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Donald H. (Donnie) Pinkston, III authored
The design document and information document are included under the doc directory now. Added a lot of documentation, particularly to the Schema class. Made a few changes to the ArithmeticOperator and BooleanOperator classes' simplify() methods so that we can do some basic simplifications. Added the StatisticsUpdater so that it's easier for students to modify statistics based on selection predicates. Fixed a bug in SelectClause where ORDER BY clauses were using the FROM-clause schema rather than the SELECT-clause schema.
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