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Before statement compilation, empty filters are removed from group
filters, and childless group filters become empty filters.
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Previously, we generated negative subqueries by integrating them into
the main statement normally, and then making the connecting join be a
LEFT JOIN instead of an INNER JOIN, and by adding a condition that the
join column be NULL. The problem with this is that if the top table of
the subquery joins against any other table (which join throughs always
do), then no rows will be returned. This was solved by putting the
subquery into a CTE and then LEFT JOINing as before with the CTE.
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The new object structure was designed to build on the existing WordNet
structure, while also adding in all of the data that we get from other sources.
More information about this can be found on the project wiki.
The generator has already been completely rewritten to generate a
datafile that uses the new structure. In addition, a number of indexes
are created, which does double the size of the datafile, but also allows
for much faster lookups. Finally, the new generator is written modularly
and is a lot more readable than the old one.
The verbly interface to the new object structure has mostly been
completed, but has not been tested fully. There is a completely new
search API which utilizes a lot of operator overloading; documentation
on how to use it should go up at some point.
Token processing and verb frames are currently unimplemented. Source for
these have been left in the repository for now.
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