The current version of Qcodo already supports MetaDataGrid which has really easy filtering capability... all that's missing is the documentation for it. I hope to have a write-up for it in the next day or so.
The next version of Qcodo will add a few additional features and functionality which will make filtering even easier than it already is with MetaDataGrid. These additional features will simply be add-ons to the existing MetaDataGrid mechanism.
What VexedPanda is talking about is an implementation of his well-received FilteredDataGrid which he has placed into the QCubed framework (which is a fork of Qcodo) which I believe has a slightly different approach than the MetaDataGrid approach of Qcodo (however, don't quote me on this yet). I do plan on looking into his FilteredDataGrid approach soon as a bunch of us look into a lot of the proposed changes that are on the table for the meta controls, qcodo query, etc.
Hope that clears things up a bit -- please do post if you have any additional questions.