Re: tolog for TMQL

* Robert Barta
> 
> Parsing or processing-time "not legal"?

We never really decided. It could be either. If you turn off the reordering optimizer, I think it's runtime. If you leave it on, I think it's compile-time. Certainly it's trivial to make it compile-time.

> [ BTW: I cannot remember having seen subquery functionality in tolog. ]

It's not there. It probably should be. 

I see no major obstacles to adding it. 

> The issue is - as always - the _locality_ of the information. Here I
> still contend that PEs - by definition - have a narrower/constrained
> way to pass on information.

If your point is that tolog requires a global analysis of the query to tell whether variables are used elsewhere or can be safely optimized away then that's certainly true.

Whether that's an impediment worthy of note is a different point. It's not difficult, and collecting this sort of information is useful in a number of different ways in any case.

--Lars M.
http://www.garshol.priv.no/tmphoto/
http://www.garshol.priv.no/blog/