Commit graph

37 commits

Author SHA1 Message Date
Nick Alexander
d4166cc67c Part 6: Remove query-parser entirely. 2018-06-04 15:04:39 -07:00
Nick Alexander
47441f56dc Part 5: Push FindQuery into query-algebrizer; structure errors.
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.
2018-06-04 15:04:39 -07:00
Nick Alexander
d8d18a1731
[query] Handle SQL NULL for aggregates over 0 rows. (#684) (#688) r=rnewman
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`.
2018-06-01 14:17:31 -07:00
Richard Newman
3dc68bcd38 Combine NamespacedKeyword and Keyword. (#689) r=nalexander
* 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.
2018-05-11 09:52:17 -07:00
Richard Newman
e21156a754
Implement simple pull expressions (#638) r=nalexander
* 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.
2018-05-04 12:56:00 -07:00
Richard Newman
a2e13f624c
Add 'Binding', a structured value type to return from queries. (#657) r=nalexander
Bump to 0.7: breaking change.
2018-04-24 15:08:38 -07:00
Richard Newman
a74a2deffc
Introduce RelResult rather than Vec<Vec<TypedValue>>. (#639) r=nalexander
* 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.
2018-04-24 15:04:00 -07:00
Richard Newman
1509d16c3e
Fix (the ?foo) (#633) r=nalexander
Don't group by ?var when processing (the ?var).

This PR also finishes error generation in the projector.
2018-04-10 11:58:58 -07:00
Richard Newman
909b2a8be5 Refactoring: split up the projector crate. No other code changes. 2018-04-09 10:26:09 -07:00
Richard Newman
16a66517e4
Err, don't panic, on unbound variable (#518) (#590) r=emily
* Pre: switch a 'panic' to an 'unreachable'.
* Make candidate_type_column fallible. (#518)
2018-03-15 11:39:24 -07:00
Richard Newman
833ff92436
Simple aggregates. (#584) r=emily
* Pre: use debugcli in VSCode.
* Pre: wrap subqueries in parentheses in output SQL.
* Pre: add ExistingColumn.

This lets us make reference to columns by name, rather than only
pointing to qualified aliases.

* Pre: add Into for &str to TypedValue.
* Pre: add Store.transact.
* Pre: cleanup.
* Parse and algebrize simple aggregates. (#312)
* Follow-up: print aggregate columns more neatly in the CLI.
* Useful ValueTypeSet helpers.
* Allow for entity inequalities.
* Add 'differ', which is a ref-specialized not-equals.
* Add 'unpermute', a function for getting unique, distinct pairs from bindings.
* Review comments.
* Add 'the' pseudo-aggregation operator.

This allows for a corresponding value to be returned when a query
includes one 'min' or 'max' aggregate.
2018-03-12 15:18:50 -07:00
Richard Newman
f42ae35b70 Update cache on write. (#566) r=emily
* Use the cache to make constant queries super fast.
* Fix translate tests to match: we no longer generate SQL for many of them!
* Accumulate additions and removals into the cache.
    * Make attribute cache clone-on-write; store it in Metadata.
    * Allow caching of fulltext attributes, interning strings.
2018-03-06 09:01:20 -08:00
Richard Newman
5e50d2a9b4 Update to rusqlite 0.13. 2018-02-22 11:41:57 -08:00
Richard Newman
2ac7a1b1de Add a feature flag to control the use of rusqlite's bundled SQLite. r=emily
You can use this in conjunction with setting SQLITE3_LIB_DIR to control which SQLite is used.

See https://github.com/jgallagher/rusqlite for more.

Also add recent contributors to the authors array.
2018-02-13 08:25:58 -08:00
Richard Newman
66e6fef75e Define Store, use TabWriter in the CLI for aligning columnar output. (#540) r=emily
* Define Store, which is a simple container for a SQLite connection and a Conn.
  This is a breaking change.
* Return the FindSpec as part of QueryOutput, not just results.
* Switch to using stderr in appropriate places in CLI.
* Print columns in CLI output.
2018-02-01 09:29:07 -08:00
Richard Newman
95e95d735e
Correct an assert relating Datalog projection and SQL column counts. (#519) r=tcsc
* Correct an assert relating Datalog projection and SQL column counts. (#517)
* Fix a comment that shouldn't be a doc comment.
2018-01-17 16:36:15 -06:00
Richard Newman
a3b8fd3022 Add results type unwrapping helpers. 2017-12-06 14:47:29 -08:00
Richard Newman
95b9c7f7f5
Atomic multi-tx (#489). r=emily,nalexander
* Pre: rename begin_transaction to begin_tx_application.

* Take an EXCLUSIVE transaction when bootstrapping, and an IMMEDIATE transaction when writing.

This avoids the remote possibility of another write sneaking in the door
while we're preparing to write, avoids us needing to upgrade locks, etc.

  After a BEGIN IMMEDIATE, no other database connection will be able to write
  to the database or do a BEGIN IMMEDIATE or BEGIN EXCLUSIVE. Other processes
  can continue to read from the database, however.

  An exclusive transaction causes EXCLUSIVE locks to be acquired on all
  databases. After a BEGIN EXCLUSIVE, no other database connection except for
  read_uncommitted connections will be able to read the database and no other
  connection without exception will be able to write the database until the
  transaction is complete.

* Hacky implementation of atomic multi-tx.

* Hold the last report, returning the InProgress from each operation.

* Rewrite transact in terms of InProgress.

* Test rollback.

* Remove unused imports.

* Don't use Rc for transaction reports.

* Pre: break out USER0 as a part boundary constant.

* Export TX0 and USER0 from mentat_db. This is for testing.

* Review comments: commenting.

* Test tempid allocation and rollback.
2017-12-05 07:58:24 -08:00
Richard Newman
df90c366af
Partial work from simple aggregates work (#497) r=nalexander
* Pre: make FindQuery, FindSpec, and Element non-Clone.
* Pre: make query translator return a Result.
* Pre: make projection return a Result.
* Pre: refactor query parser in preparation for parsing aggregates.
* Pre: rename PredicateFn -> QueryFunction.
* Pre: expose more about bound variables from CC.
* Pre: move ValueTypeSet to core.
2017-11-30 15:02:07 -08:00
Richard Newman
c600152d78
Update some dependencies. (#492) r=etoop
* Update some dependencies.

* Update rusqlite to 0.12.

* Update error-chain to a forked version that implements Sync.

* Fix some compiler warnings.

* Remove unused imports in tests.

* Parse errors no longer naturally print with the expected symbol.
2017-11-21 16:24:08 +00:00
Nick Alexander
d04d22a6a6 Part 2: refactor projector to be reusable from translator.
This allows the translator to also use bound values in nested queries.
2017-06-09 20:16:39 -07:00
Nick Alexander
2f38f1e73e Pre: Make it easier to debug binding errors. 2017-06-09 20:16:37 -07:00
Richard Newman
523d5ea5f1 Bump dependency versions. r=bgrins. (#441) 2017-05-03 12:53:16 -07:00
Richard Newman
bc63744aba Add :limit to queries (#420) r=nalexander
* Pre: put query parts in alphabetical order.
* Pre: rename 'input' to 'query' in translate tests.
* Part 1: parse :limit.
* Part 2: validate and escape variable parameters in SQL.
* Part 3: algebrize and translate limits.
2017-04-19 16:16:19 -07:00
Nick Alexander
ff0147e89c Review comments: downgrade to error-chain 0.8.1 for Send + Sync bound; use combine::primitive::Error. 2017-04-18 13:19:50 -07:00
Richard Newman
64acc6a7ee Support :with (#311) (#414) r=nalexander
* 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!
2017-04-17 09:23:55 -07:00
Richard Newman
bca8b7e322 Part 4: correct projection of type tags in the outermost projector. 2017-04-12 19:21:56 -07:00
Richard Newman
08d2c613a4 Part 2: expand the definition of a table to include computed tables.
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>.
2017-04-12 19:21:33 -07:00
Richard Newman
a5023c70cb Use Rc for TypedValue, Variable, and query Ident keywords. (#395) r=nalexander
Part 1, core: use Rc for String and Keyword.
Part 2, query: use Rc for Variable.
Part 3, sql: use Rc for args in SQLiteQueryBuilder.
Part 4, query-algebrizer: use Rc.
Part 5, db: use Rc.
Part 6, query-parser: use Rc.
Part 7, query-projector: use Rc.
Part 8, query-translator: use Rc.
Part 9, top level: use Rc.
Part 10: intern Ident and IdentOrKeyword.
2017-04-02 21:38:36 -07:00
Richard Newman
88df7b3b33 Correctly generate DISTINCT and LIMIT. (#386) r=nalexander 2017-03-22 14:02:00 -07:00
Richard Newman
7024978517 Track ever-shrinking sets of types for variables, not a single type. (#381) r=nalexander 2017-03-22 11:30:16 -07:00
Emily Toop
fddc57d548 Use sqlite3_limit instead of hard-coded SQLITE_MAX_VARIABLE_NUMBER (#371) (#288) r=rnewman
* Part 1: added limits feature to rusqlite dependencies.
* Part 2: replace references to SQLITE_MAX_VARIABLE_NUMBER with sqlite3_limit.
* Move assertion check for correct number of variables in repeat_values to before call as this is where the variable is defined.
* Part 3: add tests
2017-03-13 09:39:19 -07:00
Richard Newman
6109a63249 Support input bindings in ConjoiningClauses. r=nalexander 2017-03-10 19:01:56 -08:00
Richard Newman
30804e033a Use rusqlite 0.10.1. (#367) r=nalexander 2017-03-09 12:30:36 -08:00
Richard Newman
bf38105fef (#362) Part 4: handle unknown attributes by expanding type codes. r=nalexander
Also, don't run any SQL at all if an algebrized query is known to return no results.
2017-03-08 17:44:27 -08:00
Richard Newman
7bcf311db9 Pre: move SQLValueType to core, because it's so central.
Yes, this isn't tidy... but in order to be really tidy we'd need to
split up db into parts that don't depend on a particular SQLite library.
2017-03-08 17:41:49 -08:00
Richard Newman
70b112801c Implement projection and querying. (#353) r=nalexander
* Add a failing test for EDN parsing '…'.
* Expose a SQLValueType trait to get value_type_tag values out of a ValueType.
* Add accessors to FindSpec.
* Implement querying.
* Implement rudimentary projection.
* Export mentat_db::new_connection.
* Export symbols from mentat.
* Add rudimentary end-to-end query tests.
2017-03-06 14:40:10 -08:00