Draft: hoping to avoid keeping SecondaryIdQuery subPlans, that are not needed

backend/src/main/java/com/bakdata/conquery/apiv1/query/SecondaryIdQuery.java

@@ -26,6 +26,7 @@
 import com.bakdata.conquery.models.query.QueryResolveContext;
 import com.bakdata.conquery.models.query.RequiredEntities;
 import com.bakdata.conquery.models.query.Visitable;
+import com.bakdata.conquery.models.query.queryplan.ConceptQueryPlan;
 import com.bakdata.conquery.models.query.queryplan.SecondaryIdQueryPlan;
 import com.bakdata.conquery.models.query.resultinfo.ResultInfo;
 import com.bakdata.conquery.models.query.resultinfo.SimpleResultInfo;
@@ -66,8 +67,9 @@ public class SecondaryIdQuery extends Query {
 
 	@Override
 	public SecondaryIdQueryPlan createQueryPlan(QueryPlanContext context) {
+		final ConceptQueryPlan queryPlan = query.createQueryPlan(context.withSelectedSecondaryId(secondaryId));
 
-		return new SecondaryIdQueryPlan(query, context, secondaryId, withSecondaryId, withoutSecondaryId, query.createQueryPlan(context.withSelectedSecondaryId(secondaryId)));
+		return new SecondaryIdQueryPlan(query, context, secondaryId, withSecondaryId, withoutSecondaryId, queryPlan, context.getSecondaryIdSubPlanRetention());
 	}
 
 	@Override

backend/src/main/java/com/bakdata/conquery/commands/ShardNode.java

@@ -106,7 +106,8 @@ protected void run(Environment environment, Namespace namespace, ConqueryConfig
 				getConfig().getQueries().getExecutionPool(),
 				() -> createInternalObjectMapper(View.Persistence.Shard.class),
 				() -> createInternalObjectMapper(View.InternalCommunication.class),
-				getConfig().getCluster().getEntityBucketSize()
+				getConfig().getCluster().getEntityBucketSize(),
+				getConfig().getQueries().getSecondaryIdSubPlanRetention()
 		);
 
 		final Collection<WorkerStorage> workerStorages = config.getStorage().discoverWorkerStorages();

backend/src/main/java/com/bakdata/conquery/models/config/QueryConfig.java

@@ -11,4 +11,12 @@ public class QueryConfig {
 	private ThreadPoolDefinition executionPool = new ThreadPoolDefinition();
 
 	private Duration oldQueriesTime = Duration.days(30);
+
+	/**
+	 * Limits how many subQuery-Plans should be cached between executions:
+	 * This number limits how many sub-plans are cached per core so that outliers do not cause massive memory overhead.
+	 *
+	 * TODO Implement global limit of active secondaryId sub plans
+	 */
+	private int secondaryIdSubPlanRetention = 15;
 }

backend/src/main/java/com/bakdata/conquery/models/messages/namespaces/specific/ExecuteForm.java

@@ -66,7 +66,7 @@ public void react(Worker worker) throws Exception {
 
 			// Before we start the query, we create it once to test if it will succeed before creating it multiple times for evaluation per core.
 			try {
-				query.createQueryPlan(new QueryPlanContext(worker));
+				query.createQueryPlan(new QueryPlanContext(worker, queryExecutor.getSecondaryIdSubPlanLimit()));
 			}
 			catch (Exception e) {
 				ConqueryError err = asConqueryError(e);

backend/src/main/java/com/bakdata/conquery/models/messages/namespaces/specific/ExecuteQuery.java

@@ -52,7 +52,7 @@ public void react(Worker worker) throws Exception {
 
 		// Before we start the query, we create it once to test if it will succeed before creating it multiple times for evaluation per core.
 		try {
-			query.createQueryPlan(new QueryPlanContext(worker));
+			query.createQueryPlan(new QueryPlanContext(worker, queryExecutor.getSecondaryIdSubPlanLimit()));
 		}
 		catch (Exception e) {
 			ConqueryError err = asConqueryError(e);

backend/src/main/java/com/bakdata/conquery/models/query/QueryExecutor.java

@@ -25,17 +25,19 @@
 import com.bakdata.conquery.models.query.results.ShardResult;
 import com.bakdata.conquery.models.worker.Worker;
 import com.google.common.util.concurrent.MoreExecutors;
-import lombok.RequiredArgsConstructor;
+import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
-@RequiredArgsConstructor
+@Data
 public class QueryExecutor implements Closeable {
 
 	private final Worker worker;
 
 	private final ThreadPoolExecutor executor;
 
+	private final int secondaryIdSubPlanLimit;
+
 	private final Set<ManagedExecutionId> cancelledQueries = new HashSet<>();
 
 	public void unsetQueryCancelled(ManagedExecutionId query) {
@@ -52,7 +54,7 @@ public boolean isCancelled(ManagedExecutionId query) {
 
 	public boolean execute(Query query, QueryExecutionContext executionContext, ShardResult result, Set<Entity> entities) {
 
-		final ThreadLocal<QueryPlan<?>> plan = ThreadLocal.withInitial(() -> query.createQueryPlan(new QueryPlanContext(worker)));
+		final ThreadLocal<QueryPlan<?>> plan = ThreadLocal.withInitial(() -> query.createQueryPlan(new QueryPlanContext(worker, secondaryIdSubPlanLimit)));
 
 		if (entities.isEmpty()) {
 			log.warn("Entities for query are empty");

backend/src/main/java/com/bakdata/conquery/models/query/QueryPlanContext.java

@@ -11,18 +11,22 @@
 import com.bakdata.conquery.models.worker.Worker;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
+import lombok.Data;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import lombok.With;
 
-@RequiredArgsConstructor @AllArgsConstructor @Getter @With
+@Data @With
+@AllArgsConstructor @RequiredArgsConstructor
 public class QueryPlanContext {
 
 	@Getter(AccessLevel.NONE)
 	private final Worker worker;
+	private final int secondaryIdSubPlanRetention;
 
 	private CDateRange dateRestriction = CDateRange.all();
 
+
 	/**
 	 * Set if in {@link com.bakdata.conquery.models.query.queryplan.SecondaryIdQueryPlan}, to the query-active {@link SecondaryIdDescriptionId}.
 	 */

backend/src/main/java/com/bakdata/conquery/models/query/filter/RangeFilterNode.java

@@ -2,6 +2,7 @@
 
 import com.bakdata.conquery.models.common.IRange;
 import com.bakdata.conquery.models.query.queryplan.aggregators.Aggregator;
+import com.bakdata.conquery.models.query.queryplan.filter.AggregationResultFilterNode;
 import lombok.ToString;
 
 /**

backend/src/main/java/com/bakdata/conquery/models/query/queryplan/ConceptQueryPlan.java

@@ -63,8 +63,8 @@ public void init(QueryExecutionContext ctx, Entity entity) {
 		child.init(entity, ctx);
 	}
 
-	public void nextEvent(Bucket bucket, int event) {
-		getChild().acceptEvent(bucket, event);
+	public boolean nextEvent(Bucket bucket, int event) {
+		return getChild().acceptEvent(bucket, event);
 	}
 
 	protected SinglelineEntityResult createResult() {

backend/src/main/java/com/bakdata/conquery/models/query/queryplan/DateAggregator.java

@@ -48,7 +48,7 @@ public void init(Entity entity, QueryExecutionContext context) {
 	}
 
 	@Override
-    public void acceptEvent(Bucket bucket, int event) {
+    public void consumeEvent(Bucket bucket, int event) {
         throw new UnsupportedOperationException("This Aggregator uses the result of its siblings and does not accept events");
     }
 

backend/src/main/java/com/bakdata/conquery/models/query/queryplan/EventIterating.java

@@ -25,7 +25,7 @@ public abstract class EventIterating {
 	public void collectRequiredTables(Set<Table> requiredTables) {
 	}
 
-	public Set<Table> collectRequiredTables() {
+	public final Set<Table> collectRequiredTables() {
 		Set<Table> out = new HashSet<>();
 		collectRequiredTables(out);
 		return out;
@@ -42,7 +42,12 @@ public void nextTable(QueryExecutionContext ctx, Table currentTable) {
 	public void nextBlock(Bucket bucket) {
 	}
 
-	public abstract void acceptEvent(Bucket bucket, int event);
+	/**
+	 * Consume the event of the bucket.
+	 *
+	 * @implSpec If the event was not consumed, may return false. This can be used to discard intermediate results. Currently, only relevant for {@link SecondaryIdQueryPlan}, where subplans are discarded if no event was consumed.
+	 */
+	public abstract boolean acceptEvent(Bucket bucket, int event);
 
 
 	public boolean isOfInterest(Bucket bucket) {

backend/src/main/java/com/bakdata/conquery/models/query/queryplan/QPNode.java

@@ -34,7 +34,7 @@ public void nextTable(QueryExecutionContext ctx, Table currentTable) {
 	}
 
 	@Override
-	public abstract void acceptEvent(Bucket bucket, int event);
+	public abstract boolean acceptEvent(Bucket bucket, int event);
 
 	public abstract boolean isContained();
 

backend/src/main/java/com/bakdata/conquery/models/query/queryplan/QPParentNode.java

@@ -117,10 +117,13 @@ public boolean isOfInterest(Entity entity) {
 	}
 
 	@Override
-	public void acceptEvent(Bucket bucket, int event) {
+	public boolean acceptEvent(Bucket bucket, int event) {
+		boolean consumed = false;
 		for (QPNode currentTableChild : currentTableChildren) {
-			currentTableChild.acceptEvent(bucket, event);
+			consumed |= currentTableChild.acceptEvent(bucket, event);
 		}
+
+		return consumed;
 	}
 
 	@Override