unical1988 commented on code in PR #650: URL: https://github.com/apache/incubator-xtable/pull/650#discussion_r1986360897
########## xtable-core/src/main/java/org/apache/xtable/parquet/ParquetStatsExtractor.java: ########## @@ -0,0 +1,139 @@ +/* + * 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. + */ + +import java.util.stream.Collectors; + +import org.apache.hadoop.fs.*; +import org.apache.parquet.column.ColumnDescriptor; +import org.apache.parquet.column.Encoding; +import org.apache.parquet.column.statistics.Statistics; +import org.apache.parquet.hadoop.metadata.BlockMetaData; +import org.apache.parquet.hadoop.metadata.ColumnChunkMetaData; +import org.apache.parquet.hadoop.metadata.ParquetMetadata; +import org.apache.parquet.schema.MessageType; + +public class ParquetStatsExtractor { + @Builder.Default + private static final ParquetMetadataExtractor parquetMetadataExtractor = + ParquetMetadataExtractor.getInstance(); + + @Builder.Default + private static final ParquetPartitionExtractor partitionExtractor = + ParquetPartitionExtractor.getInstance(); + + private static Map<ColumnDescriptor, ColStats> stats = + new LinkedHashMap<ColumnDescriptor, ColStats>(); + private static long recordCount = 0; + + private Map<String, List<String>> initPartitionInfo() { + return getPartitionFromDirectoryStructure(hadoopConf, basePath, Collections.emptyMap()); + } + + private InternalDataFile toInternalDataFile( + Configuration hadoopConf, String parentPath, Map<ColumnDescriptor, ColStats> stats) { + FileSystem fs = FileSystem.get(hadoopConf); + FileStatus file = fs.getFileStatus(new Path(parentPath)); + Map<String, List<String>> partitionInfo = initPartitionInfo(); + + ParquetMetadata footer = parquetMetadataExtractor.readParquetMetadata(hadoopConf, parentPath); + MessageType schema = parquetMetadataExtractor.getSchema(footer); + InternalSchema schema = schemaExtractor.toInternalSchema(schema); + List<PartitionValue> partitionValues = + partitionExtractor.getPartitionValue( + parentPath, file.getPath().toString(), schema, partitionInfo); + return InternalDataFile.builder() + .physicalPath(parentPath) + .fileFormat(FileFormat.APACHE_PARQUET) + .partitionValues(partitionValues) + .fileSizeBytes(file.getLen()) + .recordCount(recordCount) + .columnStats(stats.values().stream().collect(Collectors.toList())) + .lastModified(file.getModificationTime()) + .build(); + } + + private static void getColumnStatsForaFile(ParquetMetadata footer) { + for (BlockMetaData blockMetaData : footer.getBlocks()) { + + MessageType schema = parquetMetadataExtractor.getSchema(footer); + recordCount += blockMetaData.getRowCount(); + List<ColumnChunkMetaData> columns = blockMetaData.getColumns(); + for (ColumnChunkMetaData columnMetaData : columns) { + ColumnDescriptor desc = schema.getColumnDescription(columnMetaData.getPath().toArray()); + ColStats.add( + desc, + columnMetaData.getValueCount(), + columnMetaData.getTotalSize(), + columnMetaData.getTotalUncompressedSize(), + columnMetaData.getEncodings(), + columnMetaData.getStatistics()); + } + } + } + + private static class Stats { + long min = Long.MAX_VALUE; + long max = Long.MIN_VALUE; + long total = 0; + + public void add(long length) { + min = Math.min(length, min); + max = Math.max(length, max); + total += length; + } + } + + private static class ColStats { + + Stats valueCountStats = new Stats(); + Stats allStats = new Stats(); + Stats uncStats = new Stats(); Review Comment: uncompressed -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@xtable.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
