rubenada commented on a change in pull request #2027:
URL: https://github.com/apache/calcite/pull/2027#discussion_r440911347
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File path: core/src/main/java/org/apache/calcite/util/graph/Graphs.java
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@@ -56,42 +54,40 @@ public int size() {
public static <V, E extends DefaultEdge> FrozenGraph<V, E> makeImmutable(
DirectedGraph<V, E> graph) {
DefaultDirectedGraph<V, E> graph1 = (DefaultDirectedGraph<V, E>) graph;
- Map<Pair<V, V>, List<V>> shortestPaths = new HashMap<>();
+ Map<Pair<V, V>, int[]> shortestDistances = new HashMap<>();
for (DefaultDirectedGraph.VertexInfo<V, E> arc
: graph1.vertexMap.values()) {
for (E edge : arc.outEdges) {
final V source = graph1.source(edge);
final V target = graph1.target(edge);
- shortestPaths.put(Pair.of(source, target),
- ImmutableList.of(source, target));
+ shortestDistances.put(Pair.of(source, target), new int[] {1});
}
}
while (true) {
// Take a copy of the map's keys to avoid
// ConcurrentModificationExceptions.
final List<Pair<V, V>> previous =
- ImmutableList.copyOf(shortestPaths.keySet());
- int changeCount = 0;
+ ImmutableList.copyOf(shortestDistances.keySet());
+ boolean changeCount = false;
Review comment:
minor thing: now that this variable is a `boolean`, maybe it should be
renamed (`changeCount` -> `change` ?)
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