| /* |
| * 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.physical.impl.xsort; |
| |
| import org.apache.calcite.rel.RelFieldCollation.Direction; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.expression.ErrorCollector; |
| import org.apache.drill.common.expression.ErrorCollectorImpl; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.logical.data.Order.Ordering; |
| import org.apache.drill.exec.compile.sig.MappingSet; |
| import org.apache.drill.exec.expr.ClassGenerator; |
| import org.apache.drill.exec.expr.ClassGenerator.HoldingContainer; |
| import org.apache.drill.exec.expr.ExpressionTreeMaterializer; |
| import org.apache.drill.exec.expr.fn.FunctionGenerationHelper; |
| import org.apache.drill.exec.ops.OperatorContext; |
| import org.apache.drill.exec.physical.config.Sort; |
| import org.apache.drill.exec.record.VectorAccessible; |
| |
| import com.sun.codemodel.JConditional; |
| import com.sun.codemodel.JExpr; |
| |
| /** |
| * Base wrapper for algorithms that use sort comparisons. |
| */ |
| |
| public abstract class BaseSortWrapper extends BaseWrapper { |
| |
| protected final MappingSet MAIN_MAPPING = new MappingSet((String) null, null, ClassGenerator.DEFAULT_SCALAR_MAP, ClassGenerator.DEFAULT_SCALAR_MAP); |
| protected final MappingSet LEFT_MAPPING = new MappingSet("leftIndex", null, ClassGenerator.DEFAULT_SCALAR_MAP, ClassGenerator.DEFAULT_SCALAR_MAP); |
| protected final MappingSet RIGHT_MAPPING = new MappingSet("rightIndex", null, ClassGenerator.DEFAULT_SCALAR_MAP, ClassGenerator.DEFAULT_SCALAR_MAP); |
| |
| public BaseSortWrapper(OperatorContext opContext) { |
| super(opContext); |
| } |
| |
| protected void generateComparisons(ClassGenerator<?> g, VectorAccessible batch, org.slf4j.Logger logger) { |
| g.setMappingSet(MAIN_MAPPING); |
| |
| Sort popConfig = context.getOperatorDefn(); |
| for (Ordering od : popConfig.getOrderings()) { |
| // first, we rewrite the evaluation stack for each side of the comparison. |
| ErrorCollector collector = new ErrorCollectorImpl(); |
| final LogicalExpression expr = ExpressionTreeMaterializer.materialize(od.getExpr(), batch, collector, |
| context.getFragmentContext().getFunctionRegistry()); |
| if (collector.hasErrors()) { |
| throw UserException.unsupportedError() |
| .message("Failure while materializing expression. " + collector.toErrorString()) |
| .build(logger); |
| } |
| g.setMappingSet(LEFT_MAPPING); |
| HoldingContainer left = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE); |
| g.setMappingSet(RIGHT_MAPPING); |
| HoldingContainer right = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE); |
| g.setMappingSet(MAIN_MAPPING); |
| |
| // next we wrap the two comparison sides and add the expression block for the comparison. |
| LogicalExpression fh = |
| FunctionGenerationHelper.getOrderingComparator(od.nullsSortHigh(), left, right, |
| context.getFragmentContext().getFunctionRegistry()); |
| HoldingContainer out = g.addExpr(fh, ClassGenerator.BlkCreateMode.FALSE); |
| JConditional jc = g.getEvalBlock()._if(out.getValue().ne(JExpr.lit(0))); |
| |
| if (od.getDirection() == Direction.ASCENDING) { |
| jc._then()._return(out.getValue()); |
| }else{ |
| jc._then()._return(out.getValue().minus()); |
| } |
| g.rotateBlock(); |
| } |
| |
| g.rotateBlock(); |
| g.getEvalBlock()._return(JExpr.lit(0)); |
| } |
| |
| } |