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Visual COKO: a debugger for query optimizer development


Daniel J. Abadi and Mitch Cherniack

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Abstract

.COKO is a programming language designed for query optimizer development. Programming languages require debuggers, and in this demonstration, we illustrate our COKO debugger: Visual COKO. Visual COKO enables a query optimization developer to visually trace the execution of a COKO transformation. At every step of the transformation, the developer can view a tree-display that illustrates how the original query expression has evolved.


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