| ColumnComparator |
Compare the values from a column in two rows
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| Engine |
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.
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| MemoryData |
An implementation of Data that stores the complete result in memory
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| RewindableData |
Allow the data to be restarted
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| SelectEngine |
SelectEngine is able to execute a select query
TODO replace all runtime exceptions with sql exceptions
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| Tests |
Tests cases for the engine itself
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