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TraversalMatcherBuilder now accepts queries with node id start points…
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…, and ignores optional patterns
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@systay
systay committed Sep 20, 2012
1 parent 1563a00 commit 3f4a689
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Showing 6 changed files with 48 additions and 50 deletions.
7 changes: 4 additions & 3 deletions ...r/src/main/scala/org/neo4j/cypher/internal/executionplan/builders/IndexQueryBuilder.scala
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Expand Up @@ -21,13 +21,12 @@ package org.neo4j.cypher.internal.executionplan.builders

import org.neo4j.cypher.internal.commands._
import org.neo4j.cypher.internal.pipes.{ExecutionContext, RelationshipStartPipe, NodeStartPipe, Pipe}
import org.neo4j.graphdb.{PropertyContainer, Relationship, Node, GraphDatabaseService}
import org.neo4j.graphdb.{Relationship, Node, GraphDatabaseService}
import collection.JavaConverters._
import java.lang.{Iterable => JIterable}
import org.neo4j.cypher.MissingIndexException
import org.neo4j.cypher.internal.executionplan.{ExecutionPlanInProgress, PlanBuilder}
import collection.Iterable

import GetGraphElements.getElements

class IndexQueryBuilder(graph: GraphDatabaseService) extends PlanBuilder {
def apply(plan: ExecutionPlanInProgress) = {
Expand Down Expand Up @@ -92,6 +91,8 @@ object IndexQueryBuilder {
val r = indexHits.asScala.toList
r
}

case NodeById(varName, ids) => m => GetGraphElements.getElements[Node](ids(m), varName, graph.getNodeById)
}

def getRelationshipGetter(startItem: StartItem, graph: GraphDatabaseService): ExecutionContext => Iterable[Relationship] =
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6 changes: 5 additions & 1 deletion cypher/src/main/scala/org/neo4j/cypher/internal/executionplan/builders/TrailBuilder.scala
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Expand Up @@ -84,7 +84,11 @@ final class TrailBuilder(patterns: Seq[RelatedTo], boundPoints: Seq[String], pre
val start = longestPath.start
val end = if (boundPoints.contains(longestPath.end)) Some(longestPath.end) else None

Some(LongestTrail(start, end, remainingPattern, longestPath))

if (longestPath.size < 2)
None
else
Some(LongestTrail(start, end, remainingPattern, longestPath))
}
}

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5 changes: 3 additions & 2 deletions ...main/scala/org/neo4j/cypher/internal/executionplan/builders/TraversalMatcherBuilder.scala
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Expand Up @@ -81,12 +81,13 @@ class TraversalMatcherBuilder(graph: GraphDatabaseService) extends PlanBuilder {
val startPoints = plan.query.start.flatMap {
case Unsolved(NodeByIndexQuery(id, _, _)) => Some(id)
case Unsolved(NodeByIndex(id, _, _, _)) => Some(id)
case Unsolved(NodeById(id, _)) => Some(id)
case _ => None
}

val pattern = plan.query.patterns.flatMap {
case Unsolved(r: RelatedTo) => Some(r)
case _ => None
case Unsolved(r: RelatedTo) if !r.optional => Some(r)
case _ => None
}

val preds = plan.query.where.filter(_.unsolved).map(_.token)
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13 changes: 7 additions & 6 deletions cypher/src/main/scala/org/neo4j/cypher/internal/pipes/TraversalMatchPipe.scala
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Expand Up @@ -27,13 +27,14 @@ import org.neo4j.cypher.internal.executionplan.builders.Trail
class TraversalMatchPipe(source: Pipe, matcher:TraversalMatcher, trail:Trail) extends PipeWithSource(source) {
def createResults(state: QueryState) =
source.createResults(state).flatMap {
context => val paths = matcher.findMatchingPaths(state, context)
context =>
val paths = matcher.findMatchingPaths(state, context)

paths.map {
path => val seq = path.iterator().asScala.toSeq
val m = trail.decompose(seq)
context.newWith(m)
}
paths.map {
path => val seq = path.iterator().asScala.toSeq
val m = trail.decompose(seq)
context.newWith(m)
}
}

def symbols = trail.symbols(source.symbols)
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6 changes: 4 additions & 2 deletions cypher/src/test/scala/org/neo4j/cypher/ExecutionEngineTest.scala
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Expand Up @@ -2020,8 +2020,10 @@ RETURN x0.name?
val b = createNode()
val r = relate(a, b)

val result = parseAndExecute("START a=node(1), b=node(2) match a-->b RETURN a-[*]->b").toList
assert(result === List(Map("a-[*]->b" -> List(PathImpl(a, r, b)))))
val result = parseAndExecute("START a=node(1), b=node(2) match a-->b RETURN*")

println(result.dumpToString())
// assert(result === List(Map("a-[*]->b" -> List(PathImpl(a, r, b)))))
}

@Test
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61 changes: 25 additions & 36 deletions cypher/src/test/scala/org/neo4j/cypher/internal/pipes/matching/ExpanderStepTest.scala
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Expand Up @@ -22,8 +22,8 @@ package org.neo4j.cypher.internal.pipes.matching
import org.junit.Test
import org.neo4j.graphdb.{RelationshipType, DynamicRelationshipType, Direction}
import org.scalatest.Assertions
import org.neo4j.cypher.internal.commands.{True, Predicate}
import org.neo4j.cypher.internal.commands.expressions.Expression
import org.neo4j.cypher.internal.commands.{Equals, True, Predicate}
import org.neo4j.cypher.internal.commands.expressions.{Literal, Property, Expression}
import org.neo4j.cypher.internal.symbols.SymbolTable
import collection.Map
import org.neo4j.kernel.impl.core.NodeManager
Expand Down Expand Up @@ -66,58 +66,47 @@ class ExpanderStepTest extends Assertions {


@Test def reverse_two_steps() {
/*
(a)-[pr1:A]->(b)-[pr2:B]->(c)
WHERE pr1.prop = 1 AND b.prop = 2 AND pr2.prop = 3
//()-[pr1:A]->(a)-[pr2:B]->()
//WHERE r1.prop = 42 AND r2.prop = "FOO"

val step2 = step(0, A, Direction.INCOMING, None, "pr1", "b")
val step1 = step(1, B, Direction.INCOMING, Some(step2), "pr2")

val forward2 = step(0, Seq(A), Direction.INCOMING, None, nodePredicate = nodePred)
val forward1 = step(1, Seq(B), Direction.INCOMING, Some(forward2))
*/

val step2 = step(0, B, Direction.OUTGOING, None, "pr2")
val step1 = step(1, A, Direction.OUTGOING, Some(step2), "pr1", "b")

val step1R = step(1, A, Direction.INCOMING, None, "pr1")
val step2R = step(0, B, Direction.INCOMING, Some(step1R), "pr2", "b")
val step1R = step(1, B, Direction.OUTGOING, None, "pr2", "b")
val step2R = step(0, A, Direction.OUTGOING, Some(step1R), "pr1")

assert(step1.reverse() === step2R)
assert(step2R.reverse() === step1)
}

@Test def reverse_with_predicates() {
/*
(a)-[r1:A]->(b)-[r2:B]->(c)-[r3:C]->(d)
WHERE r1.prop = 1 AND b.prop = 2 AND r2.prop = 3 AND c.prop=4 AND r3.prop=5
*/
val step3 = step(0, C, Direction.OUTGOING, None, "pr3")
val step2 = step(1, B, Direction.OUTGOING, Some(step3), "pr2", "c")
val step1 = step(2, A, Direction.OUTGOING, Some(step2), "pr1", "b")
@Test def reverse_with_three_steps() {
//()-[pr1:A]->(a)-[pr2:B]->(b)-[pr3:C]->()
//WHERE r1.prop = 42 AND r2.prop = "FOO"

val step1R = step(2, A, Direction.INCOMING, None, "pr1")
val step2R = step(1, B, Direction.INCOMING, Some(step1R), "pr2", "b")
val step3R = step(0, C, Direction.INCOMING, Some(step2R), "pr3", "c")
val step3 = step(0, A, Direction.INCOMING, None, "pr1", "b")
val step2 = step(1, B, Direction.INCOMING, Some(step3), "pr2", "c")
val step1 = step(2, C, Direction.INCOMING, Some(step2), "pr3")

val step1R = step(2, C, Direction.OUTGOING, None, "pr3", "c")
val step2R = step(1, B, Direction.OUTGOING, Some(step1R), "pr2", "b")
val step3R = step(0, A, Direction.OUTGOING, Some(step2R), "pr1")

assert(step1.reverse() === step3R)
assert(step3R.reverse() === step1)

}

@Test def reverse_predicates_with_mixed_directions() {
/*
(a)-[r1:A]->(b)<-[r2:B]-(c)-[r3:C]->(d)
WHERE r1.prop = 1 AND b.prop = 2 AND r2.prop = 3 AND c.prop=4 AND r3.prop=5
*/
val step3 = step(0, C, Direction.BOTH, None, "pr3")
//()-[pr1:A]->(a)-[pr2:B]->(b)-[pr3:C]->()
//WHERE r1.prop = 42 AND r2.prop = "FOO"

val step3 = step(0, A, Direction.BOTH, None, "pr1", "b")
val step2 = step(1, B, Direction.INCOMING, Some(step3), "pr2", "c")
val step1 = step(2, A, Direction.OUTGOING, Some(step2), "pr1", "b")
val step1 = step(2, C, Direction.OUTGOING, Some(step2), "pr3")

val step1R = step(2, A, Direction.INCOMING, None, "pr1")
val step1R = step(2, C, Direction.INCOMING, None, "pr3", "c")
val step2R = step(1, B, Direction.OUTGOING, Some(step1R), "pr2", "b")
val step3R = step(0, C, Direction.BOTH, Some(step2R), "pr3", "c")

val step3R = step(0, A, Direction.BOTH, Some(step2R), "pr1")

assert(step1.reverse() === step3R)
assert(step3R.reverse() === step1)
Expand Down

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