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* Pre: refactor projector code. * Part 1: maintain 'with' variables in AlgebrizedQuery. * Part 2: include necessary 'with' variables in SQL projection list. The test produces projection elements for `:with`, even though there are no aggregates in the query. This test will need to be adjusted when we optimize this away! |
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This module handles the derivation from an algebrized query of two things:
- A SQL projection: a mapping from columns mentioned in the body of the query to columns in the output.
- A Datalog projection: a function that consumes rows of the appropriate shape (as defined by the SQL projection) to yield one of the four kinds of Datalog query result.
These two must naturally coordinate, and so they are both produced here.