ContinuumIO/blaze — pull request #814 by mrocklin (2014-11-06 16:34:20+00:00)
Title: Truncation

For binning operations we want truncation operations. This is important both for arithmetic truncation

```Python
>>> from blaze import Symbol, compute
>>> x = Symbol('x', 'real')
>>> compute(x.truncate(10), 123)
120
>>> compute(x.truncate(0.1), 3.1415)
3.1
```

And for datetime truncation (in progress)

Datetime truncation seems to be pretty doable in Pandas / NumPy. Python is a bit more of a pain. No clue on SQLAlchemy. Presumably we'd have to go into each of the databases independently.