org.apache.drill.exec.store.hive.HiveSubScan.java Source code

Introduction

Here is the source code for org.apache.drill.exec.store.hive.HiveSubScan.java

Source

/**
 * 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.store.hive;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.codec.binary.Base64;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.AbstractBase;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.PhysicalVisitor;
import org.apache.drill.exec.physical.base.SubScan;
import org.apache.drill.exec.proto.UserBitShared.CoreOperatorType;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.Table;
import org.apache.hadoop.mapred.InputSplit;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import com.google.common.io.ByteArrayDataInput;
import com.google.common.io.ByteStreams;

@JsonTypeName("hive-sub-scan")
public class HiveSubScan extends AbstractBase implements SubScan {

    private List<String> splits;

    private HiveReadEntry hiveReadEntry;

    private List<String> splitClasses;

    private List<SchemaPath> columns;

    @JsonIgnore
    private List<InputSplit> inputSplits = Lists.newArrayList();
    @JsonIgnore
    private Table table;
    @JsonIgnore
    private List<Partition> partitions;

    @JsonCreator
    public HiveSubScan(@JsonProperty("userName") String userName, @JsonProperty("splits") List<String> splits,
            @JsonProperty("hiveReadEntry") HiveReadEntry hiveReadEntry,
            @JsonProperty("splitClasses") List<String> splitClasses,
            @JsonProperty("columns") List<SchemaPath> columns) throws IOException, ReflectiveOperationException {
        super(userName);
        this.hiveReadEntry = hiveReadEntry;
        this.table = hiveReadEntry.getTable();
        this.partitions = hiveReadEntry.getPartitions();
        this.splits = splits;
        this.splitClasses = splitClasses;
        this.columns = columns;

        for (int i = 0; i < splits.size(); i++) {
            inputSplits.add(deserializeInputSplit(splits.get(i), splitClasses.get(i)));
        }
    }

    public List<String> getSplits() {
        return splits;
    }

    public Table getTable() {
        return table;
    }

    public List<Partition> getPartitions() {
        return partitions;
    }

    public List<String> getSplitClasses() {
        return splitClasses;
    }

    public List<SchemaPath> getColumns() {
        return columns;
    }

    public List<InputSplit> getInputSplits() {
        return inputSplits;
    }

    public HiveReadEntry getHiveReadEntry() {
        return hiveReadEntry;
    }

    public static InputSplit deserializeInputSplit(String base64, String className)
            throws IOException, ReflectiveOperationException {
        Constructor<?> constructor = Class.forName(className).getDeclaredConstructor();
        if (constructor == null) {
            throw new ReflectiveOperationException(
                    "Class " + className + " does not implement a default constructor.");
        }
        constructor.setAccessible(true);
        InputSplit split = (InputSplit) constructor.newInstance();
        ByteArrayDataInput byteArrayDataInput = ByteStreams.newDataInput(Base64.decodeBase64(base64));
        split.readFields(byteArrayDataInput);
        return split;
    }

    @Override
    public <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E {
        return physicalVisitor.visitSubScan(this, value);
    }

    @Override
    public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) throws ExecutionSetupException {
        try {
            return new HiveSubScan(getUserName(), splits, hiveReadEntry, splitClasses, columns);
        } catch (IOException | ReflectiveOperationException e) {
            throw new ExecutionSetupException(e);
        }
    }

    @Override
    public Iterator<PhysicalOperator> iterator() {
        return Iterators.emptyIterator();
    }

    @Override
    public int getOperatorType() {
        return CoreOperatorType.HIVE_SUB_SCAN_VALUE;
    }
}