unical1988 commented on code in PR #669: URL: https://github.com/apache/incubator-xtable/pull/669#discussion_r2051336288
########## xtable-core/src/main/java/org/apache/xtable/parquet/ParquetStatsExtractor.java: ########## @@ -0,0 +1,149 @@ +/* + * 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.xtable.parquet; + +import org.apache.xtable.model.schema.InternalSchema; + +import java.util.Collection; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Map; +import java.util.HashMap; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.TreeSet; +import java.util.Optional; + +import org.apache.xtable.model.stat.PartitionValue; +import org.apache.xtable.model.stat.ColumnStat; +import org.apache.xtable.model.stat.Range; +import lombok.Builder; +import org.apache.xtable.model.schema.InternalField; +import lombok.Value; +import org.apache.xtable.model.storage.InternalDataFile; +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; +import org.apache.xtable.model.storage.FileFormat; +import org.apache.xtable.model.config.InputPartitionFields; +import org.apache.hadoop.conf.Configuration; + +@Value +@Builder +public class ParquetStatsExtractor { + + private static final ParquetStatsExtractor INSTANCE = null; // new ParquetStatsExtractor(); + @Builder.Default Review Comment: removed Builder annotation ########## xtable-core/src/main/java/org/apache/xtable/parquet/ParquetSchemaExtractor.java: ########## @@ -0,0 +1,487 @@ +/* + * 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.xtable.parquet; + +import java.util.HashMap; +import java.util.Map; +import java.util.List; +import java.util.ArrayList; + +import org.apache.xtable.schema.SchemaUtils; +import org.apache.xtable.exception.SchemaExtractorException; + +import java.util.Collections; +import java.util.Optional; + +import lombok.AccessLevel; +import lombok.NoArgsConstructor; + +import java.util.Arrays; +import java.util.Collections; +import java.util.function.Function; +import java.util.stream.Collectors; + +import org.apache.xtable.hudi.idtracking.models.IdMapping; +import org.apache.avro.Schema; +import org.apache.parquet.schema.GroupType; +import org.apache.parquet.schema.LogicalTypeAnnotation; +import org.apache.parquet.schema.MessageType; +import org.apache.parquet.schema.PrimitiveType; +import org.apache.parquet.schema.Type; +import org.apache.xtable.collectors.CustomCollectors; +import org.apache.xtable.exception.UnsupportedSchemaTypeException; +import org.apache.xtable.model.schema.InternalField; +import org.apache.parquet.schema.Type.Repetition; +import org.apache.xtable.model.schema.InternalSchema; +import org.apache.xtable.model.schema.InternalType; +import org.apache.parquet.schema.Type.ID; +import org.apache.parquet.schema.OriginalType; +import org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName; +import org.apache.parquet.schema.Types; +import org.apache.parquet.column.ColumnDescriptor; + + +/** + * Class that converts parquet Schema {@link Schema} to Canonical Schema {@link InternalSchema} and + * vice-versa. This conversion is fully reversible and there is a strict 1 to 1 mapping between + * parquet data types and canonical data types. + */ +@NoArgsConstructor(access = AccessLevel.PRIVATE) +public class ParquetSchemaExtractor { + // parquet only supports string keys in maps + private static final InternalField MAP_KEY_FIELD = + InternalField.builder() + .name(InternalField.Constants.MAP_KEY_FIELD_NAME) + .schema( + InternalSchema.builder() + .name("map_key") + .dataType(InternalType.STRING) + .isNullable(false) + .build()) + .defaultValue("") + .build(); + private static final ParquetSchemaExtractor INSTANCE = new ParquetSchemaExtractor(); + private static final String ELEMENT = "element"; + private static final String KEY = "key"; + private static final String VALUE = "value"; + + public static ParquetSchemaExtractor getInstance() { + return INSTANCE; + } + + private static boolean isNullable(Type schema) { + return schema.getRepetition() == Repetition.REQUIRED ? false : true; + } + + + /** + * Converts the parquet {@link Schema} to {@link InternalSchema}. + * + * @param schema The schema being converted + * @param parentPath If this schema is nested within another, this will be a dot separated string + * representing the path from the top most field to the current schema. + * @return a converted schema + */ + public InternalSchema toInternalSchema( + Type schema, String parentPath) { + InternalType newDataType = null; + Type.Repetition currentRepetition = null; + List<InternalField> subFields = new ArrayList<>(); + PrimitiveType primitiveType; + LogicalTypeAnnotation logicalType; + Map<InternalSchema.MetadataKey, Object> metadata = new HashMap<>(); Review Comment: done -- This is an automated message from the Apache Git Service. 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