Re: [HACKERS] Does having a NULL column automatically exclude the table from the tupleDesc cache?

[Ryan Murphy]

> attcacheoff can only be set positive for fields preceding any varlena
> (typlen<0, but including the first such) or nullable values.  I don't
> know how much faster it is with the cache; you can measure it if your
> curiosity is strong enough -- just set the first column to nullable.
>
>
Thanks!  Maybe I'll do some benchmarks.