VenuReddy2103 commented on a change in pull request #4110:
URL:
https://github.com/apache/carbondata/pull/4110#discussion_r610671534##########
File path: integration/spark/src/main/scala/org/apache/carbondata/index/secondary/SecondaryIndex.java
##########
@@ -0,0 +1,128 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *
http://www.apache.org/licenses/LICENSE-2.0+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.carbondata.index.secondary;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.carbondata.common.logging.LogServiceFactory;
+import org.apache.carbondata.core.datastore.block.SegmentProperties;
+import org.apache.carbondata.core.index.IndexUtil;
+import org.apache.carbondata.core.index.dev.IndexModel;
+import org.apache.carbondata.core.index.dev.cgindex.CoarseGrainIndex;
+import org.apache.carbondata.core.indexstore.Blocklet;
+import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
+import org.apache.carbondata.core.scan.expression.Expression;
+import org.apache.carbondata.core.scan.filter.executer.FilterExecutor;
+import org.apache.carbondata.core.scan.filter.resolver.FilterResolverIntf;
+import org.apache.carbondata.index.secondary.SecondaryIndexModel.PositionReferenceInfo;
+
+import org.apache.log4j.Logger;
+
+import static org.apache.carbondata.core.util.path.CarbonTablePath.BATCH_PREFIX;
+
+/**
+ * Secondary Index to prune at blocklet level.
+ */
+public class SecondaryIndex extends CoarseGrainIndex {
+ private static final Logger LOGGER =
+ LogServiceFactory.getLogService(SecondaryIndex.class.getName());
+ String indexName;
+ String currentSegmentId;
+ List<String> validSegmentIds;
+ PositionReferenceInfo positionReferenceInfo;
+
+ @Override
+ public void init(IndexModel indexModel) {
+ assert (indexModel instanceof SecondaryIndexModel);
+ SecondaryIndexModel model = (SecondaryIndexModel) indexModel;
+ indexName = model.indexName;
+ currentSegmentId = model.currentSegmentId;
+ validSegmentIds = model.validSegmentIds;
+ positionReferenceInfo = model.positionReferenceInfo;
+ }
+
+ private Set<String> getPositionReferences(String databaseName, String indexName,
+ Expression expression) {
+ synchronized (positionReferenceInfo) {
+ /* If the position references are not obtained yet(i.e., prune happening for the first valid
+ segment), then get them from the given index table with the given filter from all the valid
+ segments at once and store them as map of segmentId to set of position references in that
+ particular segment. Upon the subsequent prune for other segments, return the position
+ references for the respective segment from the map directly */
+ if (!positionReferenceInfo.fetched) {
+ Object[] rows = IndexUtil.getPositionReferences(String
+ .format("select distinct positionReference from %s.%s where insegment('%s') and %s",
+ databaseName, indexName, String.join(",", validSegmentIds),
+ expression.getStatement()));
+ for (Object row : rows) {
+ String positionReference = (String) row;
+ int blockPathIndex = positionReference.indexOf("/");
+ String segmentId = positionReference.substring(0, blockPathIndex);
+ String blockPath = positionReference.substring(blockPathIndex + 1);
+ Set<String> blockPaths = positionReferenceInfo.segmentToPosReferences
+ .computeIfAbsent(segmentId, k -> new HashSet<String>());
+ blockPaths.add(blockPath);
+ }
+ positionReferenceInfo.fetched = true;
+ }
+ }
+ Set<String> blockPaths = positionReferenceInfo.segmentToPosReferences.get(currentSegmentId);
+ return blockPaths != null ? blockPaths : new HashSet<String>();
+ }
+
+ @Override
+ public List<Blocklet> prune(FilterResolverIntf filterExp, SegmentProperties segmentProperties,
+ FilterExecutor filterExecutor, CarbonTable carbonTable) {
+ Set<String> positionReferences = getPositionReferences(carbonTable.getDatabaseName(), indexName,
+ filterExp.getFilterExpression());
+ List<Blocklet> blocklets = new ArrayList();
+ for (String blockPath : positionReferences) {
Review comment:
done. Have referred other places and modified.
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