msgui commented on code in PR #2242:
URL:
https://github.com/apache/incubator-hugegraph/pull/2242#discussion_r1261969141
##########
hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/EdgeExistenceTraverser.java:
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@@ -0,0 +1,48 @@
+package org.apache.hugegraph.traversal.algorithm;
+
+import org.apache.hugegraph.HugeGraph;
+import org.apache.hugegraph.backend.id.Id;
+import org.apache.hugegraph.backend.query.ConditionQuery;
+import org.apache.hugegraph.type.HugeType;
+import org.apache.hugegraph.type.define.Directions;
+import org.apache.hugegraph.type.define.HugeKeys;
+import org.apache.tinkerpop.gremlin.structure.Edge;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public class EdgeExistenceTraverser extends HugeTraverser {
+ public EdgeExistenceTraverser(HugeGraph graph) {
+ super(graph);
+ }
+
+ public Iterator<Edge> queryEdgeExistence(
+ Id sourceId, Id targetId,
+ String label, long limit) {
+ if ("BOTH".equals(label)) {
+ return queryByNeighbor(sourceId, targetId, limit);
+ }
+ ConditionQuery conditionQuery = new ConditionQuery(HugeType.EDGE);
+ conditionQuery.eq(HugeKeys.OWNER_VERTEX, sourceId);
+ conditionQuery.eq(HugeKeys.OTHER_VERTEX, targetId);
+ conditionQuery.eq(HugeKeys.LABEL, getEdgeLabelId(label));
+ conditionQuery.eq(HugeKeys.DIRECTION, Directions.OUT);
+ conditionQuery.eq(HugeKeys.SORT_VALUES, "");
Review Comment:
> please check if exists sortkey in the edge label, fallback if yes
How exactly is the fallback implemented? I'm not quite sure which aspects of
ConditionQuery can utilize EdgeLabel.sortkeys.
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