rusqlite must have just returned the data itself rather than relying on
the Result type to communicate failures to callers. Fixing that here,
albeit in a fragile way.
RowIndex must have just been an alias over i32, but now it's a trait
implemented on str and usize, so we need to change mentat's internal
type alias for it to a usize.
This also patches our CI test script to only run "--feature sqlcipher"
tests on sub-crates which expose this feature (i.e. themselves rely on rusqlite).
Right now, we write code like
```rust
match q_once(q, inputs)?.into_tuple()? {
Some(vs) => match (vs.len(), vs.get(0), vs.get(1)) {
(2, &Some(Binding::Scalar(TypedValue::Long(a))), &Some(Binding::Scalar(TypedValue::Instant(ref b)))) => Some((a, b.clone())),
_ => panic!(),
},
None => None,
}
```
to length-check tuples coming out of the database. It can also lead
to a lot of cloning because references are the easiest thing to hand.
This commit allows to write code like
```rust
match q_once(q, inputs)?.into_tuple()? {
Some((Binding::Scalar(TypedValue::Long(a)), Binding::Scalar(TypedValue::Instant(b)))) => Some((a, b)),
Some(_) => panic!(),
None => None,
}
```
which is generally much easier to reason about.
This is a big deck-chair re-arrangement. This puts FindQuery into
query-algebrizer and puts the validation from ParsedFindQuery ->
FindQuery their as well.
Some tests were re-homed for this.
In addition, the little-used maplit crate dependency was replaced with
inline expressions.
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`.
* Make properties on NamespacedKeyword/NamespacedSymbol private
* Use only a single String for NamespacedKeyword/NamespacedSymbol
* Review comments.
* Remove unsafe code in namespaced_name.
Benchmarking shows approximately zero change.
* Allow the types of ns and name to differ when constructing a NamespacedName.
* Make symbol namespaces optional.
* Normalize names of keyword/symbol constructors.
This will make the subsequent refactor much less painful.
* Use expect not unwrap.
* Merge Keyword and NamespacedKeyword.
* Refactor AttributeCache populator code for use from pull.
* Pre: add to_value_rc to Cloned.
* Pre: add From<StructuredMap> for Binding.
* Pre: clarify Store::open_empty.
* Pre: StructuredMap cleanup.
* Pre: clean up a doc test.
* Split projector crate. Pass schema to projector.
* CLI support for printing bindings.
* Add and use ConjoiningClauses::derive_types_from_find_spec.
* Define pull types.
* Implement pull on top of the attribute cache layer.
* Add pull support to the projector.
* Parse pull expressions.
* Add simple pull support to connection objects.
* Tests for pull.
* Compile with Rust 1.25.
The only choice involved in this commit is that of replacing the
anonymous lifetime '_ with a named lifetime for the cache; since we're
accepting a Known, which includes the cache in question, I think it's
clear that we expect the function to apply to any given cache
lifetime.
* Review comments.
* Bail on unnamed attribute.
* Make assert_parse_failure_contains safe to use.
* Rework query parser to report better errors for pull.
* Test for mixed wildcard and simple attribute.
* Pre: clean up core/src/lib.rs.
* Pre: use indexmap 1.0 in db and query-projector.
* Change rel results to be a RelResult instance, not a Vec<Vec<TypedValue>>.
This avoids memory fragmentation and improves locality by using a single
heap-allocated vector for all bindings, rather than a separate
heap-allocated vector for each row.
We hide this abstraction behind the `RelResult` type, which tracks the
stride length (width) of each row.
* Don't allocate temporary vectors when projecting RelResults.
Gregory Burd
