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InfluxDB
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During the conversion, Apache Calcite produces a tree of logical relational operators, are abstract and do not target any specific execution backend. For this reason, logical operators always have the convention trait set to Convention.NONE. It is expected that you will convert them into physical operators during the optimization. Physical operators have a specific convention different from Convention.NONE.
In this example, we will optimize the TPC-H query №6. The full source code is available here. Run the OptimizerTest to see it in action.