Architecture
The SQL grammar is described in grammar.py, the binding of the grammar constructs to semantic objects is performed in bindings.py, the semantic objects and their execution strategies is defined in semantics.py. The semantics use a lot of classical and non-classical logic (cylindric logic) as well as optimization heuristics to define a relatively efficient and correct implementation of SQL.
The most basic data structures of the implementation are given in either kjbuckets0.py or the faster kjbucketsmodule.c, which implement the same data type signatures in Python and in a C extension to Python respectively.
The database.py module is a simple wrapper that provides a standard DBAPI interface to the system.
The test suite test/test_gadfly.py attempts to provide a regression test and a demonstration of the system.
The SQL parser also requires the kwParsing parser generation package, which consists of a number of additional python modules.
Read more about this topic: Gadfly (database)
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