e21156a754
* 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. |
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| Cargo.toml | ||
| README.md | ||
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.