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.
89 lines
2.6 KiB
Rust
89 lines
2.6 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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extern crate mentat_query_projector;
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use mentat_core::{
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Attribute,
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Entid,
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Schema,
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ValueType,
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};
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use mentat_query_parser::{
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parse_find_string,
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};
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use mentat_query::{
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NamespacedKeyword,
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};
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use mentat_query_algebrizer::{
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Known,
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algebrize,
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};
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use mentat_query_projector::{
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query_projection,
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};
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// These are helpers that tests use to build Schema instances.
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fn associate_ident(schema: &mut Schema, i: NamespacedKeyword, e: Entid) {
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schema.entid_map.insert(e, i.clone());
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schema.ident_map.insert(i.clone(), e);
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}
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fn add_attribute(schema: &mut Schema, e: Entid, a: Attribute) {
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schema.attribute_map.insert(e, a);
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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", "name"), 65);
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associate_ident(&mut schema, NamespacedKeyword::new("foo", "age"), 68);
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associate_ident(&mut schema, NamespacedKeyword::new("foo", "height"), 69);
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add_attribute(&mut schema, 65, Attribute {
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value_type: ValueType::String,
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multival: false,
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..Default::default()
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});
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add_attribute(&mut schema, 68, Attribute {
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value_type: ValueType::Long,
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multival: false,
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..Default::default()
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});
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add_attribute(&mut schema, 69, Attribute {
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value_type: ValueType::Long,
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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_aggregate_unsuitable_type() {
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let schema = prepopulated_schema();
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let query = r#"[:find (avg ?e)
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:where
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[?e :foo/age ?a]]"#;
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// While the query itself algebrizes and parses…
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let parsed = parse_find_string(query).expect("query input to have parsed");
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let algebrized = algebrize(Known::for_schema(&schema), parsed).expect("query algebrizes");
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// … when we look at the projection list, we cannot reconcile the types.
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assert!(query_projection(&algebrized).is_err());
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}
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