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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.hadoop.hive.ql.exec;
import java.io.IOException;
import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.Warehouse;
import org.apache.hadoop.hive.metastore.api.BinaryColumnStatsData;
import org.apache.hadoop.hive.metastore.api.BooleanColumnStatsData;
import org.apache.hadoop.hive.metastore.api.ColumnStatistics;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsData;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsDesc;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsObj;
import org.apache.hadoop.hive.metastore.api.Date;
import org.apache.hadoop.hive.metastore.api.DateColumnStatsData;
import org.apache.hadoop.hive.metastore.api.Decimal;
import org.apache.hadoop.hive.metastore.api.DecimalColumnStatsData;
import org.apache.hadoop.hive.metastore.api.DoubleColumnStatsData;
import org.apache.hadoop.hive.metastore.api.LongColumnStatsData;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.StringColumnStatsData;
import org.apache.hadoop.hive.ql.DriverContext;
import org.apache.hadoop.hive.ql.QueryPlan;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.plan.ColumnStatsDesc;
import org.apache.hadoop.hive.ql.plan.ColumnStatsUpdateWork;
import org.apache.hadoop.hive.ql.plan.api.StageType;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.serde2.io.DateWritable;
/**
* ColumnStatsUpdateTask implementation. For example, ALTER TABLE src_stat
* UPDATE STATISTICS for column key SET ('numDVs'='1111','avgColLen'='1.111');
* For another example, ALTER TABLE src_stat_part PARTITION(partitionId=100)
* UPDATE STATISTICS for column value SET
* ('maxColLen'='4444','avgColLen'='44.4');
**/
public class ColumnStatsUpdateTask extends Task {
private static final long serialVersionUID = 1L;
private static transient final Log LOG = LogFactory
.getLog(ColumnStatsUpdateTask.class);
@Override
public void initialize(HiveConf conf, QueryPlan queryPlan, DriverContext ctx) {
super.initialize(conf, queryPlan, ctx);
}
private ColumnStatistics constructColumnStatsFromInput()
throws SemanticException, MetaException {
String dbName = SessionState.get().getCurrentDatabase();
ColumnStatsDesc desc = work.getColStats();
String tableName = desc.getTableName();
String partName = work.getPartName();
List colName = desc.getColName();
List colType = desc.getColType();
ColumnStatisticsObj statsObj = new ColumnStatisticsObj();
// grammar prohibits more than 1 column so we are guaranteed to have only 1
// element in this lists.
statsObj.setColName(colName.get(0));
statsObj.setColType(colType.get(0));
ColumnStatisticsData statsData = new ColumnStatisticsData();
String columnType = colType.get(0);
if (columnType.equalsIgnoreCase("long")) {
LongColumnStatsData longStats = new LongColumnStatsData();
longStats.setNumNullsIsSet(false);
longStats.setNumDVsIsSet(false);
longStats.setLowValueIsSet(false);
longStats.setHighValueIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
longStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numDVs")) {
longStats.setNumDVs(Long.parseLong(value));
} else if (fName.equals("lowValue")) {
longStats.setLowValue(Long.parseLong(value));
} else if (fName.equals("highValue")) {
longStats.setHighValue(Long.parseLong(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setLongStats(longStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("double")) {
DoubleColumnStatsData doubleStats = new DoubleColumnStatsData();
doubleStats.setNumNullsIsSet(false);
doubleStats.setNumDVsIsSet(false);
doubleStats.setLowValueIsSet(false);
doubleStats.setHighValueIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
doubleStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numDVs")) {
doubleStats.setNumDVs(Long.parseLong(value));
} else if (fName.equals("lowValue")) {
doubleStats.setLowValue(Double.parseDouble(value));
} else if (fName.equals("highValue")) {
doubleStats.setHighValue(Double.parseDouble(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setDoubleStats(doubleStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("string")) {
StringColumnStatsData stringStats = new StringColumnStatsData();
stringStats.setMaxColLenIsSet(false);
stringStats.setAvgColLenIsSet(false);
stringStats.setNumNullsIsSet(false);
stringStats.setNumDVsIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
stringStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numDVs")) {
stringStats.setNumDVs(Long.parseLong(value));
} else if (fName.equals("avgColLen")) {
stringStats.setAvgColLen(Double.parseDouble(value));
} else if (fName.equals("maxColLen")) {
stringStats.setMaxColLen(Long.parseLong(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setStringStats(stringStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("boolean")) {
BooleanColumnStatsData booleanStats = new BooleanColumnStatsData();
booleanStats.setNumNullsIsSet(false);
booleanStats.setNumTruesIsSet(false);
booleanStats.setNumFalsesIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
booleanStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numTrues")) {
booleanStats.setNumTrues(Long.parseLong(value));
} else if (fName.equals("numFalses")) {
booleanStats.setNumFalses(Long.parseLong(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setBooleanStats(booleanStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("binary")) {
BinaryColumnStatsData binaryStats = new BinaryColumnStatsData();
binaryStats.setNumNullsIsSet(false);
binaryStats.setAvgColLenIsSet(false);
binaryStats.setMaxColLenIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
binaryStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("avgColLen")) {
binaryStats.setAvgColLen(Double.parseDouble(value));
} else if (fName.equals("maxColLen")) {
binaryStats.setMaxColLen(Long.parseLong(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setBinaryStats(binaryStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("decimal")) {
DecimalColumnStatsData decimalStats = new DecimalColumnStatsData();
decimalStats.setNumNullsIsSet(false);
decimalStats.setNumDVsIsSet(false);
decimalStats.setLowValueIsSet(false);
decimalStats.setHighValueIsSet(false);
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
decimalStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numDVs")) {
decimalStats.setNumDVs(Long.parseLong(value));
} else if (fName.equals("lowValue")) {
BigDecimal d = new BigDecimal(value);
decimalStats.setLowValue(new Decimal(ByteBuffer.wrap(d
.unscaledValue().toByteArray()), (short) d.scale()));
} else if (fName.equals("highValue")) {
BigDecimal d = new BigDecimal(value);
decimalStats.setHighValue(new Decimal(ByteBuffer.wrap(d
.unscaledValue().toByteArray()), (short) d.scale()));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setDecimalStats(decimalStats);
statsObj.setStatsData(statsData);
} else if (columnType.equalsIgnoreCase("date")) {
DateColumnStatsData dateStats = new DateColumnStatsData();
Map mapProp = work.getMapProp();
for (Entry entry : mapProp.entrySet()) {
String fName = entry.getKey();
String value = entry.getValue();
if (fName.equals("numNulls")) {
dateStats.setNumNulls(Long.parseLong(value));
} else if (fName.equals("numDVs")) {
dateStats.setNumDVs(Long.parseLong(value));
} else if (fName.equals("lowValue")) {
// Date high/low value is stored as long in stats DB, but allow users to set high/low
// value using either date format (yyyy-mm-dd) or numeric format (days since epoch)
dateStats.setLowValue(readDateValue(value));
} else if (fName.equals("highValue")) {
dateStats.setHighValue(readDateValue(value));
} else {
throw new SemanticException("Unknown stat");
}
}
statsData.setDateStats(dateStats);
statsObj.setStatsData(statsData);
} else {
throw new SemanticException("Unsupported type");
}
String [] names = Utilities.getDbTableName(dbName, tableName);
ColumnStatisticsDesc statsDesc = getColumnStatsDesc(names[0], names[1],
partName, partName == null);
ColumnStatistics colStat = new ColumnStatistics();
colStat.setStatsDesc(statsDesc);
colStat.addToStatsObj(statsObj);
return colStat;
}
private ColumnStatisticsDesc getColumnStatsDesc(String dbName,
String tableName, String partName, boolean isTblLevel) {
ColumnStatisticsDesc statsDesc = new ColumnStatisticsDesc();
statsDesc.setDbName(dbName);
statsDesc.setTableName(tableName);
statsDesc.setIsTblLevel(isTblLevel);
if (!isTblLevel) {
statsDesc.setPartName(partName);
} else {
statsDesc.setPartName(null);
}
return statsDesc;
}
private int persistTableStats() throws HiveException, MetaException,
IOException {
// Construct a column statistics object from user input
ColumnStatistics colStats = constructColumnStatsFromInput();
// Persist the column statistics object to the metastore
db.updateTableColumnStatistics(colStats);
return 0;
}
private int persistPartitionStats() throws HiveException, MetaException,
IOException {
// Construct a column statistics object from user input
ColumnStatistics colStats = constructColumnStatsFromInput();
// Persist the column statistics object to the metastore
db.updatePartitionColumnStatistics(colStats);
return 0;
}
@Override
public int execute(DriverContext driverContext) {
try {
if (work.getColStats().isTblLevel()) {
return persistTableStats();
} else {
return persistPartitionStats();
}
} catch (Exception e) {
LOG.info(e);
}
return 1;
}
@Override
public StageType getType() {
return StageType.COLUMNSTATS;
}
@Override
public String getName() {
return "COLUMNSTATS UPDATE TASK";
}
private Date readDateValue(String dateStr) {
// try either yyyy-mm-dd, or integer representing days since epoch
try {
DateWritable writableVal = new DateWritable(java.sql.Date.valueOf(dateStr));
return new Date(writableVal.getDays());
} catch (IllegalArgumentException err) {
// Fallback to integer parsing
LOG.debug("Reading date value as days since epoch: " + dateStr);
return new Date(Long.parseLong(dateStr));
}
}
}
