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ForeachAcceptanceTest.scala
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ForeachAcceptanceTest.scala
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.internal.cypher.acceptance
import org.neo4j.cypher.{ExecutionEngineFunSuite, QueryStatisticsTestSupport, SyntaxException}
import org.neo4j.internal.cypher.acceptance.CypherComparisonSupport._
class ForeachAcceptanceTest extends ExecutionEngineFunSuite with CypherComparisonSupport with QueryStatisticsTestSupport {
test("should understand symbols introduced by FOREACH") {
createLabeledNode("Label")
createLabeledNode("Label")
createLabeledNode("Label2")
val query =
"""MATCH (a:Label)
|WITH collect(a) as nodes
|MATCH (b:Label2)
|FOREACH(n in nodes |
| CREATE (n)-[:SELF]->(b))""".stripMargin
// should work
executeOfficial(query)
}
test("nested foreach") {
// given
createLabeledNode("Root")
// when
val query =
"""MATCH (r:Root)
|FOREACH (i IN range(1, 10) |
| CREATE (r)-[:PARENT]->(c:Child { id:i })
| FOREACH (j IN range(1, 10) |
| CREATE (c)-[:PARENT]->(:Child { id: c.id * 10 + j })
| )
|)""".stripMargin
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, nodesCreated = 110, relationshipsCreated = 110, propertiesWritten = 110, labelsAdded = 110)
val rows = executeScalar[Number]("MATCH (:Root)-[:PARENT]->(:Child) RETURN count(*)")
rows should equal(10)
val ids = executeWith(Configs.Interpreted, "MATCH (:Root)-[:PARENT*]->(c:Child) RETURN c.id AS id ORDER BY c.id").toList
ids should equal((1 to 110).map(i => Map("id" -> i)))
}
test("foreach should return no results") {
// given
val query = "FOREACH( n in range( 0, 1 ) | CREATE (p:Person) )"
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query,
planComparisonStrategy = ComparePlansWithAssertion(plan => {
//THEN
plan should useOperators("Foreach", "Create")
}, Configs.AllRulePlanners + Configs.Version3_1))
// then
assertStats(result, nodesCreated = 2, labelsAdded = 2)
result shouldBe empty
}
test("foreach should not expose inner variables") {
val query =
"""MATCH (n)
|FOREACH (i IN [0, 1, 2]
| CREATE (m)
|)
|SET m.prop = 0
""".stripMargin
a[SyntaxException] should be thrownBy executeWith(Configs.Empty, query)
}
test("foreach should let you use inner variables from create relationship patterns") {
// given
val query =
"""FOREACH (x in [1] |
|CREATE (e:Event)-[i:IN]->(p:Place)
|SET e.foo='e_bar'
|SET i.foo='i_bar'
|SET p.foo='p_bar')
|WITH 0 as dummy
|MATCH (e:Event)-[i:IN]->(p:Place)
|RETURN e.foo, i.foo, p.foo""".stripMargin
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, nodesCreated = 2, relationshipsCreated = 1, labelsAdded = 2, propertiesWritten = 3)
val resultList = result.toList
resultList.head.get("e.foo") should equal(Some("e_bar"))
resultList.head.get("i.foo") should equal(Some("i_bar"))
resultList.head.get("p.foo") should equal(Some("p_bar"))
}
test("Foreach and delete should work together without breaking on unknown identifier types") {
// given
val node = createLabeledNode("Label")
relate(node, createNode())
val query =
"""MATCH (n: Label)
|OPTIONAL MATCH (n)-[rel]->()
|FOREACH (r IN CASE WHEN rel IS NOT NULL THEN [rel] ELSE [] END | DELETE r )""".stripMargin
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, relationshipsDeleted = 1)
}
test("merge inside foreach in compatibility mode should work nicely") {
// given
val query =
"""|FOREACH(v IN [1] |
| CREATE (a), (b)
| MERGE (a)-[:FOO]->(b))""".stripMargin
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, nodesCreated = 2, relationshipsCreated = 1)
}
test("foreach with non-trivially typed collection and create pattern should not create bound node") {
// given
val query =
"""CREATE (a),(b)
|WITH a, collect(b) as nodes, true as condition
|FOREACH (x IN CASE WHEN condition THEN nodes ELSE [] END | CREATE (a)-[:X]->(x) );""".stripMargin
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, nodesCreated = 2, relationshipsCreated = 1)
}
test("foreach with non-trivially typed collection and merge pattern should not create bound node") {
// given
createLabeledNode("Foo")
createLabeledNode("Bar")
val query =
"""MATCH (n:Foo),(m:Bar)
|FOREACH (x IN CASE WHEN true THEN [n] ELSE [] END |
| MERGE (x)-[:FOOBAR]->(m) );""".stripMargin
// when
val result = executeWith(Configs.Interpreted - Configs.Cost2_3, query)
// then
assertStats(result, relationshipsCreated = 1)
}
test("foreach with mixed type collection should not plan create of bound node and fail at runtime") {
// given
createLabeledNode("Foo")
createLabeledNode("Bar")
val query =
"""MATCH (n:Foo),(m:Bar)
|WITH n, [m, 42] as mixedTypeCollection
|FOREACH (x IN mixedTypeCollection | CREATE (n)-[:FOOBAR]->(x) );""".stripMargin
// when
val explain = executeWith(Configs.Interpreted - Configs.Version2_3, s"EXPLAIN $query")
// then
explain.executionPlanDescription().toString shouldNot include("CreateNode")
// when
val config = TestConfiguration(Versions.Default, Planners.Default, Runtimes(Runtimes.Interpreted, Runtimes.Slotted, Runtimes.ProcedureOrSchema)) +
TestConfiguration(Versions(Versions.V3_1, Versions.V3_4), Planners.Cost, Runtimes.Default)
failWithError(config, query, List("Expected to find a node at"))
}
/*
There is a bug in slot-allocation of FOREACH which slots this from executing under slotted. Please adjust
the test once that is fixed.
*/
test("foreach with inner function invocation should work ") {
// given
val foo = createLabeledNode("Foo")
val bar = createLabeledNode("Bar")
relate(foo, bar)
// when
val query =
"""MATCH p = (begin)-[*]->(end)
|FOREACH (n IN nodes(p) | SET n.marked = true)""".stripMargin
val result = executeWith(Configs.CommunityInterpreted - Configs.Cost2_3, query)
// then
assertStats(result, propertiesWritten = 2)
}
}