Heuristics Based Logical Query Optimizer

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HeFQUIN uses a heuristics-based query optimizer for its logical plans. The relevant source code can be found in the se.liu.ida.hefquin.engine.queryproc.impl.loptimizer package and its sub-packages.

Heuristics that are currently implemented:

• Union pull-up

Heuristics still to be implemented:

• Filter push-down