Data represents a set of rows containing data
DataSource represents the data store.
Compare the values from a column in two rows
Engine is the entry point into a java based database backend The datastore for the data is un-important since the engine communiates with the data via a set of defined interfaces.
An implementation of Data that stores the complete result in memory
Allow the data to be restarted
SelectEngine is able to execute a select query TODO replace all runtime exceptions with sql exceptions
Tests cases for the engine itself
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