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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.store.hive;
import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.ScanStats;
import org.apache.drill.exec.physical.base.SubScan;
import org.apache.drill.exec.store.StoragePluginRegistry;
import org.apache.drill.exec.store.hive.HiveTableWrapper.HivePartitionWrapper;
import java.io.IOException;
import java.util.List;
/**
* Extension of {@link HiveScan} which support reading Hive tables using Drill's native parquet reader.
*/
@JsonTypeName("hive-drill-native-parquet-scan")
public class HiveDrillNativeParquetScan extends HiveScan {
@JsonCreator
public HiveDrillNativeParquetScan(@JsonProperty("userName") String userName,
@JsonProperty("hiveReadEntry") HiveReadEntry hiveReadEntry,
@JsonProperty("hiveStoragePluginConfig") HiveStoragePluginConfig hiveStoragePluginConfig,
@JsonProperty("columns") List<SchemaPath> columns,
@JacksonInject StoragePluginRegistry pluginRegistry) throws ExecutionSetupException {
super(userName, hiveReadEntry, hiveStoragePluginConfig, columns, pluginRegistry);
}
public HiveDrillNativeParquetScan(String userName, HiveReadEntry hiveReadEntry, HiveStoragePlugin hiveStoragePlugin,
List<SchemaPath> columns, HiveMetadataProvider metadataProvider) throws ExecutionSetupException {
super(userName, hiveReadEntry, hiveStoragePlugin, columns, metadataProvider);
}
public HiveDrillNativeParquetScan(final HiveScan hiveScan) {
super(hiveScan);
}
@Override
public ScanStats getScanStats() {
final ScanStats nativeHiveScanStats = super.getScanStats();
// As Drill's native parquet record reader is faster and memory efficient. Divide the CPU cost
// by a factor to let the planner choose HiveDrillNativeScan over HiveScan with SerDes.
return new ScanStats(
nativeHiveScanStats.getGroupScanProperty(),
nativeHiveScanStats.getRecordCount(),
nativeHiveScanStats.getCpuCost()/getSerDeOverheadFactor(),
nativeHiveScanStats.getDiskCost());
}
@Override
public SubScan getSpecificScan(int minorFragmentId) throws ExecutionSetupException {
try {
return new HiveDrillNativeParquetSubScan((HiveSubScan)super.getSpecificScan(minorFragmentId));
} catch (IOException | ReflectiveOperationException e) {
throw new ExecutionSetupException(e);
}
}
@Override
public boolean isNativeReader() {
return true;
}
@Override
public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) throws ExecutionSetupException {
return new HiveDrillNativeParquetScan(this);
}
@Override
public HiveScan clone(HiveReadEntry hiveReadEntry) throws ExecutionSetupException {
return new HiveDrillNativeParquetScan(getUserName(), hiveReadEntry, getStoragePlugin(), getColumns(), getMetadataProvider());
}
@Override
public GroupScan clone(List<SchemaPath> columns) {
final HiveDrillNativeParquetScan scan = new HiveDrillNativeParquetScan(this);
scan.columns = columns;
return scan;
}
@Override
public String toString() {
final List<HivePartitionWrapper> partitions = getHiveReadEntry().getHivePartitionWrappers();
int numPartitions = partitions == null ? 0 : partitions.size();
return "HiveDrillNativeParquetScan [table=" + getHiveReadEntry().getHiveTableWrapper()
+ ", columns=" + getColumns()
+ ", numPartitions=" + numPartitions
+ ", partitions= " + partitions
+ ", inputDirectories=" + getMetadataProvider().getInputDirectories(getHiveReadEntry()) + "]";
}
}
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