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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.udf.generic;
import java.io.Closeable;
import java.io.IOException;
import java.sql.Timestamp;
import java.text.ParseException;
import java.util.Date;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.MapredContext;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.UDFType;
import org.apache.hadoop.hive.serde2.io.ByteWritable;
import org.apache.hadoop.hive.serde2.io.DateWritable;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.ShortWritable;
import org.apache.hadoop.hive.serde2.io.TimestampWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils;
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.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hive.common.util.DateUtils;
/**
* A Generic User-defined function (GenericUDF) for the use with Hive.
*
* New GenericUDF classes need to inherit from this GenericUDF class.
*
* The GenericUDF are superior to normal UDFs in the following ways: 1. It can
* accept arguments of complex types, and return complex types. 2. It can accept
* variable length of arguments. 3. It can accept an infinite number of function
* signature - for example, it's easy to write a GenericUDF that accepts
* array, array> and so on (arbitrary levels of nesting). 4. It
* can do short-circuit evaluations using DeferedObject.
*/
@UDFType(deterministic = true)
public abstract class GenericUDF implements Closeable {
private static final String[] ORDINAL_SUFFIXES = new String[] { "th", "st", "nd", "rd", "th",
"th", "th", "th", "th", "th" };
/**
* A Defered Object allows us to do lazy-evaluation and short-circuiting.
* GenericUDF use DeferedObject to pass arguments.
*/
public static interface DeferredObject {
void prepare(int version) throws HiveException;
Object get() throws HiveException;
};
/**
* A basic dummy implementation of DeferredObject which just stores a Java
* Object reference.
*/
public static class DeferredJavaObject implements DeferredObject {
private final Object value;
public DeferredJavaObject(Object value) {
this.value = value;
}
@Override
public void prepare(int version) throws HiveException {
}
@Override
public Object get() throws HiveException {
return value;
}
}
/**
* The constructor.
*/
public GenericUDF() {
}
/**
* Initialize this GenericUDF. This will be called once and only once per
* GenericUDF instance.
*
* @param arguments
* The ObjectInspector for the arguments
* @throws UDFArgumentException
* Thrown when arguments have wrong types, wrong length, etc.
* @return The ObjectInspector for the return value
*/
public abstract ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentException;
/**
* Additionally setup GenericUDF with MapredContext before initializing.
* This is only called in runtime of MapRedTask.
*
* @param context context
*/
public void configure(MapredContext context) {
}
/**
* Initialize this GenericUDF. Additionally, if the arguments are constant
* and the function is eligible to be folded, then the constant value
* returned by this UDF will be computed and stored in the
* ConstantObjectInspector returned. Otherwise, the function behaves exactly
* like initialize().
*/
public ObjectInspector initializeAndFoldConstants(ObjectInspector[] arguments)
throws UDFArgumentException {
ObjectInspector oi = initialize(arguments);
// If the UDF depends on any external resources, we can't fold because the
// resources may not be available at compile time.
if (getRequiredFiles() != null ||
getRequiredJars() != null) {
return oi;
}
boolean allConstant = true;
for (int ii = 0; ii < arguments.length; ++ii) {
if (!ObjectInspectorUtils.isConstantObjectInspector(arguments[ii])) {
allConstant = false;
break;
}
}
if (allConstant &&
!ObjectInspectorUtils.isConstantObjectInspector(oi) &&
FunctionRegistry.isDeterministic(this) &&
!FunctionRegistry.isStateful(this) &&
ObjectInspectorUtils.supportsConstantObjectInspector(oi)) {
DeferredObject[] argumentValues =
new DeferredJavaObject[arguments.length];
for (int ii = 0; ii < arguments.length; ++ii) {
argumentValues[ii] = new DeferredJavaObject(
((ConstantObjectInspector)arguments[ii]).getWritableConstantValue());
}
try {
Object constantValue = evaluate(argumentValues);
oi = ObjectInspectorUtils.getConstantObjectInspector(oi, constantValue);
} catch (HiveException e) {
throw new UDFArgumentException(e);
}
}
return oi;
}
/**
* The following two functions can be overridden to automatically include
* additional resources required by this UDF. The return types should be
* arrays of paths.
*/
public String[] getRequiredJars() {
return null;
}
public String[] getRequiredFiles() {
return null;
}
/**
* Evaluate the GenericUDF with the arguments.
*
* @param arguments
* The arguments as DeferedObject, use DeferedObject.get() to get the
* actual argument Object. The Objects can be inspected by the
* ObjectInspectors passed in the initialize call.
* @return The
*/
public abstract Object evaluate(DeferredObject[] arguments)
throws HiveException;
/**
* Get the String to be displayed in explain.
*/
public abstract String getDisplayString(String[] children);
/**
* Close GenericUDF.
* This is only called in runtime of MapRedTask.
*/
@Override
public void close() throws IOException {
}
/**
* Some functions are affected by appearing order of arguments (comparisons, for example)
*/
public GenericUDF flip() {
return this;
}
public String getUdfName() {
return getClass().getName();
}
/**
* Some information may be set during initialize() which needs to be saved when the UDF is copied.
* This will be called by FunctionRegistry.cloneGenericUDF()
*/
public void copyToNewInstance(Object newInstance) throws UDFArgumentException {
// newInstance should always be the same type of object as this
if (this.getClass() != newInstance.getClass()) {
throw new UDFArgumentException("Invalid copy between " + this.getClass().getName()
+ " and " + newInstance.getClass().getName());
}
}
protected String getStandardDisplayString(String name, String[] children) {
return getStandardDisplayString(name, children, ", ");
}
protected String getStandardDisplayString(String name, String[] children, String delim) {
StringBuilder sb = new StringBuilder();
sb.append(name);
sb.append("(");
if (children.length > 0) {
sb.append(children[0]);
for (int i = 1; i < children.length; i++) {
sb.append(delim);
sb.append(children[i]);
}
}
sb.append(")");
return sb.toString();
}
protected String getFuncName() {
return getClass().getSimpleName().substring(10).toLowerCase();
}
protected void checkArgsSize(ObjectInspector[] arguments, int min, int max)
throws UDFArgumentLengthException {
if (arguments.length < min || arguments.length > max) {
StringBuilder sb = new StringBuilder();
sb.append(getFuncName());
sb.append(" requires ");
if (min == max) {
sb.append(min);
} else {
sb.append(min).append("..").append(max);
}
sb.append(" argument(s), got ");
sb.append(arguments.length);
throw new UDFArgumentLengthException(sb.toString());
}
}
protected void checkArgPrimitive(ObjectInspector[] arguments, int i)
throws UDFArgumentTypeException {
ObjectInspector.Category oiCat = arguments[i].getCategory();
if (oiCat != ObjectInspector.Category.PRIMITIVE) {
throw new UDFArgumentTypeException(i, getFuncName() + " only takes primitive types as "
+ getArgOrder(i) + " argument, got " + oiCat);
}
}
protected void checkArgGroups(ObjectInspector[] arguments, int i, PrimitiveCategory[] inputTypes,
PrimitiveGrouping... grps) throws UDFArgumentTypeException {
PrimitiveCategory inputType = ((PrimitiveObjectInspector) arguments[i]).getPrimitiveCategory();
for (PrimitiveGrouping grp : grps) {
if (PrimitiveObjectInspectorUtils.getPrimitiveGrouping(inputType) == grp) {
inputTypes[i] = inputType;
return;
}
}
// build error message
StringBuilder sb = new StringBuilder();
sb.append(getFuncName());
sb.append(" only takes ");
sb.append(grps[0]);
for (int j = 1; j < grps.length; j++) {
sb.append(", ");
sb.append(grps[j]);
}
sb.append(" types as ");
sb.append(getArgOrder(i));
sb.append(" argument, got ");
sb.append(inputType);
throw new UDFArgumentTypeException(i, sb.toString());
}
protected void obtainStringConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
Converter converter = ObjectInspectorConverters.getConverter(
arguments[i],
PrimitiveObjectInspectorFactory.writableStringObjectInspector);
converters[i] = converter;
inputTypes[i] = inputType;
}
protected void obtainIntConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
switch (inputType) {
case BYTE:
case SHORT:
case INT:
case VOID:
break;
default:
throw new UDFArgumentTypeException(i, getFuncName() + " only takes INT/SHORT/BYTE types as "
+ getArgOrder(i) + " argument, got " + inputType);
}
Converter converter = ObjectInspectorConverters.getConverter(
arguments[i],
PrimitiveObjectInspectorFactory.writableIntObjectInspector);
converters[i] = converter;
inputTypes[i] = inputType;
}
protected void obtainLongConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
switch (inputType) {
case BYTE:
case SHORT:
case INT:
case LONG:
break;
default:
throw new UDFArgumentTypeException(i, getFuncName()
+ " only takes LONG/INT/SHORT/BYTE types as " + getArgOrder(i) + " argument, got "
+ inputType);
}
Converter converter = ObjectInspectorConverters.getConverter(
arguments[i],
PrimitiveObjectInspectorFactory.writableIntObjectInspector);
converters[i] = converter;
inputTypes[i] = inputType;
}
protected void obtainDoubleConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
Converter converter = ObjectInspectorConverters.getConverter(
arguments[i],
PrimitiveObjectInspectorFactory.writableDoubleObjectInspector);
converters[i] = converter;
inputTypes[i] = inputType;
}
protected void obtainDateConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
ObjectInspector outOi;
switch (inputType) {
case STRING:
case VARCHAR:
case CHAR:
outOi = PrimitiveObjectInspectorFactory.writableStringObjectInspector;
break;
case TIMESTAMP:
case DATE:
case VOID:
outOi = PrimitiveObjectInspectorFactory.writableDateObjectInspector;
break;
default:
throw new UDFArgumentTypeException(i, getFuncName()
+ " only takes STRING_GROUP or DATE_GROUP types as " + getArgOrder(i) + " argument, got "
+ inputType);
}
converters[i] = ObjectInspectorConverters.getConverter(inOi, outOi);
inputTypes[i] = inputType;
}
protected void obtainTimestampConverter(ObjectInspector[] arguments, int i,
PrimitiveCategory[] inputTypes, Converter[] converters) throws UDFArgumentTypeException {
PrimitiveObjectInspector inOi = (PrimitiveObjectInspector) arguments[i];
PrimitiveCategory inputType = inOi.getPrimitiveCategory();
ObjectInspector outOi;
switch (inputType) {
case STRING:
case VARCHAR:
case CHAR:
case TIMESTAMP:
case DATE:
break;
default:
throw new UDFArgumentTypeException(i, getFuncName()
+ " only takes STRING_GROUP or DATE_GROUP types as " + getArgOrder(i) + " argument, got "
+ inputType);
}
outOi = PrimitiveObjectInspectorFactory.writableTimestampObjectInspector;
converters[i] = ObjectInspectorConverters.getConverter(inOi, outOi);
inputTypes[i] = inputType;
}
protected String getStringValue(DeferredObject[] arguments, int i, Converter[] converters)
throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
return converters[i].convert(obj).toString();
}
protected Integer getIntValue(DeferredObject[] arguments, int i, Converter[] converters)
throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
Object writableValue = converters[i].convert(obj);
int v = ((IntWritable) writableValue).get();
return v;
}
protected Long getLongValue(DeferredObject[] arguments, int i, Converter[] converters)
throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
Object writableValue = converters[i].convert(obj);
long v = ((LongWritable) writableValue).get();
return v;
}
protected Double getDoubleValue(DeferredObject[] arguments, int i, Converter[] converters)
throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
Object writableValue = converters[i].convert(obj);
double v = ((DoubleWritable) writableValue).get();
return v;
}
protected Date getDateValue(DeferredObject[] arguments, int i, PrimitiveCategory[] inputTypes,
Converter[] converters) throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
Date date;
switch (inputTypes[i]) {
case STRING:
case VARCHAR:
case CHAR:
String dateStr = converters[i].convert(obj).toString();
try {
date = DateUtils.getDateFormat().parse(dateStr);
} catch (ParseException e) {
return null;
}
break;
case TIMESTAMP:
case DATE:
Object writableValue = converters[i].convert(obj);
date = ((DateWritable) writableValue).get();
break;
default:
throw new UDFArgumentTypeException(0, getFuncName()
+ " only takes STRING_GROUP and DATE_GROUP types, got " + inputTypes[i]);
}
return date;
}
protected Timestamp getTimestampValue(DeferredObject[] arguments, int i, Converter[] converters)
throws HiveException {
Object obj;
if ((obj = arguments[i].get()) == null) {
return null;
}
Object writableValue = converters[i].convert(obj);
// if string can not be parsed converter will return null
if (writableValue == null) {
return null;
}
Timestamp ts = ((TimestampWritable) writableValue).getTimestamp();
return ts;
}
protected String getConstantStringValue(ObjectInspector[] arguments, int i) {
Object constValue = ((ConstantObjectInspector) arguments[i]).getWritableConstantValue();
String str = constValue == null ? null : constValue.toString();
return str;
}
protected Integer getConstantIntValue(ObjectInspector[] arguments, int i)
throws UDFArgumentTypeException {
Object constValue = ((ConstantObjectInspector) arguments[i]).getWritableConstantValue();
if (constValue == null) {
return null;
}
int v;
if (constValue instanceof IntWritable) {
v = ((IntWritable) constValue).get();
} else if (constValue instanceof ShortWritable) {
v = ((ShortWritable) constValue).get();
} else if (constValue instanceof ByteWritable) {
v = ((ByteWritable) constValue).get();
} else {
throw new UDFArgumentTypeException(i, getFuncName() + " only takes INT/SHORT/BYTE types as "
+ getArgOrder(i) + " argument, got " + constValue.getClass());
}
return v;
}
protected Long getConstantLongValue(ObjectInspector[] arguments, int i)
throws UDFArgumentTypeException {
Object constValue = ((ConstantObjectInspector) arguments[i]).getWritableConstantValue();
if (constValue == null) {
return null;
}
long v;
if (constValue instanceof IntWritable) {
v = ((LongWritable) constValue).get();
} else if (constValue instanceof IntWritable) {
v = ((IntWritable) constValue).get();
} else if (constValue instanceof ShortWritable) {
v = ((ShortWritable) constValue).get();
} else if (constValue instanceof ByteWritable) {
v = ((ByteWritable) constValue).get();
} else {
throw new UDFArgumentTypeException(i, getFuncName()
+ " only takes LONG/INT/SHORT/BYTE types as " + getArgOrder(i) + " argument, got "
+ constValue.getClass());
}
return v;
}
protected String getArgOrder(int i) {
i++;
switch (i % 100) {
case 11:
case 12:
case 13:
return i + "th";
default:
return i + ORDINAL_SUFFIXES[i % 10];
}
}
}
