bitflicker64 commented on code in PR #2994:
URL: https://github.com/apache/hugegraph/pull/2994#discussion_r4115027607
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hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/optimize/TraversalUtil.java:
##########
@@ -645,14 +673,548 @@ private static boolean
extractHasContainers(HugeVertexStep<?> newStep,
private static boolean canExtractHasContainers(HugeGraph graph,
HasContainerHolder holder) {
- for (HasContainer has : holder.getHasContainers()) {
+ // Keep unsafe labels and their sibling properties for local filtering.
+ if (hasUnsafeLabelPredicate(holder)) {
+ return false;
+ }
+ List<HasContainer> hasContainers = holder.getHasContainers();
+ for (HasContainer has : hasContainers) {
if (!canExtractHasContainer(graph, has)) {
return false;
}
}
return true;
}
+ private static void prepareLocalHasContainers(
+ Step<?, ?> source, Traversal.Admin<?, ?> traversal) {
+ QueryHolder query = (QueryHolder) source;
+ Step<?, ?> step = source.getNextStep();
+ while (step instanceof HasStep || step instanceof NoOpBarrierStep) {
+ Step<?, ?> next = step.getNextStep();
+ if (step instanceof HasStep) {
+ HasContainerHolder holder = (HasContainerHolder) step;
+ for (HasContainer has : new
ArrayList<>(holder.getHasContainers())) {
+ // Paging is query metadata, never an element property
filter.
+ if (QueryHolder.SYSPROP_PAGE.equals(has.getKey())) {
+ query.addHasContainer(has);
+ holder.removeHasContainer(has);
+ continue;
+ }
+ if (T.id.getAccessor().equals(has.getKey())) {
+ // ID lookup is complete across labels. Existing source
+ // IDs and unsupported predicates still filter locally.
+ if (source instanceof HugeGraphStep &&
+ GraphStep.processHasContainerIds((HugeGraphStep<?,
?>) source, has)) {
+ holder.removeHasContainer(has);
+ continue;
+ }
+ holder.removeHasContainer(has);
+ holder.addHasContainer(new
LocalIdHasContainer(has.getPredicate()));
+ continue;
+ }
+ if (T.label.getAccessor().equals(has.getKey())) {
+ holder.removeHasContainer(has);
+ HasContainer label = new
LocalLabelHasContainer(has.getPredicate());
+ if (source instanceof HugeGraphStep &&
+ canPushPositiveLabel((HugeGraphStep<?, ?>) source,
has)) {
+ // A positive label conjunct uses the label index,
+ // independent of per-label property index
coverage.
+ // Keep the runtime label matcher for source-ID
queries.
+ query.addHasContainer(label);
+ } else {
+ // Keep unsupported candidates and adjacent-vertex
+ // labels local, including their paging boundary.
+ holder.addHasContainer(label);
+ }
+ continue;
+ }
+ if (keyForContainsKey(has.getKey()) ||
keyForContainsValue(has.getKey())) {
+ // Backend CONTAINS support varies and source IDs use
+ // local filtering too. Preserve HugeGraph's map query
+ // semantics without treating "key"/"value" as names.
+ holder.removeHasContainer(has);
+ traversal.addStep(traversal.getSteps().indexOf(step),
+ new LocalContainsStep<>(traversal,
has));
+ continue;
+ }
+ List<P<Object>> predicates = new ArrayList<>();
+ collectPredicates(predicates,
ImmutableList.of(has.getPredicate()));
+ if (predicates.stream().anyMatch(p ->
+ p.getBiPredicate() ==
Condition.RelationType.TEXT_CONTAINS)) {
+ // Child traversals can be unbound during optimization;
+ // the matcher resolves the graph from each runtime
element.
+ holder.removeHasContainer(has);
+ holder.addHasContainer(new LocalSearchHasContainer(
+ has.getKey(), has.getPredicate()));
+ }
+ }
+ if (holder.getHasContainers().isEmpty()) {
+ TraversalHelper.copyLabels(step, step.getPreviousStep(),
false);
+ traversal.removeStep(step);
+ }
+ }
+ step = next;
+ }
+ if (query.queryInfo().paging() && step instanceof RangeGlobalStep) {
+ // Bound the raw backend page even when local filters prevent
normal
+ // range extraction. Keep the range step to apply offset/limit
after
+ // those filters; a filtered page may contain fewer results.
+ query.setRange(0, ((RangeGlobalStep<?>) step).getHighRange());
+ }
+ }
+
+ private static boolean canPushPositiveLabel(HugeGraphStep<?, ?> source,
+ HasContainer has) {
+ if (!isEqInLabelPredicate(has)) {
+ return false;
+ }
+ HugeGraph graph = tryGetGraph(source);
+ if (graph == null) {
+ return false;
+ }
+ List<P<Object>> predicates = new ArrayList<>();
+ collectPredicates(predicates, ImmutableList.of(has.getPredicate()));
+ for (P<Object> predicate : predicates) {
+ Object value = predicate.getValue();
+ BiPredicate<?, ?> bp = predicate.getBiPredicate();
+ if (bp == Contains.within && !(value instanceof Collection)) {
+ return false;
+ }
+ Collection<?> values = bp == Contains.within ?
+ (Collection<?>) value :
Collections.singletonList(value);
+ for (Object candidate : values) {
+ if (!hasLabelIndex(graph, source.returnsVertex(), candidate)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ private static boolean hasLabelIndex(HugeGraph graph, boolean vertex,
Object value) {
+ if (value instanceof Number) {
+ value = IdGenerator.of(((Number) value).longValue());
+ }
+ try {
+ SchemaLabel label;
+ if (value instanceof Id) {
+ Id id = (Id) value;
+ // Nonpositive IDs include internal schema objects that aren't
+ // user labels. Preserve their local matching behavior.
+ if (!id.number() || id.asLong() <= 0L) {
+ return false;
+ }
+ label = vertex ? graph.vertexLabel(id) : graph.edgeLabel(id);
+ } else if (value instanceof String) {
+ label = vertex ? graph.vertexLabel((String) value) :
graph.edgeLabel((String) value);
+ } else {
+ return false;
+ }
+ // Do not turn a working local filter into a missing-label/index
error.
+ return label != null && label.enableLabelIndex();
+ } catch (IllegalArgumentException | NotFoundException e) {
+ return false;
+ }
+ }
+
+ private static P<?> localIdPredicate(P<?> predicate) {
+ // Keep IDs local to preserve source-ID intersections and step
ordering.
+ // UUID/Element values need the same representation as
HugeElement.id(). Leave
+ // strings unchanged so HasContainer retains its string-ID comparison.
+ P<?> copy = predicate.clone();
+ List<P<Object>> leaves = new ArrayList<>();
+ collectPredicates(leaves, ImmutableList.of(copy));
+ for (P<Object> leaf : leaves) {
+ Object value = leaf.getValue();
+ if (value instanceof Collection) {
+ List<Object> values = new ArrayList<>();
+ for (Object item : (Collection<?>) value) {
+ values.add(localIdValue(item));
+ }
+ leaf.setValue(values);
+ } else {
+ leaf.setValue(localIdValue(value));
+ }
+ }
+ return copy;
+ }
+
+ private static Object localIdValue(Object value) {
+ if (value instanceof UUID || value instanceof Element) {
+ return HugeElement.getIdValue(HugeType.VERTEX, value);
+ }
+ return value;
+ }
+
+ private static final class LocalIdHasContainer extends HasContainer {
+
+ private static final long serialVersionUID = 1L;
+
+ private LocalIdHasContainer(P<?> predicate) {
+ super(T.id.getAccessor(), localIdPredicate(predicate));
+ }
+
+ @Override
+ protected boolean testId(Element element) {
+ return testLocalIdPredicate(this.getPredicate(), element.id());
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ private static boolean testLocalIdPredicate(P<?> predicate, Object id) {
+ if (predicate instanceof ConnectiveP) {
+ boolean and = predicate instanceof AndP;
+ for (P<?> child : ((ConnectiveP<?>) predicate).getPredicates()) {
+ if (testLocalIdPredicate(child, id) != and) {
+ return !and;
+ }
+ }
+ return and;
+ }
+ Object value = predicate.getValue();
+ Object first = value;
+ if (value instanceof Collection) {
+ Collection<?> values = (Collection<?>) value;
+ first = values.isEmpty() ? null : values.iterator().next();
+ }
+ // HasContainer decides string-ID comparison from only the top-level
+ // P value. ConnectiveP has no such value; decide separately per leaf.
+ Object actual = first instanceof String ? id.toString() : id;
+ return ((BiPredicate<Object, Object>)
predicate.getBiPredicate()).test(actual, value);
+ }
+
+ private static final class LocalLabelHasContainer extends HasContainer {
+
+ private static final long serialVersionUID = 1L;
+
+ private LocalLabelHasContainer(P<?> predicate) {
+ super(T.label.getAccessor(), predicate.clone());
+ }
+
+ @Override
+ protected boolean testLabel(Element element) {
+ // Resolve against the actual element, not a graph captured while
+ // strategies run. Child traversals may be unbound or later cloned.
+ return testLabelPredicate(this.getPredicate(), ((HugeElement)
element).schemaLabel());
+ }
+ }
+
+ private static final class LocalContainsStep<S extends Element> extends
HasStep<S> {
+
+ private static final long serialVersionUID = 1L;
+
+ private LocalContainsStep(Traversal.Admin<?, ?> traversal,
HasContainer has) {
+ super(traversal, has.clone());
+ E.checkArgument(has.getPredicate().getBiPredicate() == Compare.eq,
+ "CONTAINS query with relation '%s' is not
supported",
+ has.getPredicate().getBiPredicate());
+ }
+
+ @Override
+ protected boolean filter(Traverser.Admin<S> traverser) {
+ HugeElement element = (HugeElement) traverser.get();
+ // Adjacent vertices can be ID/label-only shells. Like
properties(),
+ // load their properties before evaluating the system property map.
+ element.getFilledProperties();
+ // Keep a HasStep boundary so count/range cannot bypass this
filter.
+ // Resolve schema from the runtime element; clone/reset must not
+ // retain a graph or transaction captured during optimization.
+ for (HasContainer has : this.getHasContainers()) {
+ boolean matches = keyForContainsKey(has.getKey()) ||
keyForContainsValue(has.getKey()) ?
+ convContains2Relation(element.graph(),
has).test(element) :
+ has.test(element);
+ if (!matches) {
+ return false;
+ }
+ }
+ return true;
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ private static boolean testLabelPredicate(P<?> predicate, SchemaLabel
label) {
+ if (predicate instanceof ConnectiveP) {
+ boolean and = predicate instanceof AndP;
+ for (P<?> child : ((ConnectiveP<?>) predicate).getPredicates()) {
+ if (testLabelPredicate(child, label) != and) {
+ return !and;
+ }
+ }
+ return and;
+ }
+ BiPredicate<?, ?> bp = predicate.getBiPredicate();
+ Object value = predicate.getValue();
+ if (bp == Contains.within || bp == Contains.without) {
+ for (Object item : (Collection<?>) value) {
+ if (testLabelValue(Compare.eq, label, item)) {
+ return bp == Contains.within;
+ }
+ }
+ return bp == Contains.without;
+ }
+ return testLabelValue((BiPredicate<Object, Object>) bp, label, value);
+ }
+
+ private static boolean testLabelValue(BiPredicate<Object, Object>
predicate,
+ SchemaLabel label, Object value) {
+ if (value instanceof Number) {
+ value = IdGenerator.of(((Number) value).longValue());
+ }
+ return predicate.test(value instanceof Id ? label.id() : label.name(),
value);
+ }
+
+ private static final class LocalSearchHasContainer extends HasContainer {
+
+ private static final long serialVersionUID = 1L;
+
+ private transient HugeGraph matcherGraph;
+ private transient P<?> matcherPredicate;
+ private transient Predicate<Object> matcher;
+
+ private LocalSearchHasContainer(String key, P<?> predicate) {
+ super(key, predicate.clone());
+ }
+
+ @Override
+ protected boolean testValue(Property property) {
+ // Keep the public P tree intact for strategies, hashing and Java
+ // serialization. Resolve the analyzer from the element's graph,
+ // including after cloning, deserialization or graph rebinding.
+ HugeGraph graph = (HugeGraph) property.element().graph();
+ if (this.matcherGraph != graph ||
+ !samePredicateValues(this.getPredicate(),
this.matcherPredicate)) {
+ P<?> predicate = this.getPredicate().clone();
+ this.matcher = localSearchMatcher(predicate, graph);
+ this.matcherPredicate = predicate;
+ this.matcherGraph = graph;
+ }
+ return this.matcher.test(property.value());
+ }
+
+ @Override
+ public LocalSearchHasContainer clone() {
+ LocalSearchHasContainer clone = (LocalSearchHasContainer)
super.clone();
+ clone.matcherGraph = null;
+ clone.matcherPredicate = null;
+ clone.matcher = null;
+ return clone;
+ }
+ }
+
+ private static boolean samePredicateValues(P<?> current, P<?> cached) {
+ // P.equals() compares originalValue, not the value changed by
setValue().
+ if (cached == null || current.getClass() != cached.getClass()) {
+ return false;
+ }
+ if (current instanceof ConnectiveP) {
+ List<? extends P<?>> children = ((ConnectiveP<?>)
current).getPredicates();
+ List<? extends P<?>> oldChildren = ((ConnectiveP<?>)
cached).getPredicates();
+ if (children.size() != oldChildren.size()) {
+ return false;
+ }
+ for (int i = 0; i < children.size(); i++) {
+ if (!samePredicateValues(children.get(i), oldChildren.get(i)))
{
+ return false;
+ }
+ }
+ return true;
+ }
+ return current.getBiPredicate().equals(cached.getBiPredicate()) &&
+ Objects.equals(current.getValue(), cached.getValue());
+ }
+
+ @SuppressWarnings("unchecked")
+ private static Predicate<Object> localSearchMatcher(P<?> predicate,
HugeGraph graph) {
+ if (predicate instanceof ConnectiveP) {
+ List<Predicate<Object>> children = new ArrayList<>();
+ for (P<?> child : ((ConnectiveP<?>) predicate).getPredicates()) {
+ children.add(localSearchMatcher(child, graph));
+ }
+ boolean and = predicate instanceof AndP;
+ return value -> {
+ for (Predicate<Object> child : children) {
+ if (child.test(value) != and) {
+ return !and;
+ }
+ }
+ return and;
+ };
+ }
+ if (predicate.getBiPredicate() !=
Condition.RelationType.TEXT_CONTAINS) {
+ return (P<Object>) predicate;
+ }
+ // Match SEARCH terms in place, preserving range and side-effect
ordering.
+ return graph.searchPredicate((String) predicate.getValue());
+ }
+
+ private static boolean hasUnsafeLabelInTraversal(
+ Traversal.Admin<?, ?> traversal, Step<?, ?> sourceStep) {
+ // Partial pushdown can lose candidates before local label filtering.
+ // Scan the remaining traversal, its children and each ancestor's
+ // remaining steps for filters on child output. Arbitrary extension
+ // steps don't reliably expose element identity, so stay conservative.
+ // FIXME(#3201): Restore selective pushdown when every candidate
schema label
+ // has compatible index coverage for extracted property predicates.
+ // Outside proven root and child suffixes, negative labels can disable
+ // property pushdown even across element changes (including ancestors
+ // and unknown extension steps), potentially requiring a full scan.
+ List<Step> steps = traversal.getSteps();
+ int start = 0;
+ while (start < steps.size() && steps.get(start) != sourceStep) {
+ start++;
+ }
+ start++;
+ for (int i = start; i < steps.size(); i++) {
+ Step<?, ?> step = steps.get(i);
+ if (changesCurrentElement(step) &&
+ traversal.getParent() instanceof EmptyStep &&
+ onlyCurrentElementSuffix(steps.subList(i, steps.size()))) {
+ return false;
+ }
+ if (step instanceof HasStep) {
+ HasContainerHolder holder = (HasContainerHolder) step;
+ if (hasUnsafeLabelPredicate(holder)) {
+ return true;
+ }
+ }
+ if (hasUnsafeLabelInChildren(step)) {
+ return true;
+ }
+ }
+ TraversalParent parent = traversal.getParent();
+ if (parent instanceof Step && !(parent instanceof EmptyStep)) {
+ Step<?, ?> parentStep = (Step<?, ?>) parent;
+ // RepeatStep's until/emit siblings can filter this child's output.
+ // This helper only descends, so revisiting the owning step's
children
+ // cannot recurse back into this ancestor walk.
+ if (hasUnsafeLabelInChildren(parentStep)) {
+ return true;
+ }
+ return hasUnsafeLabelInTraversal(parentStep.getTraversal(),
parentStep);
+ }
+ return false;
+ }
+
+ private static boolean changesCurrentElement(Step<?, ?> step) {
+ // Vertex adjacency is a scope boundary for this label fallback, not
+ // proof that a self-loop or later hop cannot return the source.
+ // Preserve the source property query's existing index/error semantics;
+ // complete cross-label property candidates are tracked in #3201.
+ // Edge endpoints can recover the source (outE().outV(), inE().inV(),
+ // bothV()). Do not admit EdgeVertexStep here or in the suffix
allowlist:
+ // checking only that step is too late if outE() already ended the
scan.
+ return step instanceof VertexStep || step instanceof PropertiesStep;
+ }
+
+ private static boolean onlyCurrentElementSuffix(List<Step> steps) {
+ for (Step<?, ?> step : steps) {
+ // An allowlist is deliberate: select/path, lambdas, repeat and
+ // extension steps may recover earlier elements. Never infer their
+ // provenance from the output type alone.
+ if (!(changesCurrentElement(step) || step instanceof HasStep ||
Review Comment:
Important: The adjacency boundary restored in 73c2e85 only takes effect when
every later step is on this allowlist, and common trailing steps are missing.
`DedupGlobalStep`, `OrderGlobalStep`, `PropertyMapStep` (`valueMap()`),
`ElementMapStep`, `FoldStep`, `GroupCountStep` and `ProjectStep` all fail the
check, so `hasUnsafeLabelInTraversal()` keeps scanning past `out()`, finds the
negative label, and `prepareLocalHasContainers()` leaves the source property
local.
Evidence, from probes run at 73c2e85 with JDK 11:
- Plan, using the `TraversalUtilOptimizeTest` helpers:
`has("city","Beijing").out().hasLabel(P.neq("author"))` gives
`HugeGraphStep(Vertex,[city.eq(Beijing)])`. Adding `.dedup()`,
`.order().by("name")`, `.valueMap()`, `.elementMap()`, `.fold()`,
`.groupCount()` or `.project("n").by("name")` gives `HugeGraphStep(vertex,[])`
plus a local `HasStep([city.eq(Beijing)])`, which is a full vertex scan.
`.values("name")` keeps the index plan.
- Runtime on the memory backend, using the
`testNegativeLabelAfterAdjacencyPreservesSourceCandidates` data:
`out().hasLabel(P.neq("author")).values("name")` returns `[loop-person]`, while
the same query with `.dedup()` before `values()` returns `[loop-person,
loop-fan]`. `order().by("name")` and `valueMap("name")` also return 2 rows.
- For an unindexed property,
`g.V().has("unindexedP","x").out().hasLabel(P.neq("author"))` throws
`NoIndexException`. Adding `.dedup()` returns 1 row after a scan.
On master 83ef9f3 all of these shapes push `city` into the source query. The
change description says ordinary adjacency keeps the source query's index plan
and missing-index errors, but that only holds when the traversal ends in one of
the listed steps. As it stands, the result set and the error depend on which
terminal step the caller appends.
Requested change: add the steps that keep or project the current traverser
without recovering an earlier element (at least `DedupGlobalStep`,
`OrderGlobalStep`, `PropertyMapStep`, `ElementMapStep`, `FoldStep`,
`GroupCountStep`, `ProjectStep`), and check their `by()` children through the
existing child recursion. Then extend
`testLabelAfterElementChangeKeepsSourceIndexPlan` and
`testNegativeLabelAfterAdjacencyPreservesSourceCandidates` with `.dedup()` and
`.order().by(...)` variants, and extend the `NoIndexException` regression with
a `.dedup()` form. If some of these steps stay excluded on purpose, list them
in the Javadoc and the linked note.
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