zipcodes, etc.

Oh, one more item.  CSV needs a way to output date values in Datestyle
format, for use by spreadsheets that understand mm/dd/yy dates, but not
ISO dates.  This will not be on by default.

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