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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.logical;
import java.io.IOException;
import org.apache.calcite.config.CalciteConnectionConfig;
import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.schema.Schema.TableType;
import org.apache.calcite.schema.Statistic;
import org.apache.calcite.schema.Statistics;
import org.apache.calcite.schema.Table;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlNode;
import org.apache.drill.common.JSONOptions;
import org.apache.drill.common.logical.StoragePluginConfig;
import org.apache.drill.exec.planner.common.DrillStatsTable;
import org.apache.drill.exec.physical.base.SchemalessScan;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.server.options.SessionOptionManager;
import org.apache.drill.exec.store.StoragePlugin;
import org.apache.drill.exec.store.dfs.FileSelection;
import org.apache.drill.exec.util.ImpersonationUtil;
public abstract class DrillTable implements Table {
private final String storageEngineName;
private final StoragePluginConfig storageEngineConfig;
private final TableType tableType;
private final Object selection;
private final StoragePlugin plugin;
private final String userName;
private GroupScan scan;
private SessionOptionManager options;
// Stores the statistics(rowcount, NDV etc.) associated with the table
private DrillStatsTable statsTable;
/**
* Creates a DrillTable instance for a @{code TableType#Table} table.
* @param storageEngineName StorageEngine name.
* @param plugin Reference to StoragePlugin.
* @param userName Whom to impersonate while reading the contents of the table.
* @param selection Table contents (type and contents depend on type of StoragePlugin).
*/
public DrillTable(String storageEngineName, StoragePlugin plugin, String userName, Object selection) {
this(storageEngineName, plugin, TableType.TABLE, userName, selection);
}
/**
* Creates a DrillTable instance.
* @param storageEngineName StorageEngine name.
* @param plugin Reference to StoragePlugin.
* @param tableType the JDBC table type
* @param userName Whom to impersonate while reading the contents of the table.
* @param selection Table contents (type and contents depend on type of StoragePlugin).
*/
public DrillTable(String storageEngineName, StoragePlugin plugin, TableType tableType, String userName, Object selection) {
this.selection = selection;
this.plugin = plugin;
this.tableType = tableType;
this.storageEngineConfig = plugin.getConfig();
this.storageEngineName = storageEngineName;
this.userName = userName;
}
/**
* TODO: Same purpose as other constructor except the impersonation user is the user who is running the Drillbit
* process. Once we add impersonation to non-FileSystem storage plugins such as Hive, HBase etc,
* we can remove this constructor.
*/
public DrillTable(String storageEngineName, StoragePlugin plugin, Object selection) {
this(storageEngineName, plugin, ImpersonationUtil.getProcessUserName(), selection);
}
public void setOptions(SessionOptionManager options) {
this.options = options;
}
public void setGroupScan(GroupScan scan) {
this.scan = scan;
}
public GroupScan getGroupScan() throws IOException{
if (scan == null) {
if (selection instanceof FileSelection && ((FileSelection) selection).isEmptyDirectory()) {
this.scan = new SchemalessScan(userName, ((FileSelection) selection).getSelectionRoot());
} else {
this.scan = plugin.getPhysicalScan(userName, new JSONOptions(selection), options);
}
}
return scan;
}
public StoragePluginConfig getStorageEngineConfig() {
return storageEngineConfig;
}
public StoragePlugin getPlugin() {
return plugin;
}
public Object getSelection() {
return selection;
}
public String getStorageEngineName() {
return storageEngineName;
}
public String getUserName() {
return userName;
}
@Override
public Statistic getStatistic() {
return Statistics.UNKNOWN;
}
public DrillStatsTable getStatsTable() {
return statsTable;
}
public void setStatsTable(DrillStatsTable statsTable) {
this.statsTable = statsTable;
}
public RelNode toRel(RelOptTable.ToRelContext context, RelOptTable table) {
return new DrillScanRel(context.getCluster(),
context.getCluster().traitSetOf(DrillRel.DRILL_LOGICAL),
table);
}
@Override
public TableType getJdbcTableType() {
return tableType;
}
@Override
public boolean rolledUpColumnValidInsideAgg(String column,
SqlCall call, SqlNode parent, CalciteConnectionConfig config) {
return true;
}
@Override
public boolean isRolledUp(String column) {
return false;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((selection == null) ? 0 : selection.hashCode());
result = prime * result + ((storageEngineConfig == null) ? 0 : storageEngineConfig.hashCode());
result = prime * result + ((storageEngineName == null) ? 0 : storageEngineName.hashCode());
result = prime * result + ((userName == null) ? 0 : userName.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
DrillTable other = (DrillTable) obj;
if (selection == null) {
if (other.selection != null) {
return false;
}
} else if (!selection.equals(other.selection)) {
return false;
}
if (storageEngineConfig == null) {
if (other.storageEngineConfig != null) {
return false;
}
} else if (!storageEngineConfig.equals(other.storageEngineConfig)) {
return false;
}
if (storageEngineName == null) {
if (other.storageEngineName != null) {
return false;
}
} else if (!storageEngineName.equals(other.storageEngineName)) {
return false;
}
if (userName == null) {
if (other.userName != null) {
return false;
}
} else if (!userName.equals(other.userName)) {
return false;
}
return true;
}
}
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