On 2/15/17 1:37 PM, Ryan Murphy wrote:
>
> 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.
You'll probably want to do those at a C level, bypassing the executor. I
would guess that executor overhead will completely swamp the effect of
the cache in most cases.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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