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f149b40e75
This PR improves the DBSP circuit so that it handles the JOIN operator. The JOIN operator exposes a weakness of our current model: we usually pass a list of columns between operators, and find the right column by name when needed. But with JOINs, many tables can have the same columns. The operators will then find the wrong column (same name, different table), and produce incorrect results. To fix this, we must do two things: 1) Change the Logical Plan. It needs to track table provenance. 2) Fix the aggregators: it needs to operate on indexes, not names. For the aggregators, note that table provenance is the wrong abstraction. The aggregator is likely working with a logical table that is the result of previous nodes in the circuit. So we just need to be able to tell it which index in the column array it should use.