>>>Hannu Krosing said:
> Tom Lane kirjutas N, 23.01.2003 kell 02:04:
> > We already do cache column offsets when they are fixed. The code that's
> > the problem executes when there's a variable-width column in the table
> > --- which means that all columns to its right are not at fixed offsets,
> > and have to be scanned for separately in each tuple, AFAICS.
>
> Not only varlen columns, but also NULL columns forbid knowing the
> offsets beforehand.
Does this mean, that constructing tables where fixed length fields are
'before' variable lenght fields and 'possibly null' fields might increase
performance?
Daniel
