akashrn5 commented on a change in pull request #3584: [CARBONDATA-3718] Support SegmentLevel MinMax for better Pruning and less driver memory usage for cache
URL:
https://github.com/apache/carbondata/pull/3584#discussion_r394327598
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File path: core/src/main/java/org/apache/carbondata/core/segmentmeta/SegmentMetaDataInfoStats.java
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@@ -0,0 +1,170 @@
+/*
+ * 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.core.segmentmeta;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.util.ByteUtil;
+
+/**
+ * Holds segment level meta data information such as min,max, sortColumn info for the
+ * corresponding table
+ */
+public class SegmentMetaDataInfoStats {
+
+ private SegmentMetaDataInfoStats() {
+ tableSegmentMetaDataInfoMap = new LinkedHashMap<>();
+ }
+
+ public static synchronized SegmentMetaDataInfoStats getInstance() {
+ if (null == segmentMetaDataInfoStats) {
+ segmentMetaDataInfoStats = new SegmentMetaDataInfoStats();
+ return segmentMetaDataInfoStats;
+ } else {
+ return segmentMetaDataInfoStats;
+ }
+ }
+
+ private Map<String, Map<String, BlockColumnMetaDataInfo>> tableSegmentMetaDataInfoMap;
+
+ private static SegmentMetaDataInfoStats segmentMetaDataInfoStats;
+
+ /**
+ * Prepare of map with key as column-id and value as SegmentColumnMetaDataInfo using the
+ * tableSegmentMetaDataInfoMap
+ *
+ * @param tableName get corresponding tableName from map
+ * @param segmentId get corresponding segment Id from map
+ * @return segmentMetaDataInfo for the corresponding segment
+ */
+ public synchronized SegmentMetaDataInfo getTableSegmentMetaDataInfo(String tableName,
+ String segmentId) {
+ Map<String, SegmentColumnMetaDataInfo> segmentColumnMetaDataInfoMap = new LinkedHashMap<>();
+ Map<String, BlockColumnMetaDataInfo> segmentMetaDataInfoMap =
+ this.tableSegmentMetaDataInfoMap.get(tableName);
+ if (null != segmentMetaDataInfoMap && !segmentMetaDataInfoMap.isEmpty()
+ && null != segmentMetaDataInfoMap.get(segmentId)) {
+ BlockColumnMetaDataInfo blockColumnMetaDataInfo = segmentMetaDataInfoMap.get(segmentId);
+ System.out.println("Column Schemas Size: " + blockColumnMetaDataInfo.getColumnSchemas().size()
+ + " Min size: " + blockColumnMetaDataInfo.getMin().length);
+ for (int i = 0; i < blockColumnMetaDataInfo.getColumnSchemas().size(); i++) {
+ org.apache.carbondata.format.ColumnSchema columnSchema =
+ blockColumnMetaDataInfo.getColumnSchemas().get(i);
+ boolean isSortColumn = false;
+ boolean isColumnDrift = false;
+ if (null != columnSchema.columnProperties && !columnSchema.columnProperties.isEmpty()) {
+ if (null != columnSchema.columnProperties.get(CarbonCommonConstants.SORT_COLUMNS)) {
+ isSortColumn = true;
+ }
+ if (null != columnSchema.columnProperties.get(CarbonCommonConstants.COLUMN_DRIFT)) {
+ isColumnDrift = true;
+ }
+ }
+ segmentColumnMetaDataInfoMap.put(columnSchema.column_id,
+ new SegmentColumnMetaDataInfo(isSortColumn, blockColumnMetaDataInfo.getMin()[i],
+ blockColumnMetaDataInfo.getMax()[i], isColumnDrift));
+ }
+ }
+ return new SegmentMetaDataInfo(segmentColumnMetaDataInfoMap);
+ }
+
+ public synchronized void setBlockMetaDataInfo(String tableName, String segmentId,
+ BlockColumnMetaDataInfo currentBlockColumnMetaInfo) {
+ // check if tableName is present in tableSegmentMetaDataInfoMap
+ if (!this.tableSegmentMetaDataInfoMap.isEmpty() && null != this.tableSegmentMetaDataInfoMap
+ .get(tableName) && !this.tableSegmentMetaDataInfoMap.get(tableName).isEmpty()
Review comment:
i thin `!this.tableSegmentMetaDataInfoMap.get(tableName).isEmpty()` this check is not needed, please check again and remove if not required
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