delta/python-packages/sqlalchemy.git, branch attempt_c_loading

- attempt to write part of _populate_full in C. Performance difference

2014-08-29T23:07:27+00:00

is pretty much zippo!  1%.  to use C code here would require a much more
fundamental rewrite of everything so that we aren't just calling python
functions.

- pull out populators back into separate functions, though still very inlined

2014-08-29T21:46:57+00:00

- further move things vertically, at which point things are inlined enough

2014-08-29T20:57:12+00:00

that I'd like to start de-inlining again in the hopes of making this readable.

- need to use safe_discard() at least in _restore_snapshot(), let's use it

2014-08-29T20:32:08+00:00

everywhere in Session since the optimized one only applies to loading

- use default dialect for compile test here

2014-08-29T20:29:46+00:00

- defaultdict benchmarks faster than a namedtuple; OK

2014-08-29T20:28:19+00:00

- inline the column-based expiration operations as well

- reorganize how create_row_processor() communicates up to

2014-08-29T19:07:11+00:00

instances(), using a named tuple it can assign to directly.  this way
we never have to worry about that structure changing anymore, though
we are still having it append (key, fn) which is kind of awkward.
- inline _populators() into instance(), it's a little verbose but
saves an fn call

- re-establish and test some behavior from previous versions, that

2014-08-29T18:25:09+00:00

if a load() or refresh() event changes history (which...why...but anyway)
the state of the object is the same; currently it seems that history
gets reset but on a refresh, the object still goes into session.dirty
- simplify what we store in partials

- The :class:`.Query` will raise an exception when :meth:`.Query.yield_per`

2014-08-29T18:01:38+00:00

is used with mappings or options where eager loading, either
joined or subquery, would take place.  These loading strategies are
not currently compatible with yield_per, so by raising this error,
the method is safer to use - combine with sending False to
:meth:`.Query.enable_eagerloads` to disable the eager loaders.

- we've got 25% improvement so let's talk about it

2014-08-29T17:35:25+00:00