833ff92436
* 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.
118 lines
3.8 KiB
Rust
118 lines
3.8 KiB
Rust
// Copyright 2016 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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extern crate mentat_core;
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extern crate mentat_query;
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extern crate mentat_query_algebrizer;
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extern crate mentat_query_parser;
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mod utils;
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use mentat_core::{
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Attribute,
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Schema,
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ValueType,
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ValueTypeSet,
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};
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use mentat_query::{
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NamespacedKeyword,
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PlainSymbol,
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Variable,
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};
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use mentat_query_algebrizer::{
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EmptyBecause,
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ErrorKind,
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Known,
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};
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use utils::{
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add_attribute,
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alg,
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associate_ident,
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bails,
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};
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fn prepopulated_schema() -> Schema {
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let mut schema = Schema::default();
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associate_ident(&mut schema, NamespacedKeyword::new("foo", "date"), 65);
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associate_ident(&mut schema, NamespacedKeyword::new("foo", "double"), 66);
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add_attribute(&mut schema, 65, Attribute {
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value_type: ValueType::Instant,
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multival: false,
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..Default::default()
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});
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add_attribute(&mut schema, 66, Attribute {
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value_type: ValueType::Double,
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multival: false,
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..Default::default()
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});
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schema
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}
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#[test]
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fn test_instant_predicates_require_instants() {
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let schema = prepopulated_schema();
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let known = Known::for_schema(&schema);
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// You can't use a string for an inequality: this is a straight-up error.
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let query = r#"[:find ?e
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:where
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[?e :foo/date ?t]
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[(> ?t "2017-06-16T00:56:41.257Z")]]"#;
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match bails(known, query).0 {
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ErrorKind::InvalidArgumentType(op, why, idx) => {
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assert_eq!(op, PlainSymbol::new(">"));
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assert_eq!(why, ValueTypeSet::of_numeric_and_instant_types());
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assert_eq!(idx, 1);
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},
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_ => panic!("Expected InvalidArgument."),
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}
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let query = r#"[:find ?e
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:where
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[?e :foo/date ?t]
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[(> "2017-06-16T00:56:41.257Z", ?t)]]"#;
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match bails(known, query).0 {
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ErrorKind::InvalidArgumentType(op, why, idx) => {
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assert_eq!(op, PlainSymbol::new(">"));
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assert_eq!(why, ValueTypeSet::of_numeric_and_instant_types());
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assert_eq!(idx, 0); // We get this right.
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},
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_ => panic!("Expected InvalidArgument."),
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}
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// You can try using a number, which is valid input to a numeric predicate.
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// In this store and query, though, that means we expect `?t` to be both
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// an instant and a number, so the query is known-empty.
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let query = r#"[:find ?e
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:where
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[?e :foo/date ?t]
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[(> ?t 1234512345)]]"#;
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let cc = alg(known, query);
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assert!(cc.is_known_empty());
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assert_eq!(cc.empty_because.unwrap(),
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EmptyBecause::TypeMismatch {
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var: Variable::from_valid_name("?t"),
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existing: ValueTypeSet::of_one(ValueType::Instant),
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desired: ValueTypeSet::of_numeric_types(),
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});
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// You can compare doubles to longs.
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let query = r#"[:find ?e
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:where
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[?e :foo/double ?t]
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[(< ?t 1234512345)]]"#;
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let cc = alg(known, query);
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assert!(!cc.is_known_empty());
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assert_eq!(cc.known_type(&Variable::from_valid_name("?t")).expect("?t is known"),
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ValueType::Double);
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}
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