Re: very long record lines in expanded psql output

Hi!

> a) with line cursor

Tried in different configurations, seems that line cursor works fine.

> b) format detection - I try to detect the header line - and I expect this
> line has the most length of all lines. I use a line with the same length as
> the column's type info (data, border).

I looked at pspg source, and here's what I found (please correct me if some/all
of my assumptions are wrong):

1. Input handling and format detection happens in table.c readfile().

2. There's some variables in DataDesc - maxx and maxbytes - that store the
longest line seen so far. But they are re-updated on each new row, so the fact
that header is shorter shouldn't affect them.

3. Expanded header detection is handled by is_expanded_header function. It has
ei_minx and ei_maxx return pointers, but when it is used from readfile() these
pointers are set to NULL in both cases - so header length is simply ignored.

> Did you test the wrapped format? It is working
>
> \pset format wrapped
> \x
> select * from pg_class;

There's no difference in outputs in wrapped format, so pspg behavior is also unaffected.

By the way, it seems that pspg recommends setting \pset border 2 anyway, so in vast
majority of cases there should be no possibility of difference at all - proposed patch
doesn't change output for \pset border 2 (because there's no sane way of making it
look okay in presence of long fields anyway).

Best regards,
Platon Pronko