08d2c613a4
This commit: - Defines a new kind of column, distinct from the eavt columns in `DatomsColumn`, to model the rows projected from subqueries. These always name one of two things: a variable, or a variable's type tag. Naturally the two cases are thus `Variable` and `VariableTypeTag`. These are cheap to clone, given that `Variable` is an `Rc<String>`. - Defines `Column` as a wrapper around `DatomsColumn` and `VariableColumn`. Everywhere we used to use `DatomsColumn` we now allow `Column`: particularly in constraints and projections. - Broadens the definition of a table list in the intermediate "query-sql" representation to include a SQL UNION. A UNION is represented as a list of queries and an alias. - Implements translation from a `ComputedTable` to the query-sql representation. In this commit we only project vars, not type tags. Review comment: discuss bind_column_to_var for ValueTypeTag. Review comment: implement From<Vec<T>> for ConsumableVec<T>. |
||
|---|---|---|
| .. | ||
| src | ||
| tests | ||
| Cargo.toml | ||
| README.md | ||
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.