> No, that tests whether the particular tuple contains any null fields, not
> whether the whole table is declared NOT NULL.
>                         regards, tom lane

Ok, thanks, that makes sense.

My question kind of remains though - does that mean that having any nulls
in the tuple loses the ability to use the tupleDesc cache? and how much of
a performance impact is this?  I'm sure there's a good reason why you can't
really use the cache if you have a null column, just was curious of the
implications.  Thanks again!

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