vvysotskyi commented on a change in pull request #1810: DRILL-7271: Refactor Metadata interfaces and classes to contain all needed information for the File based Metastore URL: https://github.com/apache/drill/pull/1810#discussion_r296753490
########## File path: metastore/metastore-api/src/main/java/org/apache/drill/metastore/metadata/BaseMetadata.java ########## @@ -0,0 +1,148 @@ +/* + * 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.drill.metastore.metadata; + +import org.apache.drill.common.expression.SchemaPath; +import org.apache.drill.exec.record.metadata.ColumnMetadata; +import org.apache.drill.exec.record.metadata.TupleMetadata; +import org.apache.drill.metastore.SchemaPathUtils; +import org.apache.drill.metastore.statistics.ColumnStatistics; +import org.apache.drill.metastore.statistics.StatisticsHolder; +import org.apache.drill.metastore.statistics.StatisticsKind; + +import java.util.Collection; +import java.util.Map; +import java.util.Objects; +import java.util.function.Function; +import java.util.stream.Collectors; + +/** + * Common provider of tuple schema, column metadata, and statistics for table, partition, file or row group. + */ +public abstract class BaseMetadata implements Metadata { + protected final TableInfo tableInfo; + protected final MetadataInfo metadataInfo; + protected final TupleMetadata schema; + protected final Map<SchemaPath, ColumnStatistics> columnsStatistics; + protected final Map<String, StatisticsHolder> statistics; + + protected <T extends BaseMetadataBuilder<T>> BaseMetadata(BaseMetadataBuilder<T> builder) { + this.tableInfo = builder.tableInfo; + this.metadataInfo = builder.metadataInfo; + this.schema = builder.schema; + this.columnsStatistics = builder.columnsStatistics; + this.statistics = builder.statistics.stream() + .collect(Collectors.toMap( + statistic -> statistic.getStatisticsKind().getName(), + Function.identity(), + (a, b) -> a.getStatisticsKind().isExact() ? a : b)); + } + + @Override + public Map<SchemaPath, ColumnStatistics> getColumnsStatistics() { + return columnsStatistics; + } + + @Override + public ColumnStatistics getColumnStatistics(SchemaPath columnName) { + return columnsStatistics.get(columnName); + } + + @Override + public TupleMetadata getSchema() { + return schema; + } + + @Override + @SuppressWarnings("unchecked") + public <V> V getStatistic(StatisticsKind<V> statisticsKind) { + StatisticsHolder<V> statisticsHolder = statistics.get(statisticsKind.getName()); + return statisticsHolder != null ? statisticsHolder.getStatisticsValue() : null; + } + + @Override + public boolean containsExactStatistics(StatisticsKind statisticsKind) { + StatisticsHolder statisticsHolder = statistics.get(statisticsKind.getName()); + return statisticsHolder != null && statisticsHolder.getStatisticsKind().isExact(); + } + + @Override + @SuppressWarnings("unchecked") + public <V> V getStatisticsForColumn(SchemaPath columnName, StatisticsKind<V> statisticsKind) { + return (V) columnsStatistics.get(columnName).get(statisticsKind); + } + + @Override + public ColumnMetadata getColumn(SchemaPath name) { + return SchemaPathUtils.getColumnMetadata(name, schema); + } + + @Override + public TableInfo getTableInfo() { + return tableInfo; + } + + @Override + public MetadataInfo getMetadataInfo() { + return metadataInfo; + } + + public static abstract class BaseMetadataBuilder<T extends BaseMetadataBuilder<T>> { + protected TableInfo tableInfo; + protected MetadataInfo metadataInfo; + protected TupleMetadata schema; + protected Map<SchemaPath, ColumnStatistics> columnsStatistics; + protected Collection<StatisticsHolder> statistics; + + public T withTableInfo(TableInfo tableInfo) { + this.tableInfo = tableInfo; + return self(); + } + + public T withMetadataInfo(MetadataInfo metadataInfo) { + this.metadataInfo = metadataInfo; + return self(); + } + + public T withSchema(TupleMetadata schema) { + this.schema = schema; + return self(); + } + + public T withColumnsStatistics(Map<SchemaPath, ColumnStatistics> columnsStatistics) { + this.columnsStatistics = columnsStatistics; + return self(); + } + + public T withStatistics(Collection<StatisticsHolder> statistics) { + this.statistics = statistics; + return self(); + } + + protected void checkSetValues() { + Objects.requireNonNull(tableInfo, "tableInfo was not set"); + Objects.requireNonNull(metadataInfo, "metadataInfo was not set"); + Objects.requireNonNull(columnsStatistics, "columnsStatistics was not set"); + Objects.requireNonNull(statistics, "statistics was not set"); Review comment: Done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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