[Pytables-users] Combining in-kernel queries with out-of-core computations

[Jon W. <js...@fn...>]

Hi all,
In looking through the docs, I see two very nice features: the .where() 
query method, and the tables.Expr computation mechanism.  But, it 
doesn't appear to be possible to combine the two.  It appears that, if I 
want to compute some function of my columns, but only for certain rows, 
I have two options.
  - I can use tables.Expr to compute the function, and then filter the 
results in python
  - I can use mytable.where() to select the rows I'm interested in, and 
then compute the function in python

Am I missing anything?  Is it possible to perform fast out-of-core 
computations with numexpr, but only on a subset of the existing rows?
Regards,
Jon Wilson