org.apache.drill.exec.planner.ParquetPartitionDescriptor.java Source code

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Here is the source code for org.apache.drill.exec.planner.ParquetPartitionDescriptor.java

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/**
 * 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.exec.planner;

import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.util.BitSets;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.types.TypeProtos;
import org.apache.drill.exec.physical.base.FileGroupScan;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.planner.logical.DrillRel;
import org.apache.drill.exec.planner.logical.DrillScanRel;
import org.apache.drill.exec.planner.physical.PlannerSettings;
import org.apache.drill.exec.store.dfs.FileSelection;
import org.apache.drill.exec.store.dfs.FormatSelection;
import org.apache.drill.exec.store.parquet.ParquetGroupScan;
import org.apache.drill.exec.vector.ValueVector;

import com.google.common.collect.Lists;

import java.io.IOException;
import java.util.BitSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * PartitionDescriptor that describes partitions based on column names instead of directory structure
 */
public class ParquetPartitionDescriptor extends AbstractPartitionDescriptor {

    private final List<SchemaPath> partitionColumns;
    private final DrillScanRel scanRel;

    public ParquetPartitionDescriptor(PlannerSettings settings, DrillScanRel scanRel) {
        ParquetGroupScan scan = (ParquetGroupScan) scanRel.getGroupScan();
        this.partitionColumns = scan.getPartitionColumns();
        this.scanRel = scanRel;
    }

    @Override
    public int getPartitionHierarchyIndex(String partitionName) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isPartitionName(String name) {
        return partitionColumns.contains(name);
    }

    @Override
    public Integer getIdIfValid(String name) {
        SchemaPath schemaPath = SchemaPath.getSimplePath(name);
        int id = partitionColumns.indexOf(schemaPath);
        if (id == -1) {
            return null;
        }
        return id;
    }

    @Override
    public int getMaxHierarchyLevel() {
        return partitionColumns.size();
    }

    private GroupScan createNewGroupScan(List<String> newFiles) throws IOException {
        final FileSelection newSelection = FileSelection.create(null, newFiles, getBaseTableLocation());
        final FileGroupScan newScan = ((FileGroupScan) scanRel.getGroupScan()).clone(newSelection);
        return newScan;
    }

    @Override
    public void populatePartitionVectors(ValueVector[] vectors, List<PartitionLocation> partitions,
            BitSet partitionColumnBitSet, Map<Integer, String> fieldNameMap) {
        int record = 0;
        for (PartitionLocation partitionLocation : partitions) {
            for (int partitionColumnIndex : BitSets.toIter(partitionColumnBitSet)) {
                SchemaPath column = SchemaPath.getSimplePath(fieldNameMap.get(partitionColumnIndex));
                ((ParquetGroupScan) scanRel.getGroupScan()).populatePruningVector(vectors[partitionColumnIndex],
                        record, column, partitionLocation.getEntirePartitionLocation());
            }
            record++;
        }

        for (ValueVector v : vectors) {
            if (v == null) {
                continue;
            }
            v.getMutator().setValueCount(partitions.size());
        }

    }

    @Override
    public TypeProtos.MajorType getVectorType(SchemaPath column, PlannerSettings plannerSettings) {
        return ((ParquetGroupScan) scanRel.getGroupScan()).getTypeForColumn(column);
    }

    private String getBaseTableLocation() {
        final FormatSelection origSelection = (FormatSelection) scanRel.getDrillTable().getSelection();
        return origSelection.getSelection().selectionRoot;
    }

    @Override
    protected void createPartitionSublists() {
        Set<String> fileLocations = ((ParquetGroupScan) scanRel.getGroupScan()).getFileSet();
        List<PartitionLocation> locations = new LinkedList<>();
        for (String file : fileLocations) {
            locations.add(new ParquetPartitionLocation(file));
        }
        locationSuperList = Lists.partition(locations, PartitionDescriptor.PARTITION_BATCH_SIZE);
        sublistsCreated = true;
    }

    @Override
    public TableScan createTableScan(List<PartitionLocation> newPartitionLocation) throws Exception {
        List<String> newFiles = Lists.newArrayList();
        for (final PartitionLocation location : newPartitionLocation) {
            newFiles.add(location.getEntirePartitionLocation());
        }

        final GroupScan newGroupScan = createNewGroupScan(newFiles);

        return new DrillScanRel(scanRel.getCluster(), scanRel.getTraitSet().plus(DrillRel.DRILL_LOGICAL),
                scanRel.getTable(), newGroupScan, scanRel.getRowType(), scanRel.getColumns(),
                true /*filter pushdown*/);
    }
}