| /* |
| * 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.impl; |
| |
| import com.sun.codemodel.JBlock; |
| import com.sun.codemodel.JExpr; |
| import com.sun.codemodel.JFieldRef; |
| import org.apache.drill.common.expression.ExpressionPosition; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.ValueExpressions; |
| import org.apache.drill.common.types.TypeProtos; |
| import org.apache.drill.common.types.Types; |
| import org.apache.drill.exec.compile.TemplateClassDefinition; |
| import org.apache.drill.exec.compile.sig.GeneratorMapping; |
| import org.apache.drill.exec.compile.sig.MappingSet; |
| import org.apache.drill.exec.compile.sig.RuntimeOverridden; |
| import org.apache.drill.exec.exception.ClassTransformationException; |
| import org.apache.drill.exec.exception.SchemaChangeException; |
| import org.apache.drill.exec.expr.ClassGenerator; |
| import org.apache.drill.exec.expr.CodeGenerator; |
| import org.apache.drill.exec.expr.ExpressionTreeMaterializer; |
| import org.apache.drill.exec.ops.FragmentContext; |
| import org.apache.drill.exec.planner.physical.HashPrelUtil; |
| import org.apache.drill.exec.record.RecordBatch; |
| import org.apache.drill.exec.record.TypedFieldId; |
| import org.apache.drill.exec.record.VectorAccessible; |
| |
| import javax.inject.Named; |
| import java.io.IOException; |
| |
| public class ValueVectorHashHelper { |
| |
| private RecordBatch recordBatch; |
| |
| private FragmentContext context; |
| |
| private TemplateClassDefinition<Hash64> TEMPLATE_DEFINITION = new TemplateClassDefinition<Hash64>(Hash64.class, Hash64Template.class); |
| |
| private static final GeneratorMapping DO_SETUP_CONSTANT = GeneratorMapping.create("doSetup" /* setup method */, "doSetup" /* eval method */, null /* reset */, null /* cleanup */); |
| |
| private static final GeneratorMapping GET_HASH_BUILD_INNER = GeneratorMapping.create("doSetup" /* setup method */, "hash64Code" /* eval method */, null /* reset */, null /* cleanup */); |
| |
| private final MappingSet GetHashIncomingBuildColMapping = new MappingSet("incomingRowIdx", null, "incoming", null, DO_SETUP_CONSTANT, GET_HASH_BUILD_INNER); |
| |
| public ValueVectorHashHelper(RecordBatch recordBatch, FragmentContext context) { |
| this.recordBatch = recordBatch; |
| this.context = context; |
| } |
| |
| |
| public Hash64 getHash64(LogicalExpression[] hashFieldsExp, TypedFieldId[] hashFieldIds) throws ClassTransformationException, IOException, SchemaChangeException { |
| CodeGenerator<Hash64> codeGenerator = CodeGenerator.get(TEMPLATE_DEFINITION); |
| codeGenerator.plainJavaCapable(true); |
| //codeGenerator.saveCodeForDebugging(true); |
| codeGenerator.preferPlainJava(true); // use a subclass |
| |
| ClassGenerator<Hash64> cg = codeGenerator.getRoot(); |
| setupBuild64Hash(cg, GetHashIncomingBuildColMapping, recordBatch, hashFieldsExp, hashFieldIds); |
| Hash64 hash64 = context.getImplementationClass(codeGenerator); |
| hash64.doSetup(recordBatch); |
| return hash64; |
| } |
| |
| private void setupBuild64Hash(ClassGenerator<Hash64> cg, MappingSet incomingMapping, VectorAccessible batch, LogicalExpression[] keyExprs, TypedFieldId[] toHashKeyFieldIds) throws SchemaChangeException { |
| cg.setMappingSet(incomingMapping); |
| if (keyExprs == null || keyExprs.length == 0) { |
| cg.getEvalBlock()._return(JExpr.lit(0)); |
| } |
| String seedValue = "seedValue"; |
| String fieldId = "fieldId"; |
| LogicalExpression seed = ValueExpressions.getParameterExpression(seedValue, Types.required(TypeProtos.MinorType.INT)); |
| |
| LogicalExpression fieldIdParamExpr = ValueExpressions.getParameterExpression(fieldId, Types.required(TypeProtos.MinorType.INT)); |
| ClassGenerator.HoldingContainer fieldIdParamHolder = cg.addExpr(fieldIdParamExpr); |
| int i = 0; |
| for (LogicalExpression expr : keyExprs) { |
| TypedFieldId targetTypeFieldId = toHashKeyFieldIds[i]; |
| ValueExpressions.IntExpression targetBuildFieldIdExp = new ValueExpressions.IntExpression(targetTypeFieldId.getFieldIds()[0], ExpressionPosition.UNKNOWN); |
| |
| JFieldRef targetBuildSideFieldId = cg.addExpr(targetBuildFieldIdExp, ClassGenerator.BlkCreateMode.TRUE_IF_BOUND).getValue(); |
| JBlock ifBlock = cg.getEvalBlock()._if(fieldIdParamHolder.getValue().eq(targetBuildSideFieldId))._then(); |
| cg.nestEvalBlock(ifBlock); |
| LogicalExpression hashExpression = HashPrelUtil.getHash64Expression(expr, seed, true); |
| LogicalExpression materializedExpr = ExpressionTreeMaterializer.materializeAndCheckErrors(hashExpression, batch, context.getFunctionRegistry()); |
| ClassGenerator.HoldingContainer hash = cg.addExpr(materializedExpr, ClassGenerator.BlkCreateMode.TRUE_IF_BOUND); |
| ifBlock._return(hash.getValue()); |
| cg.unNestEvalBlock(); |
| i++; |
| } |
| cg.getEvalBlock()._return(JExpr.lit(0)); |
| } |
| |
| |
| public interface Hash64 { |
| |
| public void doSetup(RecordBatch incoming) throws SchemaChangeException; |
| |
| public long hash64Code(int incomingRowIdx, int seedValue, int fieldId) throws SchemaChangeException; |
| } |
| |
| public static abstract class Hash64Template implements Hash64 { |
| @Override |
| @RuntimeOverridden |
| public abstract void doSetup(@Named("incoming") RecordBatch incoming) throws SchemaChangeException; |
| |
| @Override |
| @RuntimeOverridden |
| public abstract long hash64Code(@Named("incomingRowIdx") int incomingRowIdx, @Named("seedValue") int seedValue, @Named("fieldId") int fieldId) throws SchemaChangeException; |
| } |
| } |