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arangodb/tests/js/server/aql/aql-subquery.js

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JavaScript

/*jshint globalstrict:false, strict:false, maxlen: 500 */
/*global AQL_EXPLAIN */
////////////////////////////////////////////////////////////////////////////////
/// @brief tests for Ahuacatl, subqueries
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2012 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Jan Steemann
/// @author Copyright 2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////
var jsunity = require("jsunity");
const { assertEqual, assertTrue } = jsunity.jsUnity.assertions;
var helper = require("@arangodb/aql-helper");
var getQueryResults = helper.getQueryResults;
var findExecutionNodes = helper.findExecutionNodes;
const { db } = require("@arangodb");
const isCoordinator = require('@arangodb/cluster').isCoordinator();
////////////////////////////////////////////////////////////////////////////////
/// @brief test suite
////////////////////////////////////////////////////////////////////////////////
function ahuacatlSubqueryTestSuite () {
return {
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryReference1 : function () {
var expected = [ [ [ 1 ], [ 1 ] ] ];
var actual = getQueryResults("LET a = (RETURN 1) LET b = a RETURN [ a, b ]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryReference2 : function () {
var expected = [ [ [ 1 ], [ 1 ], [ 1 ] ] ];
var actual = getQueryResults("LET a = (RETURN 1) LET b = a LET c = b RETURN [ a, b, c ]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryReference3 : function () {
var expected = [ [ [ 1 ], [ 1 ], [ 1 ] ] ];
var actual = getQueryResults("LET a = (RETURN 1) LET b = a LET c = a RETURN [ a, b, c ]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryReferences1 : function () {
var expected = [ [ 1 ] ];
var actual = getQueryResults("LET a = true ? (RETURN 1) : (RETURN 0) RETURN a");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryReferences2 : function () {
var expected = [ [ 1 ] ];
var actual = getQueryResults("LET a = true ? (RETURN 1) : (RETURN 0) LET b = a RETURN b");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryDependent1 : function () {
var expected = [ 2, 4, 6 ];
var actual = getQueryResults("FOR i IN [ 1, 2, 3 ] LET s = (FOR j IN [ 1, 2, 3 ] RETURN i * 2) RETURN s[i - 1]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryDependent2 : function () {
var expected = [ 2, 4, 6 ];
var actual = getQueryResults("FOR i IN [ 1, 2, 3 ] LET t = (FOR k IN [ 1, 2, 3 ] RETURN k) LET s = (FOR j IN [ 1, 2, 3 ] RETURN t[i - 1] * 2) RETURN s[i - 1]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery evaluation
////////////////////////////////////////////////////////////////////////////////
testSubqueryDependent3 : function () {
var expected = [ 4, 5, 6, 8, 10, 12, 12, 15, 18 ];
var actual = getQueryResults("FOR i IN [ 1, 2, 3 ] FOR j IN [ 4, 5, 6 ] LET s = (FOR k IN [ 1 ] RETURN i * j) RETURN s[0]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery optimization
////////////////////////////////////////////////////////////////////////////////
testSubqueryIndependent1 : function () {
var expected = [ 9, 8, 7 ];
var actual = getQueryResults("FOR i IN [ 1, 2, 3 ] LET s = (FOR j IN [ 9, 8, 7 ] RETURN j) RETURN s[i - 1]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery optimization
////////////////////////////////////////////////////////////////////////////////
testSubqueryIndependent2 : function () {
var expected = [ [ 9, 8, 7 ] ];
var actual = getQueryResults("LET s = (FOR j IN [ 9, 8, 7 ] RETURN j) RETURN s");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery optimization
////////////////////////////////////////////////////////////////////////////////
testSubqueryIndependent3 : function () {
var expected = [ [ 25 ], [ 25 ], [ 25 ], [ 25 ], [ 25 ], [ 25 ], [ 25 ], [ 25 ], [ 25 ] ];
var actual = getQueryResults("FOR i IN [ 1, 2, 3 ] FOR j IN [ 1, 2, 3 ] LET s = (FOR k IN [ 25 ] RETURN k) RETURN s");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery optimization
////////////////////////////////////////////////////////////////////////////////
testSubqueryIndependent4 : function () {
var expected = [ [ 2, 4, 6 ] ];
var actual = getQueryResults("LET a = (FOR i IN [ 1, 2, 3 ] LET s = (FOR j IN [ 1, 2 ] RETURN j) RETURN i * s[1]) RETURN a");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery optimization
////////////////////////////////////////////////////////////////////////////////
testSubqueryOutVariableName : function () {
const explainResult = AQL_EXPLAIN("FOR u IN _users LET theLetVariable = (FOR j IN _users RETURN j) RETURN theLetVariable",
{}, {optimizer: {rules: ['-splice-subqueries']}});
const subqueryNode = findExecutionNodes(explainResult, "SubqueryNode")[0];
assertEqual(subqueryNode.outVariable.name, "theLetVariable");
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test splice-subqueries optimization
////////////////////////////////////////////////////////////////////////////////
testSpliceSubqueryOutVariableName : function () {
const explainResult = AQL_EXPLAIN("FOR u IN _users LET theLetVariable = (FOR j IN _users RETURN j) RETURN theLetVariable");
const subqueryEndNode = findExecutionNodes(explainResult, "SubqueryEndNode")[0];
assertEqual(subqueryEndNode.outVariable.name, "theLetVariable");
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery as function parameter
////////////////////////////////////////////////////////////////////////////////
testSubqueryAsFunctionParameter1: function () {
var expected = [ [ 1, 2, 3 ] ];
var actual = getQueryResults("RETURN PASSTHRU(FOR i IN [ 1, 2, 3 ] RETURN i)");
assertEqual(expected, actual);
actual = getQueryResults("RETURN PASSTHRU((FOR i IN [ 1, 2, 3 ] RETURN i))");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test subquery as function parameter
////////////////////////////////////////////////////////////////////////////////
testSubqueryAsFunctionParameter2: function () {
var expected = [ 6 ];
var actual = getQueryResults("RETURN MAX(APPEND((FOR i IN [ 1, 2, 3 ] RETURN i), (FOR i IN [ 4, 5, 6 ] RETURN i)))");
assertEqual(expected, actual);
actual = getQueryResults("RETURN MAX(APPEND(FOR i IN [ 1, 2, 3 ] RETURN i, FOR i IN [ 4, 5, 6 ] RETURN i))");
assertEqual(expected, actual);
expected = [ 9 ];
actual = getQueryResults("RETURN MAX(APPEND(FOR i IN [ 9, 7, 8 ] RETURN i, [ 1 ]))");
assertEqual(expected, actual);
expected = [ [ 1, 2, 3, 4, 5, 6 ] ];
actual = getQueryResults("RETURN UNION((FOR i IN [ 1, 2, 3 ] RETURN i), (FOR i IN [ 4, 5, 6 ] RETURN i))");
assertEqual(expected, actual);
actual = getQueryResults("RETURN UNION(FOR i IN [ 1, 2, 3 ] RETURN i, FOR i IN [ 4, 5, 6 ] RETURN i)");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test copying of subquery results
////////////////////////////////////////////////////////////////////////////////
testIndependentSubqueries1: function () {
var expected = [ [ [ ], [ ] ] ];
// use a single block
for (var i = 1; i <= 100; ++i) {
expected[0][0].push(i);
expected[0][1].push(i);
}
var actual = getQueryResults("LET a = (FOR i IN 1..100 RETURN i) LET b = (FOR i IN 1..100 RETURN i) RETURN [a, b]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test copying of subquery results
////////////////////////////////////////////////////////////////////////////////
testIndependentSubqueries2: function () {
var expected = [ [ [ ], [ ] ] ];
// use multiple blocks
for (var i = 1; i <= 10000; ++i) {
expected[0][0].push(i);
expected[0][1].push(i);
}
var actual = getQueryResults("LET a = (FOR i IN 1..10000 RETURN i) LET b = (FOR i IN 1..10000 RETURN i) RETURN [a, b]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test copying of subquery results
////////////////////////////////////////////////////////////////////////////////
testDependentSubqueries1: function () {
var expected = [ [ [ ], [ ] ] ];
for (var i = 1; i <= 100; ++i) {
expected[0][0].push(i);
expected[0][1].push(i);
}
var actual = getQueryResults("LET a = (FOR i IN 1..100 RETURN i) LET b = (FOR i IN 1..100 FILTER i IN a RETURN i) RETURN [a, b]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test copying of subquery results
////////////////////////////////////////////////////////////////////////////////
testDependentSubqueries2: function () {
var expected = [ [ [ ], [ ] ] ];
for (var i = 1; i <= 100; ++i) {
if (i < 50) {
expected[0][0].push(i);
}
else {
expected[0][1].push(i);
}
}
var actual = getQueryResults("LET a = (FOR i IN 1..100 FILTER i < 50 RETURN i) LET b = (FOR i IN 1..100 FILTER i NOT IN a RETURN i) RETURN [a, b]");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test copying of subquery results
////////////////////////////////////////////////////////////////////////////////
testDependentSubqueries3: function () {
var expected = [ ];
for (var i = 1; i <= 2000; ++i) {
expected.push(i);
}
var actual = getQueryResults("LET a = (FOR i IN 1..2000 RETURN i) FOR i IN 1..10000 FILTER i IN a RETURN i");
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief test limit with offset in a subquery
/// This test was introduced due to a bug (that never made it into devel) where
/// the offset in the LimitBlock was mutated during a subquery run and not reset
/// in between.
////////////////////////////////////////////////////////////////////////////////
testSubqueriesWithLimitAndOffset: function () {
const query = `
FOR i IN 2..4
LET a = (FOR j IN [0, i, i+10] LIMIT 1, 1 RETURN j)
RETURN FIRST(a)`;
const expected = [ 2, 3, 4 ];
var actual = getQueryResults(query);
assertEqual(expected, actual);
},
////////////////////////////////////////////////////////////////////////////////
/// @brief this tests a rather complex interna of AQL execution combinations
/// A subquery should only be executed if it has an input row
/// A count collect block will produce an output even if it does not get an input
/// specifically it will rightfully count 0.
/// The insert block will write into the collection if it gets an input.
/// So the assertion here is, that if a subquery has no input, than all it's
/// Parts do not have side-effects, but the subquery still prduces valid results
////////////////////////////////////////////////////////////////////////////////
testCollectWithinEmptyNestedSubquery: function () {
const colName = "UnitTestSubqueryCollection";
try {
db._create(colName);
const query = `
FOR k IN 1..2
LET sub1 = (
FOR x IN []
LET sub2 = (
COLLECT WITH COUNT INTO q
INSERT {counted: q} INTO ${colName}
RETURN NEW
)
RETURN sub2
)
RETURN [k, sub1]
`;
const expected = [ [1, []], [2, []]];
var actual = getQueryResults(query);
assertEqual(expected, actual);
assertEqual(db[colName].count(), 0);
} finally {
db._drop(colName);
}
},
testCollectionAccessSubquery: function () {
const colName = "UnitTestSubqueryCollection";
try {
const col = db._create(colName, {numberOfShards: 9});
let dbServers = 0;
if (isCoordinator) {
dbServers = Object.values(col.shards(true)).filter((value, index, self) => {
return self.indexOf(value) === index;
}).length;
}
const docs = [];
const expected = new Map();
for (let i = 0; i < 2000; ++i) {
docs.push({value: i, mod100: i % 100});
const oldValue = expected.get(i % 100) || [];
oldValue.push(i);
expected.set(i % 100, oldValue);
}
col.save(docs);
// Now we do a left outer join on the same collection
const query = `
FOR left IN ${colName}
LET rightJoin = (
FOR right IN ${colName}
FILTER left.mod100 == right.mod100
RETURN right.value
)
RETURN {key: left.mod100, value: rightJoin}
`;
// First NoIndex variant
{
const cursor = db._query(query);
const actual = cursor.toArray();
const {scannedFull, scannedIndex, filtered, httpRequests} = cursor.getExtra().stats;
assertEqual(scannedFull, 4002000);
assertEqual(scannedIndex, 0);
assertEqual(filtered, 3960000);
if (isCoordinator) {
assertTrue(httpRequests <= 4003 * dbServers + 1, httpRequests);
} else {
assertEqual(httpRequests, 0);
}
const foundKeys = new Map();
for (const {key, value} of actual) {
assertTrue(expected.has(key));
// Use sort here as no ordering is guaranteed by query.
assertEqual(expected.get(key).sort(), value.sort());
foundKeys.set(key, (foundKeys.get(key) || 0) + 1);
}
assertEqual(foundKeys.size, expected.size);
for (const value of foundKeys.values()) {
assertEqual(value, 20);
}
}
// Second with Index
{
col.ensureHashIndex("mod100");
const cursor = db._query(query);
const actual = cursor.toArray();
const {scannedFull, scannedIndex, filtered, httpRequests} = cursor.getExtra().stats;
assertEqual(scannedFull, 2000);
assertEqual(scannedIndex, 40000);
assertEqual(filtered, 0);
if (isCoordinator) {
assertTrue(httpRequests <= 4003 * dbServers + 1, httpRequests);
} else {
assertEqual(httpRequests, 0);
}
const foundKeys = new Map();
for (const {key, value} of actual) {
assertTrue(expected.has(key));
// Use sort here as no ordering is guaranteed by query.
assertEqual(expected.get(key).sort(), value.sort());
foundKeys.set(key, (foundKeys.get(key) || 0) + 1);
}
assertEqual(foundKeys.size, expected.size);
for (const value of foundKeys.values()) {
assertEqual(value, 20);
}
}
} finally {
db._drop(colName);
}
}
};
}
jsunity.run(ahuacatlSubqueryTestSuite);
return jsunity.done();