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This uses a `SELECT *` from an inner subselect to filter potentially `NULL` aggregates. The alternative is to handle `NULL` values throughout the projector, which is simple but loses a valuable invariant: Mentat SQL queries produce values that are not `NULL`. |
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This crate turns an algebrized Datalog query into a domain-specific representation of a SQL query, and then uses mentat_sql to turn that into a SQL string to be executed.
This subsumes both planning and query construction, because in Mentat the SQL query is effectively a query plan.