820 lines
27 KiB
Rust
820 lines
27 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 regex;
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#[macro_use] 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_sql;
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use std::boxed::Box;
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use mentat_core::{
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Entid,
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SQLTypeAffinity,
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TypedValue,
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ValueType,
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};
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use mentat_query::{
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Direction,
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Limit,
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Variable,
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};
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use mentat_query_algebrizer::{
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Column,
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OrderBy,
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QualifiedAlias,
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QueryValue,
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SourceAlias,
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TableAlias,
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VariableColumn,
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};
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use mentat_sql::{
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BuildQueryResult,
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QueryBuilder,
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QueryFragment,
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SQLError,
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SQLiteQueryBuilder,
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SQLQuery,
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};
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//---------------------------------------------------------
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// A Mentat-focused representation of a SQL query.
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/// One of the things that can appear in a projection or a constraint. Note that we use
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/// `TypedValue` here; it's not pure SQL, but it avoids us having to concern ourselves at this
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/// point with the translation between a `TypedValue` and the storage-layer representation.
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///
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/// Eventually we might allow different translations by providing a different `QueryBuilder`
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/// implementation for each storage backend. Passing `TypedValue`s here allows for that.
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pub enum ColumnOrExpression {
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Column(QualifiedAlias),
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ExistingColumn(Name),
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Entid(Entid), // Because it's so common.
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Integer(i32), // We use these for type codes etc.
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Long(i64),
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Value(TypedValue),
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// Some aggregates (`min`, `max`, `avg`) can be over 0 rows, and therefore can be `NULL`; that
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// needs special treatment.
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NullableAggregate(Box<Expression>, ValueType), // Track the return type.
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Expression(Box<Expression>, ValueType), // Track the return type.
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}
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pub enum Expression {
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Unary { sql_op: &'static str, arg: ColumnOrExpression },
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}
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/// `QueryValue` and `ColumnOrExpression` are almost identical… merge somehow?
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impl From<QueryValue> for ColumnOrExpression {
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fn from(v: QueryValue) -> Self {
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match v {
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QueryValue::Column(c) => ColumnOrExpression::Column(c),
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QueryValue::Entid(e) => ColumnOrExpression::Entid(e),
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QueryValue::PrimitiveLong(v) => ColumnOrExpression::Long(v),
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QueryValue::TypedValue(v) => ColumnOrExpression::Value(v),
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}
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}
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}
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pub type Name = String;
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pub struct ProjectedColumn(pub ColumnOrExpression, pub Name);
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pub enum Projection {
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Columns(Vec<ProjectedColumn>),
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Star,
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One,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum GroupBy {
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ProjectedColumn(Name),
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QueryColumn(QualifiedAlias),
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// TODO: non-projected expressions, etc.
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}
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impl QueryFragment for GroupBy {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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match self {
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&GroupBy::ProjectedColumn(ref name) => {
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out.push_identifier(name.as_str())
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},
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&GroupBy::QueryColumn(ref qa) => {
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qualified_alias_push_sql(out, qa)
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},
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}
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}
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}
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#[derive(Copy, Clone)]
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pub struct Op(pub &'static str); // TODO: we can do better than this!
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pub enum Constraint {
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Infix {
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op: Op,
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left: ColumnOrExpression,
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right: ColumnOrExpression,
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},
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Or {
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constraints: Vec<Constraint>,
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},
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And {
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constraints: Vec<Constraint>,
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},
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In {
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left: ColumnOrExpression,
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list: Vec<ColumnOrExpression>,
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},
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IsNull {
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value: ColumnOrExpression,
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},
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IsNotNull {
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value: ColumnOrExpression,
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},
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NotExists {
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subquery: TableOrSubquery,
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},
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TypeCheck {
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value: ColumnOrExpression,
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affinity: SQLTypeAffinity
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}
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}
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impl Constraint {
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pub fn not_equal(left: ColumnOrExpression, right: ColumnOrExpression) -> Constraint {
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Constraint::Infix {
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op: Op("<>"), // ANSI SQL for future-proofing!
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left: left,
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right: right,
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}
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}
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pub fn equal(left: ColumnOrExpression, right: ColumnOrExpression) -> Constraint {
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Constraint::Infix {
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op: Op("="),
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left: left,
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right: right,
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}
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}
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pub fn fulltext_match(left: ColumnOrExpression, right: ColumnOrExpression) -> Constraint {
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Constraint::Infix {
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op: Op("MATCH"), // SQLite specific!
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left: left,
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right: right,
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}
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}
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}
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#[allow(dead_code)]
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enum JoinOp {
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Inner,
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}
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// Short-hand for a list of tables all inner-joined.
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pub struct TableList(pub Vec<TableOrSubquery>);
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impl TableList {
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fn is_empty(&self) -> bool {
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self.0.is_empty()
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}
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}
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pub struct Join {
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left: TableOrSubquery,
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op: JoinOp,
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right: TableOrSubquery,
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// TODO: constraints (ON, USING).
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}
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#[allow(dead_code)]
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pub enum TableOrSubquery {
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Table(SourceAlias),
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Union(Vec<SelectQuery>, TableAlias),
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Subquery(Box<SelectQuery>),
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Values(Values, TableAlias),
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}
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pub enum Values {
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/// Like "VALUES (0, 1), (2, 3), ...".
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/// The vector must be of a length that is a multiple of the given size.
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Unnamed(usize, Vec<TypedValue>),
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/// Like "SELECT 0 AS x, SELECT 0 AS y WHERE 0 UNION ALL VALUES (0, 1), (2, 3), ...".
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/// The vector of values must be of a length that is a multiple of the length
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/// of the vector of names.
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Named(Vec<Variable>, Vec<TypedValue>),
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}
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pub enum FromClause {
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TableList(TableList), // Short-hand for a pile of inner joins.
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Join(Join),
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Nothing,
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}
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pub struct SelectQuery {
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pub distinct: bool,
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pub projection: Projection,
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pub from: FromClause,
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pub constraints: Vec<Constraint>,
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pub group_by: Vec<GroupBy>,
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pub order: Vec<OrderBy>,
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pub limit: Limit,
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}
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fn push_variable_column(qb: &mut QueryBuilder, vc: &VariableColumn) -> BuildQueryResult {
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match vc {
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&VariableColumn::Variable(ref v) => {
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qb.push_identifier(v.as_str())
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},
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&VariableColumn::VariableTypeTag(ref v) => {
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qb.push_identifier(format!("{}_value_type_tag", v.name()).as_str())
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},
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}
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}
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fn push_column(qb: &mut QueryBuilder, col: &Column) -> BuildQueryResult {
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match col {
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&Column::Fixed(ref d) => {
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qb.push_sql(d.as_str());
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Ok(())
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},
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&Column::Fulltext(ref d) => {
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qb.push_sql(d.as_str());
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Ok(())
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},
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&Column::Variable(ref vc) => push_variable_column(qb, vc),
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&Column::Transactions(ref d) => {
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qb.push_sql(d.as_str());
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Ok(())
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},
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}
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}
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//---------------------------------------------------------
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// Turn that representation into SQL.
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impl QueryFragment for ColumnOrExpression {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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use self::ColumnOrExpression::*;
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match self {
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&Column(ref qa) => {
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qualified_alias_push_sql(out, qa)
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},
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&ExistingColumn(ref alias) => {
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out.push_identifier(alias.as_str())
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},
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&Entid(entid) => {
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out.push_sql(entid.to_string().as_str());
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Ok(())
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},
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&Integer(integer) => {
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out.push_sql(integer.to_string().as_str());
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Ok(())
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},
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&Long(long) => {
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out.push_sql(long.to_string().as_str());
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Ok(())
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},
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&Value(ref v) => {
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out.push_typed_value(v)
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},
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&NullableAggregate(ref e, _) |
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&Expression(ref e, _) => {
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e.push_sql(out)
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},
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}
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}
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}
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impl QueryFragment for Expression {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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match self {
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&Expression::Unary { ref sql_op, ref arg } => {
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out.push_sql(sql_op); // No need to escape built-ins.
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out.push_sql("(");
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arg.push_sql(out)?;
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out.push_sql(")");
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Ok(())
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},
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}
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}
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}
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impl QueryFragment for Projection {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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use self::Projection::*;
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match self {
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&One => out.push_sql("1"),
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&Star => out.push_sql("*"),
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&Columns(ref cols) => {
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let &ProjectedColumn(ref col, ref alias) = &cols[0];
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col.push_sql(out)?;
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out.push_sql(" AS ");
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out.push_identifier(alias.as_str())?;
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for &ProjectedColumn(ref col, ref alias) in &cols[1..] {
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out.push_sql(", ");
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col.push_sql(out)?;
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out.push_sql(" AS ");
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out.push_identifier(alias.as_str())?;
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}
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},
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};
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Ok(())
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}
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}
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impl QueryFragment for Op {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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// No escaping needed.
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out.push_sql(self.0);
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Ok(())
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}
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}
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impl QueryFragment for Constraint {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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use self::Constraint::*;
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match self {
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&Infix { ref op, ref left, ref right } => {
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left.push_sql(out)?;
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out.push_sql(" ");
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op.push_sql(out)?;
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out.push_sql(" ");
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right.push_sql(out)
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},
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&IsNull { ref value } => {
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value.push_sql(out)?;
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out.push_sql(" IS NULL");
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Ok(())
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},
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&IsNotNull { ref value } => {
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value.push_sql(out)?;
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out.push_sql(" IS NOT NULL");
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Ok(())
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},
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&And { ref constraints } => {
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// An empty intersection is true.
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if constraints.is_empty() {
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out.push_sql("1");
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return Ok(())
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}
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out.push_sql("(");
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interpose!(constraint, constraints,
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{ constraint.push_sql(out)? },
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{ out.push_sql(" AND ") });
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out.push_sql(")");
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Ok(())
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},
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&Or { ref constraints } => {
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// An empty alternation is false.
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if constraints.is_empty() {
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out.push_sql("0");
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return Ok(())
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}
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out.push_sql("(");
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interpose!(constraint, constraints,
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{ constraint.push_sql(out)? },
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{ out.push_sql(" OR ") });
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out.push_sql(")");
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Ok(())
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}
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&In { ref left, ref list } => {
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left.push_sql(out)?;
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out.push_sql(" IN (");
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interpose!(item, list,
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{ item.push_sql(out)? },
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{ out.push_sql(", ") });
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out.push_sql(")");
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Ok(())
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},
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&NotExists { ref subquery } => {
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out.push_sql("NOT EXISTS ");
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subquery.push_sql(out)
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},
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&TypeCheck { ref value, ref affinity } => {
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out.push_sql("typeof(");
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value.push_sql(out)?;
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out.push_sql(") = ");
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out.push_sql(match *affinity {
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SQLTypeAffinity::Null => "'null'",
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SQLTypeAffinity::Integer => "'integer'",
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SQLTypeAffinity::Real => "'real'",
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SQLTypeAffinity::Text => "'text'",
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SQLTypeAffinity::Blob => "'blob'",
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});
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Ok(())
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},
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}
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}
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}
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impl QueryFragment for JoinOp {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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out.push_sql(" JOIN ");
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Ok(())
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}
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}
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// We don't own QualifiedAlias or QueryFragment, so we can't implement the trait.
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fn qualified_alias_push_sql(out: &mut QueryBuilder, qa: &QualifiedAlias) -> BuildQueryResult {
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out.push_identifier(qa.0.as_str())?;
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out.push_sql(".");
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push_column(out, &qa.1)
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}
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// We don't own SourceAlias or QueryFragment, so we can't implement the trait.
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fn source_alias_push_sql(out: &mut QueryBuilder, sa: &SourceAlias) -> BuildQueryResult {
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let &SourceAlias(ref table, ref alias) = sa;
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out.push_identifier(table.name())?;
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out.push_sql(" AS ");
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out.push_identifier(alias.as_str())
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}
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impl QueryFragment for TableList {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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if self.0.is_empty() {
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return Ok(());
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}
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interpose!(t, self.0,
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{ t.push_sql(out)? },
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{ out.push_sql(", ") });
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Ok(())
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}
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}
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impl QueryFragment for Join {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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self.left.push_sql(out)?;
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self.op.push_sql(out)?;
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self.right.push_sql(out)
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}
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}
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impl QueryFragment for TableOrSubquery {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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use self::TableOrSubquery::*;
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match self {
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&Table(ref sa) => source_alias_push_sql(out, sa),
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&Union(ref subqueries, ref table_alias) => {
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out.push_sql("(");
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interpose!(subquery, subqueries,
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{ subquery.push_sql(out)? },
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{ out.push_sql(" UNION ") });
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out.push_sql(") AS ");
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out.push_identifier(table_alias.as_str())
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},
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&Subquery(ref subquery) => {
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out.push_sql("(");
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subquery.push_sql(out)?;
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out.push_sql(")");
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Ok(())
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},
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&Values(ref values, ref table_alias) => {
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// XXX: does this work for Values::Unnamed?
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out.push_sql("(");
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values.push_sql(out)?;
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out.push_sql(") AS ");
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out.push_identifier(table_alias.as_str())
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},
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}
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}
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}
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impl QueryFragment for Values {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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// There are at least 3 ways to name the columns of a VALUES table:
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// 1) the columns are named "", ":1", ":2", ... -- but this is undocumented. See
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// http://stackoverflow.com/a/40921724.
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// 2) A CTE ("WITH" statement) can declare the shape of the table, like "WITH
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// table_name(column_name, ...) AS (VALUES ...)".
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// 3) We can "UNION ALL" a dummy "SELECT" statement in place.
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//
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// We don't want to use an undocumented SQLite quirk, and we're a little concerned that some
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// SQL systems will not optimize WITH statements well. It's also convenient to have an in
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// place table to query, so for now we implement option 3.
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if let &Values::Named(ref names, _) = self {
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out.push_sql("SELECT ");
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interpose!(alias, names,
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{ out.push_sql("0 AS ");
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out.push_identifier(alias.as_str())? },
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{ out.push_sql(", ") });
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out.push_sql(" WHERE 0 UNION ALL ");
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}
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let values = match self {
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&Values::Named(ref names, ref values) => values.chunks(names.len()),
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&Values::Unnamed(ref size, ref values) => values.chunks(*size),
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};
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out.push_sql("VALUES ");
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interpose_iter!(outer, values,
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{ out.push_sql("(");
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interpose!(inner, outer,
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{ out.push_typed_value(inner)? },
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{ out.push_sql(", ") });
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out.push_sql(")");
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},
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{ out.push_sql(", ") });
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Ok(())
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}
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}
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impl QueryFragment for FromClause {
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fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
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use self::FromClause::*;
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match self {
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&TableList(ref table_list) => {
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if table_list.is_empty() {
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Ok(())
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} else {
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out.push_sql(" FROM ");
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table_list.push_sql(out)
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}
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},
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|
&Join(ref join) => {
|
|
out.push_sql(" FROM ");
|
|
join.push_sql(out)
|
|
},
|
|
&Nothing => Ok(()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl SelectQuery {
|
|
fn push_variable_param(&self, var: &Variable, out: &mut QueryBuilder) -> BuildQueryResult {
|
|
// `var` is something like `?foo99-people`.
|
|
// Trim the `?` and escape the rest. Prepend `i` to distinguish from
|
|
// the inline value space `v`.
|
|
let re = regex::Regex::new("[^a-zA-Z_0-9]").unwrap();
|
|
let without_question = var.as_str().split_at(1).1;
|
|
let replaced = re.replace_all(without_question, "_");
|
|
let bind_param = format!("i{}", replaced); // We _could_ avoid this copying.
|
|
out.push_bind_param(bind_param.as_str())
|
|
}
|
|
}
|
|
|
|
impl QueryFragment for SelectQuery {
|
|
fn push_sql(&self, out: &mut QueryBuilder) -> BuildQueryResult {
|
|
if self.distinct {
|
|
out.push_sql("SELECT DISTINCT ");
|
|
} else {
|
|
out.push_sql("SELECT ");
|
|
}
|
|
self.projection.push_sql(out)?;
|
|
self.from.push_sql(out)?;
|
|
|
|
if !self.constraints.is_empty() {
|
|
out.push_sql(" WHERE ");
|
|
interpose!(constraint, self.constraints,
|
|
{ constraint.push_sql(out)? },
|
|
{ out.push_sql(" AND ") });
|
|
}
|
|
|
|
match &self.group_by {
|
|
group_by if !group_by.is_empty() => {
|
|
out.push_sql(" GROUP BY ");
|
|
interpose!(group, group_by,
|
|
{ group.push_sql(out)? },
|
|
{ out.push_sql(", ") });
|
|
},
|
|
_ => {},
|
|
}
|
|
|
|
if !self.order.is_empty() {
|
|
out.push_sql(" ORDER BY ");
|
|
interpose!(&OrderBy(ref dir, ref var), self.order,
|
|
{ push_variable_column(out, var)?;
|
|
match dir {
|
|
&Direction::Ascending => { out.push_sql(" ASC"); },
|
|
&Direction::Descending => { out.push_sql(" DESC"); },
|
|
};
|
|
},
|
|
{ out.push_sql(", ") });
|
|
}
|
|
|
|
match &self.limit {
|
|
&Limit::None => (),
|
|
&Limit::Fixed(limit) => {
|
|
// Guaranteed to be non-negative: u64.
|
|
out.push_sql(" LIMIT ");
|
|
out.push_sql(limit.to_string().as_str());
|
|
},
|
|
&Limit::Variable(ref var) => {
|
|
// Guess this wasn't bound yet. Produce an argument.
|
|
out.push_sql(" LIMIT ");
|
|
self.push_variable_param(var, out)?;
|
|
},
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl SelectQuery {
|
|
pub fn to_sql_query(&self) -> Result<SQLQuery, SQLError> {
|
|
let mut builder = SQLiteQueryBuilder::new();
|
|
self.push_sql(&mut builder).map(|_| builder.finish())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use std::rc::Rc;
|
|
|
|
use mentat_query_algebrizer::{
|
|
Column,
|
|
DatomsColumn,
|
|
DatomsTable,
|
|
FulltextColumn,
|
|
};
|
|
|
|
fn build_query(c: &QueryFragment) -> SQLQuery {
|
|
let mut builder = SQLiteQueryBuilder::new();
|
|
c.push_sql(&mut builder)
|
|
.map(|_| builder.finish())
|
|
.expect("to produce a query for the given constraint")
|
|
}
|
|
|
|
fn build(c: &QueryFragment) -> String {
|
|
build_query(c).sql
|
|
}
|
|
|
|
#[test]
|
|
fn test_in_constraint() {
|
|
let none = Constraint::In {
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new("datoms01".to_string(), Column::Fixed(DatomsColumn::Value))),
|
|
list: vec![],
|
|
};
|
|
|
|
let one = Constraint::In {
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new("datoms01".to_string(), DatomsColumn::Value)),
|
|
list: vec![
|
|
ColumnOrExpression::Entid(123),
|
|
],
|
|
};
|
|
|
|
let three = Constraint::In {
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new("datoms01".to_string(), DatomsColumn::Value)),
|
|
list: vec![
|
|
ColumnOrExpression::Entid(123),
|
|
ColumnOrExpression::Entid(456),
|
|
ColumnOrExpression::Entid(789),
|
|
],
|
|
};
|
|
|
|
assert_eq!("`datoms01`.v IN ()", build(&none));
|
|
assert_eq!("`datoms01`.v IN (123)", build(&one));
|
|
assert_eq!("`datoms01`.v IN (123, 456, 789)", build(&three));
|
|
}
|
|
|
|
#[test]
|
|
fn test_and_constraint() {
|
|
let c = Constraint::And {
|
|
constraints: vec![
|
|
Constraint::And {
|
|
constraints: vec![
|
|
Constraint::Infix {
|
|
op: Op("="),
|
|
left: ColumnOrExpression::Entid(123),
|
|
right: ColumnOrExpression::Entid(456),
|
|
},
|
|
Constraint::Infix {
|
|
op: Op("="),
|
|
left: ColumnOrExpression::Entid(789),
|
|
right: ColumnOrExpression::Entid(246),
|
|
},
|
|
],
|
|
},
|
|
],
|
|
};
|
|
|
|
// Two sets of parens: the outermost AND only has one child,
|
|
// but still contributes parens.
|
|
assert_eq!("((123 = 456 AND 789 = 246))", build(&c));
|
|
}
|
|
|
|
#[test]
|
|
fn test_unnamed_values() {
|
|
let build = |len, values| build(&Values::Unnamed(len, values));
|
|
|
|
assert_eq!(build(1, vec![TypedValue::Long(1)]),
|
|
"VALUES (1)");
|
|
|
|
assert_eq!(build(2, vec![TypedValue::Boolean(false), TypedValue::Long(1)]),
|
|
"VALUES (0, 1)");
|
|
|
|
assert_eq!(build(2, vec![TypedValue::Boolean(false), TypedValue::Long(1),
|
|
TypedValue::Boolean(true), TypedValue::Long(2)]),
|
|
"VALUES (0, 1), (1, 2)");
|
|
}
|
|
|
|
#[test]
|
|
fn test_named_values() {
|
|
let build = |names: Vec<_>, values| build(&Values::Named(names.into_iter().map(Variable::from_valid_name).collect(), values));
|
|
assert_eq!(build(vec!["?a"], vec![TypedValue::Long(1)]),
|
|
"SELECT 0 AS `?a` WHERE 0 UNION ALL VALUES (1)");
|
|
|
|
assert_eq!(build(vec!["?a", "?b"], vec![TypedValue::Boolean(false), TypedValue::Long(1)]),
|
|
"SELECT 0 AS `?a`, 0 AS `?b` WHERE 0 UNION ALL VALUES (0, 1)");
|
|
|
|
assert_eq!(build(vec!["?a", "?b"],
|
|
vec![TypedValue::Boolean(false), TypedValue::Long(1),
|
|
TypedValue::Boolean(true), TypedValue::Long(2)]),
|
|
"SELECT 0 AS `?a`, 0 AS `?b` WHERE 0 UNION ALL VALUES (0, 1), (1, 2)");
|
|
}
|
|
|
|
#[test]
|
|
fn test_matches_constraint() {
|
|
let c = Constraint::Infix {
|
|
op: Op("MATCHES"),
|
|
left: ColumnOrExpression::Column(QualifiedAlias("fulltext01".to_string(), Column::Fulltext(FulltextColumn::Text))),
|
|
right: ColumnOrExpression::Value("needle".into()),
|
|
};
|
|
let q = build_query(&c);
|
|
assert_eq!("`fulltext01`.text MATCHES $v0", q.sql);
|
|
assert_eq!(vec![("$v0".to_string(), Rc::new(mentat_sql::Value::Text("needle".to_string())))], q.args);
|
|
|
|
let c = Constraint::Infix {
|
|
op: Op("="),
|
|
left: ColumnOrExpression::Column(QualifiedAlias("fulltext01".to_string(), Column::Fulltext(FulltextColumn::Rowid))),
|
|
right: ColumnOrExpression::Column(QualifiedAlias("datoms02".to_string(), Column::Fixed(DatomsColumn::Value))),
|
|
};
|
|
assert_eq!("`fulltext01`.rowid = `datoms02`.v", build(&c));
|
|
}
|
|
|
|
#[test]
|
|
fn test_end_to_end() {
|
|
// [:find ?x :where [?x 65537 ?v] [?x 65536 ?v]]
|
|
let datoms00 = "datoms00".to_string();
|
|
let datoms01 = "datoms01".to_string();
|
|
let eq = Op("=");
|
|
let source_aliases = vec![
|
|
TableOrSubquery::Table(SourceAlias(DatomsTable::Datoms, datoms00.clone())),
|
|
TableOrSubquery::Table(SourceAlias(DatomsTable::Datoms, datoms01.clone())),
|
|
];
|
|
|
|
let mut query = SelectQuery {
|
|
distinct: true,
|
|
projection: Projection::Columns(
|
|
vec![
|
|
ProjectedColumn(
|
|
ColumnOrExpression::Column(QualifiedAlias::new(datoms00.clone(), DatomsColumn::Entity)),
|
|
"x".to_string()),
|
|
]),
|
|
from: FromClause::TableList(TableList(source_aliases)),
|
|
constraints: vec![
|
|
Constraint::Infix {
|
|
op: eq.clone(),
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new(datoms01.clone(), DatomsColumn::Value)),
|
|
right: ColumnOrExpression::Column(QualifiedAlias::new(datoms00.clone(), DatomsColumn::Value)),
|
|
},
|
|
Constraint::Infix {
|
|
op: eq.clone(),
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new(datoms00.clone(), DatomsColumn::Attribute)),
|
|
right: ColumnOrExpression::Entid(65537),
|
|
},
|
|
Constraint::Infix {
|
|
op: eq.clone(),
|
|
left: ColumnOrExpression::Column(QualifiedAlias::new(datoms01.clone(), DatomsColumn::Attribute)),
|
|
right: ColumnOrExpression::Entid(65536),
|
|
},
|
|
],
|
|
group_by: vec![],
|
|
order: vec![],
|
|
limit: Limit::None,
|
|
};
|
|
|
|
let SQLQuery { sql, args } = query.to_sql_query().unwrap();
|
|
println!("{}", sql);
|
|
assert_eq!("SELECT DISTINCT `datoms00`.e AS `x` FROM `datoms` AS `datoms00`, `datoms` AS `datoms01` WHERE `datoms01`.v = `datoms00`.v AND `datoms00`.a = 65537 AND `datoms01`.a = 65536", sql);
|
|
assert!(args.is_empty());
|
|
|
|
// And without distinct…
|
|
query.distinct = false;
|
|
let SQLQuery { sql, args } = query.to_sql_query().unwrap();
|
|
println!("{}", sql);
|
|
assert_eq!("SELECT `datoms00`.e AS `x` FROM `datoms` AS `datoms00`, `datoms` AS `datoms01` WHERE `datoms01`.v = `datoms00`.v AND `datoms00`.a = 65537 AND `datoms01`.a = 65536", sql);
|
|
assert!(args.is_empty());
|
|
|
|
}
|
|
}
|