/**
* 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.udf.generic;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.NoMatchingMethodException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.serde2.io.ByteWritable;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.serde2.io.ShortWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils.PrimitiveGrouping;
import org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hive.common.HiveCompat;
import org.apache.hive.common.HiveCompat.CompatLevel;
/**
* GenericUDF Base Class for operations.
*/
@Description(name = "op", value = "a op b - Returns the result of operation")
public abstract class GenericUDFBaseNumeric extends GenericUDF {
protected String opName;
protected String opDisplayName;
protected transient PrimitiveObjectInspector leftOI;
protected transient PrimitiveObjectInspector rightOI;
protected transient PrimitiveObjectInspector resultOI;
protected transient Converter converterLeft;
protected transient Converter converterRight;
protected ByteWritable byteWritable = new ByteWritable();
protected ShortWritable shortWritable = new ShortWritable();
protected IntWritable intWritable = new IntWritable();
protected LongWritable longWritable = new LongWritable();
protected FloatWritable floatWritable = new FloatWritable();
protected DoubleWritable doubleWritable = new DoubleWritable();
protected HiveDecimalWritable decimalWritable = new HiveDecimalWritable();
protected boolean confLookupNeeded = true;
protected boolean ansiSqlArithmetic = false;
public GenericUDFBaseNumeric() {
opName = getClass().getSimpleName();
}
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
if (arguments.length != 2) {
throw new UDFArgumentException(opName + " requires two arguments.");
}
for (int i = 0; i < 2; i++) {
Category category = arguments[i].getCategory();
if (category != Category.PRIMITIVE) {
throw new UDFArgumentTypeException(i, "The "
+ GenericUDFUtils.getOrdinal(i + 1)
+ " argument of " + opName + " is expected to a "
+ Category.PRIMITIVE.toString().toLowerCase() + " type, but "
+ category.toString().toLowerCase() + " is found");
}
}
// During map/reduce tasks, there may not be a valid HiveConf from the SessionState.
// So lookup and save any needed conf information during query compilation in the Hive conf
// (where there should be valid HiveConf from SessionState). Plan serialization will ensure
// we have access to these values in the map/reduce tasks.
if (confLookupNeeded) {
CompatLevel compatLevel = HiveCompat.getCompatLevel(SessionState.get().getConf());
ansiSqlArithmetic = compatLevel.ordinal() > CompatLevel.HIVE_0_12.ordinal();
confLookupNeeded = false;
}
leftOI = (PrimitiveObjectInspector) arguments[0];
rightOI = (PrimitiveObjectInspector) arguments[1];
resultOI = PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(
deriveResultTypeInfo());
converterLeft = ObjectInspectorConverters.getConverter(leftOI, resultOI);
converterRight = ObjectInspectorConverters.getConverter(rightOI, resultOI);
return resultOI;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
if (arguments[0] == null || arguments[1] == null) {
return null;
}
Object left = arguments[0].get();
Object right = arguments[1].get();
if (left == null && right == null) {
return null;
}
// Handle decimal separately.
if (resultOI.getPrimitiveCategory() == PrimitiveCategory.DECIMAL) {
HiveDecimal hdLeft = PrimitiveObjectInspectorUtils.getHiveDecimal(left, leftOI);
HiveDecimal hdRight = PrimitiveObjectInspectorUtils.getHiveDecimal(right, rightOI);
if (hdLeft == null || hdRight == null) {
return null;
}
HiveDecimalWritable result = evaluate(hdLeft, hdRight);
return resultOI.getPrimitiveWritableObject(result);
}
left = converterLeft.convert(left);
if (left == null) {
return null;
}
right = converterRight.convert(right);
if (right == null) {
return null;
}
switch (resultOI.getPrimitiveCategory()) {
case BYTE:
return evaluate((ByteWritable) left, (ByteWritable) right);
case SHORT:
return evaluate((ShortWritable) left, (ShortWritable) right);
case INT:
return evaluate((IntWritable) left, (IntWritable) right);
case LONG:
return evaluate((LongWritable) left, (LongWritable) right);
case FLOAT:
return evaluate((FloatWritable) left, (FloatWritable) right);
case DOUBLE:
return evaluate((DoubleWritable) left, (DoubleWritable) right);
default:
// Should never happen.
throw new RuntimeException("Unexpected type in evaluating " + opName + ": " +
resultOI.getPrimitiveCategory());
}
}
protected ByteWritable evaluate(ByteWritable left, ByteWritable right) {
return null;
}
protected ShortWritable evaluate(ShortWritable left, ShortWritable right) {
return null;
}
protected IntWritable evaluate(IntWritable left, IntWritable right) {
return null;
}
protected LongWritable evaluate(LongWritable left, LongWritable right) {
return null;
}
protected FloatWritable evaluate(FloatWritable left, FloatWritable right) {
return null;
}
protected DoubleWritable evaluate(DoubleWritable left, DoubleWritable right) {
return null;
}
protected HiveDecimalWritable evaluate(HiveDecimal left, HiveDecimal right) {
return null;
}
/**
* Default implementation for deriving typeinfo instance for the operator result.
*
* @param leftOI TypeInfo instance of the left operand
* @param rightOI TypeInfo instance of the right operand
* @return
* @throws UDFArgumentException
*/
private PrimitiveTypeInfo deriveResultTypeInfo() throws UDFArgumentException {
PrimitiveTypeInfo left = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(leftOI);
PrimitiveTypeInfo right = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(rightOI);
if (!FunctionRegistry.isNumericType(left) || !FunctionRegistry.isNumericType(right)) {
List<TypeInfo> argTypeInfos = new ArrayList<TypeInfo>(2);
argTypeInfos.add(left);
argTypeInfos.add(right);
throw new NoMatchingMethodException(this.getClass(), argTypeInfos, null);
}
// If any of the type isn't exact, double is chosen.
if (!FunctionRegistry.isExactNumericType(left) || !FunctionRegistry.isExactNumericType(right)) {
return deriveResultApproxTypeInfo();
}
return deriveResultExactTypeInfo();
}
/**
* Default implementation for getting the approximate type info for the operator result.
* Divide operator overrides this.
* @return
*/
protected PrimitiveTypeInfo deriveResultApproxTypeInfo() {
PrimitiveTypeInfo left = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(leftOI);
PrimitiveTypeInfo right = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(rightOI);
// string types get converted to double
if (PrimitiveObjectInspectorUtils.getPrimitiveGrouping(left.getPrimitiveCategory())
== PrimitiveGrouping.STRING_GROUP) {
left = TypeInfoFactory.doubleTypeInfo;
}
if (PrimitiveObjectInspectorUtils.getPrimitiveGrouping(right.getPrimitiveCategory())
== PrimitiveGrouping.STRING_GROUP) {
right = TypeInfoFactory.doubleTypeInfo;
}
// Use type promotion
PrimitiveCategory commonCat = FunctionRegistry.getCommonCategory(left, right);
if (commonCat == PrimitiveCategory.DECIMAL) {
// Hive 0.12 behavior where double * decimal -> decimal is gone.
return TypeInfoFactory.doubleTypeInfo;
} else if (commonCat == null) {
return TypeInfoFactory.doubleTypeInfo;
} else {
return left.getPrimitiveCategory() == commonCat ? left : right;
}
}
/**
* Default implementation for getting the exact type info for the operator result. It worked for all
* but divide operator.
*
* @return
*/
protected PrimitiveTypeInfo deriveResultExactTypeInfo() {
PrimitiveTypeInfo left = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(leftOI);
PrimitiveTypeInfo right = (PrimitiveTypeInfo) TypeInfoUtils.getTypeInfoFromObjectInspector(rightOI);
// Now we are handling exact types. Base implementation handles type promotion.
PrimitiveCategory commonCat = FunctionRegistry.getCommonCategory(left, right);
if (commonCat == PrimitiveCategory.DECIMAL) {
return deriveResultDecimalTypeInfo();
} else {
return left.getPrimitiveCategory() == commonCat ? left : right;
}
}
/**
* Derive the object inspector instance for the decimal result of the operator.
*/
protected DecimalTypeInfo deriveResultDecimalTypeInfo() {
int prec1 = leftOI.precision();
int prec2 = rightOI.precision();
int scale1 = leftOI.scale();
int scale2 = rightOI.scale();
return deriveResultDecimalTypeInfo(prec1, scale1, prec2, scale2);
}
protected abstract DecimalTypeInfo deriveResultDecimalTypeInfo(int prec1, int scale1, int prec2, int scale2);
@Override
public String getDisplayString(String[] children) {
assert (children.length == 2);
return "(" + children[0] + " " + opDisplayName + " " + children[1] + ")";
}
public void copyToNewInstance(Object newInstance) throws UDFArgumentException {
super.copyToNewInstance(newInstance);
GenericUDFBaseNumeric other = (GenericUDFBaseNumeric) newInstance;
other.confLookupNeeded = this.confLookupNeeded;
other.ansiSqlArithmetic = this.ansiSqlArithmetic;
}
}