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feat: optimized aggregation pipeline to use indexes when possible #253

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feat: optimized aggregation pipeline to use indexes when possible #253

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9 changes: 9 additions & 0 deletions core/src/main/java/de/bwaldvogel/mongo/backend/aggregation/Aggregation.java
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Original file line number Diff line number Diff line change
Expand Up @@ -189,6 +189,15 @@ public static Aggregation fromPipeline(List<Document> pipeline, DatabaseResolver
}

private List<Document> runStages() {
// Only apply index optimization if there are no variables to inject
// Variables need to be added to documents before $match can evaluate them
if (!hasVariables()) {
return stages.stream()
.filter(stage -> stage instanceof MatchStage)
.findFirst()
.map(match -> runStages(collection.handleQueryAsStream(((MatchStage) match).getQuery())))
.orElseGet(() -> runStages(collection.queryAllAsStream()));
}
return runStages(collection.queryAllAsStream());
}

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4 changes: 4 additions & 0 deletions core/src/main/java/de/bwaldvogel/mongo/backend/aggregation/stage/MatchStage.java
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Expand Up @@ -24,4 +24,8 @@ public String name() {
public Stream<Document> apply(Stream<Document> stream) {
return stream.filter(document -> queryMatcher.matches(document, query));
}

public Document getQuery() {
return query;
}
}