Star tree merge changes

Signed-off-by: Bharathwaj G <[email protected]>

server/src/main/java/org/opensearch/index/codec/composite/Composite90DocValuesReader.java

@@ -17,9 +17,9 @@
 import org.apache.lucene.index.SortedNumericDocValues;
 import org.apache.lucene.index.SortedSetDocValues;
 import org.opensearch.common.annotation.ExperimentalApi;
-import org.opensearch.index.mapper.CompositeMappedFieldType;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -74,15 +74,14 @@ public void close() throws IOException {
     }
 
     @Override
-    public List<String> getCompositeIndexFields() {
+    public List<CompositeIndexFieldInfo> getCompositeIndexFields() {
         // todo : read from file formats and get the field names.
-        throw new UnsupportedOperationException();
+        return new ArrayList<>();
 
     }
 
     @Override
-    public CompositeIndexValues getCompositeIndexValues(String field, CompositeMappedFieldType.CompositeFieldType fieldType)
-        throws IOException {
+    public CompositeIndexValues getCompositeIndexValues(CompositeIndexFieldInfo compositeIndexFieldInfo) throws IOException {
         // TODO : read compositeIndexValues [starTreeValues] from star tree files
         throw new UnsupportedOperationException();
     }

server/src/main/java/org/opensearch/index/codec/composite/Composite90DocValuesWriter.java

@@ -8,19 +8,26 @@
 
 package org.opensearch.index.codec.composite;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.apache.lucene.codecs.DocValuesConsumer;
 import org.apache.lucene.codecs.DocValuesProducer;
 import org.apache.lucene.index.FieldInfo;
 import org.apache.lucene.index.MergeState;
 import org.apache.lucene.index.SegmentWriteState;
 import org.opensearch.common.annotation.ExperimentalApi;
+import org.opensearch.index.codec.composite.datacube.startree.StarTreeValues;
+import org.opensearch.index.compositeindex.datacube.startree.StarTreeField;
+import org.opensearch.index.compositeindex.datacube.startree.builder.StarTreesBuilder;
 import org.opensearch.index.mapper.CompositeMappedFieldType;
 import org.opensearch.index.mapper.MapperService;
 import org.opensearch.index.mapper.StarTreeMapper;
 
 import java.io.IOException;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -40,6 +47,7 @@ public class Composite90DocValuesWriter extends DocValuesConsumer {
     private final Set<String> compositeFieldSet;
 
     private final Map<String, DocValuesProducer> fieldProducerMap = new HashMap<>();
+    private static final Logger logger = LogManager.getLogger(Composite90DocValuesWriter.class);
 
     public Composite90DocValuesWriter(DocValuesConsumer delegate, SegmentWriteState segmentWriteState, MapperService mapperService)
         throws IOException {
@@ -101,6 +109,8 @@ private void createCompositeIndicesIfPossible(DocValuesProducer valuesProducer,
                     // TODO : Call StarTree builder
                 }
             }
+            StarTreesBuilder starTreesBuilder = new StarTreesBuilder(state, mapperService);
+            starTreesBuilder.build(fieldProducerMap);
         }
     }
 
@@ -109,7 +119,57 @@ public void merge(MergeState mergeState) throws IOException {
         // TODO : check if class variable will cause concurrency issues
         this.mergeState = mergeState;
         super.merge(mergeState);
-        // TODO : handle merge star tree
-        // mergeStarTreeFields(mergeState);
+        mergeCompositeFields(mergeState);
+    }
+
+    /**
+     * Merges composite fields from multiple segments
+     * @param mergeState merge state
+     */
+    private void mergeCompositeFields(MergeState mergeState) throws IOException {
+        mergeStarTreeFields(mergeState);
+    }
+
+    /**
+     * Merges star tree data fields from multiple segments
+     * @param mergeState merge state
+     */
+    private void mergeStarTreeFields(MergeState mergeState) throws IOException {
+        Map<String, List<StarTreeValues>> starTreeSubsPerField = new HashMap<>();
+        Map<String, StarTreeField> starTreeFieldMap = new HashMap<>();
+        for (int i = 0; i < mergeState.docValuesProducers.length; i++) {
+            CompositeIndexReader reader = null;
+            if (mergeState.docValuesProducers[i] == null) {
+                continue;
+            }
+            if (mergeState.docValuesProducers[i] instanceof CompositeIndexReader) {
+                reader = (CompositeIndexReader) mergeState.docValuesProducers[i];
+            } else {
+                continue;
+            }
+
+            List<CompositeIndexFieldInfo> compositeFieldInfo = reader.getCompositeIndexFields();
+            for (CompositeIndexFieldInfo fieldInfo : compositeFieldInfo) {
+                if (fieldInfo.getType().equals(CompositeMappedFieldType.CompositeFieldType.STAR_TREE)) {
+                    CompositeIndexValues compositeIndexValues = reader.getCompositeIndexValues(fieldInfo);
+                    if (compositeIndexValues instanceof StarTreeValues) {
+                        List<StarTreeValues> fieldsList = starTreeSubsPerField.getOrDefault(fieldInfo.getField(), Collections.emptyList());
+                        if (!starTreeFieldMap.containsKey(fieldInfo.getField())) {
+                            starTreeFieldMap.put(fieldInfo.getField(), ((StarTreeValues) compositeIndexValues).getStarTreeField());
+                        }
+                        // assert star tree configuration is same across segments
+                        else {
+                            assert starTreeFieldMap.get(fieldInfo.getField())
+                                .equals(((StarTreeValues) compositeIndexValues).getStarTreeField());
+                            logger.error("Star tree configuration is not same for segments during merge");
+                        }
+                        fieldsList.add((StarTreeValues) compositeIndexValues);
+                        starTreeSubsPerField.put(fieldInfo.getField(), fieldsList);
+                    }
+                }
+            }
+        }
+        final StarTreesBuilder starTreesBuilder = new StarTreesBuilder(state, mapperService);
+        starTreesBuilder.buildDuringMerge(starTreeFieldMap, starTreeSubsPerField);
     }
 }

server/src/main/java/org/opensearch/index/codec/composite/CompositeIndexFieldInfo.java

@@ -0,0 +1,36 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.index.codec.composite;
+
+import org.opensearch.common.annotation.ExperimentalApi;
+import org.opensearch.index.mapper.CompositeMappedFieldType;
+
+/**
+ * Field info details of composite index fields
+ *
+ * @opensearch.experimental
+ */
+@ExperimentalApi
+public class CompositeIndexFieldInfo {
+    private final String field;
+    private final CompositeMappedFieldType.CompositeFieldType type;
+
+    public CompositeIndexFieldInfo(String field, CompositeMappedFieldType.CompositeFieldType type) {
+        this.field = field;
+        this.type = type;
+    }
+
+    public String getField() {
+        return field;
+    }
+
+    public CompositeMappedFieldType.CompositeFieldType getType() {
+        return type;
+    }
+}

server/src/main/java/org/opensearch/index/codec/composite/CompositeIndexReader.java

@@ -9,7 +9,6 @@
 package org.opensearch.index.codec.composite;
 
 import org.opensearch.common.annotation.ExperimentalApi;
-import org.opensearch.index.mapper.CompositeMappedFieldType;
 
 import java.io.IOException;
 import java.util.List;
@@ -25,10 +24,10 @@ public interface CompositeIndexReader {
      * Get list of composite index fields from the segment
      *
      */
-    List<String> getCompositeIndexFields();
+    List<CompositeIndexFieldInfo> getCompositeIndexFields();
 
     /**
      * Get composite index values based on the field name and the field type
      */
-    CompositeIndexValues getCompositeIndexValues(String field, CompositeMappedFieldType.CompositeFieldType fieldType) throws IOException;
+    CompositeIndexValues getCompositeIndexValues(CompositeIndexFieldInfo fieldInfo) throws IOException;
 }

server/src/main/java/org/opensearch/index/codec/composite/datacube/startree/StarTreeValues.java

@@ -8,10 +8,13 @@
 
 package org.opensearch.index.codec.composite.datacube.startree;
 
+import org.apache.lucene.search.DocIdSetIterator;
 import org.opensearch.common.annotation.ExperimentalApi;
 import org.opensearch.index.codec.composite.CompositeIndexValues;
+import org.opensearch.index.compositeindex.datacube.startree.StarTreeField;
+import org.opensearch.index.compositeindex.datacube.startree.node.StarTreeNode;
 
-import java.util.List;
+import java.util.Map;
 
 /**
  * Concrete class that holds the star tree associated values from the segment
@@ -20,16 +23,41 @@
  */
 @ExperimentalApi
 public class StarTreeValues implements CompositeIndexValues {
-    private final List<String> dimensionsOrder;
+    private final StarTreeField starTreeField;
+    private final StarTreeNode root;
+    private final Map<String, DocIdSetIterator> dimensionDocValuesIteratorMap;
+    private final Map<String, DocIdSetIterator> metricDocValuesIteratorMap;
 
-    // TODO : come up with full set of vales such as dimensions and metrics doc values + star tree
-    public StarTreeValues(List<String> dimensionsOrder) {
-        super();
-        this.dimensionsOrder = dimensionsOrder;
+    public StarTreeValues(
+        StarTreeField starTreeField,
+        StarTreeNode root,
+        Map<String, DocIdSetIterator> dimensionDocValuesIteratorMap,
+        Map<String, DocIdSetIterator> metricDocValuesIteratorMap
+    ) {
+        this.starTreeField = starTreeField;
+        this.root = root;
+        this.dimensionDocValuesIteratorMap = dimensionDocValuesIteratorMap;
+        this.metricDocValuesIteratorMap = metricDocValuesIteratorMap;
     }
 
     @Override
     public CompositeIndexValues getValues() {
         return this;
     }
+
+    public StarTreeField getStarTreeField() {
+        return starTreeField;
+    }
+
+    public StarTreeNode getRoot() {
+        return root;
+    }
+
+    public Map<String, DocIdSetIterator> getDimensionDocValuesIteratorMap() {
+        return dimensionDocValuesIteratorMap;
+    }
+
+    public Map<String, DocIdSetIterator> getMetricDocValuesIteratorMap() {
+        return metricDocValuesIteratorMap;
+    }
 }

server/src/main/java/org/opensearch/index/compositeindex/datacube/startree/aggregators/MetricAggregatorInfo.java

@@ -9,7 +9,6 @@
 
 import org.opensearch.index.compositeindex.datacube.MetricStat;
 import org.opensearch.index.compositeindex.datacube.startree.aggregators.numerictype.StarTreeNumericType;
-import org.opensearch.index.compositeindex.datacube.startree.utils.SequentialDocValuesIterator;
 import org.opensearch.index.fielddata.IndexNumericFieldData;
 
 import java.util.Comparator;
@@ -28,22 +27,14 @@ public class MetricAggregatorInfo implements Comparable<MetricAggregatorInfo> {
     private final String field;
     private final ValueAggregator valueAggregators;
     private final StarTreeNumericType starTreeNumericType;
-    private final SequentialDocValuesIterator metricStatReader;
 
     /**
      * Constructor for MetricAggregatorInfo
      */
-    public MetricAggregatorInfo(
-        MetricStat metricStat,
-        String field,
-        String starFieldName,
-        IndexNumericFieldData.NumericType numericType,
-        SequentialDocValuesIterator metricStatReader
-    ) {
+    public MetricAggregatorInfo(MetricStat metricStat, String field, String starFieldName, IndexNumericFieldData.NumericType numericType) {
         this.metricStat = metricStat;
         this.valueAggregators = ValueAggregatorFactory.getValueAggregator(metricStat);
         this.starTreeNumericType = StarTreeNumericType.fromNumericType(numericType);
-        this.metricStatReader = metricStatReader;
         this.field = field;
         this.starFieldName = starFieldName;
         this.metric = toFieldName();
@@ -84,13 +75,6 @@ public StarTreeNumericType getAggregatedValueType() {
         return starTreeNumericType;
     }
 
-    /**
-     * @return metric value reader iterator
-     */
-    public SequentialDocValuesIterator getMetricStatReader() {
-        return metricStatReader;
-    }
-
     /**
      * @return field name with metric type and field
      */