/**
* 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.expr.fn;
import com.sun.codemodel.JBlock;
import com.sun.codemodel.JCatchBlock;
import com.sun.codemodel.JClass;
import com.sun.codemodel.JCodeModel;
import com.sun.codemodel.JConditional;
import com.sun.codemodel.JExpr;
import com.sun.codemodel.JInvocation;
import com.sun.codemodel.JTryBlock;
import com.sun.codemodel.JVar;
import org.apache.drill.common.expression.ExpressionPosition;
import org.apache.drill.common.expression.FunctionHolderExpression;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.types.TypeProtos;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.expr.ClassGenerator;
import org.apache.drill.exec.expr.ClassGenerator.HoldingContainer;
import org.apache.drill.exec.expr.HiveFuncHolderExpr;
import org.apache.drill.exec.expr.TypeHelper;
import org.apache.drill.exec.expr.fn.impl.hive.DrillDeferredObject;
import org.apache.drill.exec.expr.fn.impl.hive.ObjectInspectorHelper;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFBridge;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import java.util.List;
public class HiveFuncHolder extends AbstractFuncHolder {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(FunctionImplementationRegistry.class);
private MajorType[] argTypes;
private ObjectInspector returnOI;
private MajorType returnType;
private Class<? extends GenericUDF> genericUdfClazz;
private boolean isGenericUDF = true;
private Class<? extends UDF> udfClazz = null;
private String udfName = "";
private boolean isRandom;
/**
* Create holder for GenericUDF
* @param genericUdfClazz implementation class
* @param argTypes
* @param returnOI
* @param returnType
*/
public HiveFuncHolder(Class<? extends GenericUDF> genericUdfClazz, MajorType[] argTypes,
ObjectInspector returnOI, MajorType returnType, boolean isRandom) {
this.genericUdfClazz = genericUdfClazz;
this.argTypes = argTypes;
this.returnOI = returnOI;
this.returnType = returnType;
this.isRandom = isRandom;
}
/**
* Create holder for UDF
* @param udfName name of the UDF class
* @param udfClazz UDF implementation class
* @param argTypes
* @param returnOI
* @param returnType
*/
public HiveFuncHolder(String udfName, Class< ? extends UDF> udfClazz, MajorType[] argTypes,
ObjectInspector returnOI, MajorType returnType, boolean isRandom) {
this(GenericUDFBridge.class, argTypes, returnOI, returnType, isRandom);
this.isGenericUDF = false;
this.udfClazz = udfClazz;
this.udfName = udfName;
}
/**
* UDF return type
*/
public MajorType getReturnType() {
return returnType;
}
/**
* Aggregate function
*/
public boolean isAggregating() {
// currently only simple UDFS are supported
return false;
}
/**
* is the function non-deterministic?
*/
public boolean isRandom() {
return isRandom;
}
@Override
public MajorType getParmMajorType(int i) {
return argTypes[i];
}
@Override
public int getParamCount() {
return argTypes.length;
}
/**
* Start generating code
* @return workspace variables
*/
@Override
public JVar[] renderStart(ClassGenerator<?> g, HoldingContainer[] inputVariables){
JVar[] workspaceJVars = new JVar[5];
workspaceJVars[0] = g.declareClassField("returnOI", g.getModel()._ref(ObjectInspector.class));
workspaceJVars[1] = g.declareClassField("udfInstance", g.getModel()._ref(GenericUDF.class));
workspaceJVars[2] = g.declareClassField("deferredObjects", g.getModel()._ref(DrillDeferredObject[].class));
workspaceJVars[3] = g.declareClassField("arguments", g.getModel()._ref(DrillDeferredObject[].class));
workspaceJVars[4] = g.declareClassField("returnValueHolder",
TypeHelper.getHolderType(g.getModel(), returnType.getMinorType(), TypeProtos.DataMode.OPTIONAL));
return workspaceJVars;
}
/**
* Complete code generation
* @param g
* @param inputVariables
* @param workspaceJVars
* @return HoldingContainer for return value
*/
@Override
public HoldingContainer renderEnd(ClassGenerator<?> g, HoldingContainer[] inputVariables, JVar[] workspaceJVars) {
generateSetup(g, workspaceJVars);
return generateEval(g, inputVariables, workspaceJVars);
}
private JInvocation getUDFInstance(JCodeModel m) {
if (isGenericUDF) {
return JExpr._new(m.directClass(genericUdfClazz.getCanonicalName()));
} else {
return JExpr._new(m.directClass(GenericUDFBridge.class.getCanonicalName()))
.arg(JExpr.lit(udfName))
.arg(JExpr.lit(false))
.arg(JExpr.dotclass(m.directClass(udfClazz.getCanonicalName())));
}
}
@Override
public FunctionHolderExpression getExpr(String name, List<LogicalExpression> args, ExpressionPosition pos) {
return new HiveFuncHolderExpr(name, this, args, pos);
}
private void generateSetup(ClassGenerator<?> g, JVar[] workspaceJVars) {
JCodeModel m = g.getModel();
JBlock sub = new JBlock(true, true);
// declare and instantiate argument ObjectInspector's
JVar oiArray = sub.decl(
m._ref(ObjectInspector[].class),
"argOIs",
JExpr.newArray(m._ref(ObjectInspector.class), argTypes.length));
JClass oih = m.directClass(ObjectInspectorHelper.class.getCanonicalName());
JClass mt = m.directClass(TypeProtos.MinorType.class.getCanonicalName());
JClass mode = m.directClass(DataMode.class.getCanonicalName());
for(int i=0; i<argTypes.length; i++) {
sub.assign(
oiArray.component(JExpr.lit(i)),
oih.staticInvoke("getDrillObjectInspector")
.arg(mode.staticInvoke("valueOf").arg(JExpr.lit(argTypes[i].getMode().getNumber())))
.arg(mt.staticInvoke("valueOf").arg(JExpr.lit(argTypes[i].getMinorType().getNumber()))));
}
// declare and instantiate DeferredObject array
sub.assign(workspaceJVars[2], JExpr.newArray(m._ref(DrillDeferredObject.class), argTypes.length));
for(int i=0; i<argTypes.length; i++) {
sub.assign(
workspaceJVars[2].component(JExpr.lit(i)),
JExpr._new(m.directClass(DrillDeferredObject.class.getCanonicalName())));
}
// declare empty array for argument deferred objects
sub.assign(workspaceJVars[3], JExpr.newArray(m._ref(DrillDeferredObject.class), argTypes.length));
// create new instance of the UDF class
sub.assign(workspaceJVars[1], getUDFInstance(m));
// create try..catch block to initialize the UDF instance with argument OIs
JTryBlock udfInitTry = sub._try();
udfInitTry.body().assign(
workspaceJVars[0],
workspaceJVars[1].invoke("initialize")
.arg(oiArray));
JCatchBlock udfInitCatch = udfInitTry._catch(m.directClass(Exception.class.getCanonicalName()));
JVar exVar = udfInitCatch.param("ex");
udfInitCatch.body()
._throw(JExpr._new(m.directClass(RuntimeException.class.getCanonicalName()))
.arg(JExpr.lit(String.format("Failed to initialize GenericUDF"))).arg(exVar));
sub.add(ObjectInspectorHelper.initReturnValueHolder(g, m, workspaceJVars[4], returnOI, returnType.getMinorType()));
// now add it to the doSetup block in Generated class
JBlock setup = g.getBlock(ClassGenerator.BlockType.SETUP);
setup.directStatement(String.format("/** start %s for function %s **/ ",
ClassGenerator.BlockType.SETUP.name(), genericUdfClazz.getName() + (!isGenericUDF ? "("+udfName+")" : "")));
setup.add(sub);
setup.directStatement(String.format("/** end %s for function %s **/ ",
ClassGenerator.BlockType.SETUP.name(), genericUdfClazz.getName() + (!isGenericUDF ? "("+udfName+")" : "")));
}
private HoldingContainer generateEval(ClassGenerator<?> g, HoldingContainer[] inputVariables, JVar[] workspaceJVars) {
HoldingContainer out = g.declare(returnType);
JCodeModel m = g.getModel();
JBlock sub = new JBlock(true, true);
// initialize DeferredObject's. For an optional type, assign the value holder only if it is not null
for(int i=0; i<argTypes.length; i++) {
if (inputVariables[i].isOptional()) {
JBlock conditionalBlock = new JBlock(false, false);
JConditional jc = conditionalBlock._if(inputVariables[i].getIsSet().ne(JExpr.lit(0)));
jc._then().assign(workspaceJVars[3].component(JExpr.lit(i)), workspaceJVars[2].component(JExpr.lit(i)));
jc._then().assign(JExpr.ref(workspaceJVars[3].component(JExpr.lit(i)), "valueHolder"), inputVariables[i].getHolder());
jc._else().assign(workspaceJVars[3].component(JExpr.lit(i)), JExpr._null());
sub.add(conditionalBlock);
} else {
sub.assign(workspaceJVars[3].component(JExpr.lit(i)), workspaceJVars[2].component(JExpr.lit(i)));
sub.assign(JExpr.ref(workspaceJVars[3].component(JExpr.lit(i)), "valueHolder"), inputVariables[i].getHolder());
}
}
// declare generic object for storing return value from GenericUDF.evaluate
JVar retVal = sub.decl(m._ref(Object.class), "ret");
// create try..catch block to call the GenericUDF instance with given input
JTryBlock udfEvalTry = sub._try();
udfEvalTry.body().assign(retVal,
workspaceJVars[1].invoke("evaluate").arg(workspaceJVars[3]));
JCatchBlock udfEvalCatch = udfEvalTry._catch(m.directClass(Exception.class.getCanonicalName()));
JVar exVar = udfEvalCatch.param("ex");
udfEvalCatch.body()
._throw(JExpr._new(m.directClass(RuntimeException.class.getCanonicalName()))
.arg(JExpr.lit(String.format("GenericUDF.evaluate method failed"))).arg(exVar));
// get the ValueHolder from retVal and return ObjectInspector
sub.add(ObjectInspectorHelper.getDrillObject(m, returnOI, workspaceJVars[0], workspaceJVars[4], retVal));
sub.assign(out.getHolder(), workspaceJVars[4]);
// now add it to the doEval block in Generated class
JBlock setup = g.getBlock(ClassGenerator.BlockType.EVAL);
setup.directStatement(String.format("/** start %s for function %s **/ ",
ClassGenerator.BlockType.EVAL.name(), genericUdfClazz.getName() + (!isGenericUDF ? "("+udfName+")" : "")));
setup.add(sub);
setup.directStatement(String.format("/** end %s for function %s **/ ",
ClassGenerator.BlockType.EVAL.name(), genericUdfClazz.getName() + (!isGenericUDF ? "("+udfName+")" : "")));
return out;
}
}