arina-ielchiieva commented on a change in pull request #1944: DRILL-7503: Refactor the project operator URL: https://github.com/apache/drill/pull/1944#discussion_r364290284
########## File path: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectionMaterializer.java ########## @@ -0,0 +1,625 @@ +/* + * 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.project; + +import java.io.IOException; +import java.util.HashMap; +import java.util.List; + +import org.apache.commons.collections.map.CaseInsensitiveMap; +import org.apache.drill.common.expression.ConvertExpression; +import org.apache.drill.common.expression.ErrorCollector; +import org.apache.drill.common.expression.ErrorCollectorImpl; +import org.apache.drill.common.expression.ExpressionPosition; +import org.apache.drill.common.expression.FieldReference; +import org.apache.drill.common.expression.FunctionCall; +import org.apache.drill.common.expression.FunctionCallFactory; +import org.apache.drill.common.expression.LogicalExpression; +import org.apache.drill.common.expression.SchemaPath; +import org.apache.drill.common.expression.ValueExpressions; +import org.apache.drill.common.expression.PathSegment.NameSegment; +import org.apache.drill.common.expression.fn.FunctionReplacementUtils; +import org.apache.drill.common.logical.data.NamedExpression; +import org.apache.drill.common.types.Types; +import org.apache.drill.common.types.TypeProtos.MinorType; +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.DrillFuncHolderExpr; +import org.apache.drill.exec.expr.ExpressionTreeMaterializer; +import org.apache.drill.exec.expr.ValueVectorReadExpression; +import org.apache.drill.exec.expr.ValueVectorWriteExpression; +import org.apache.drill.exec.expr.fn.FunctionLookupContext; +import org.apache.drill.exec.ops.FragmentContext; +import org.apache.drill.exec.planner.StarColumnHelper; +import org.apache.drill.exec.record.MaterializedField; +import org.apache.drill.exec.record.VectorAccessible; +import org.apache.drill.exec.record.VectorWrapper; +import org.apache.drill.exec.record.BatchSchema; +import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode; +import org.apache.drill.exec.server.options.OptionManager; +import org.apache.drill.exec.store.ColumnExplorer; +import org.apache.drill.exec.vector.ValueVector; +import org.apache.drill.shaded.guava.com.google.common.collect.Lists; +import org.apache.drill.shaded.guava.com.google.common.collect.Maps; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.carrotsearch.hppc.IntHashSet; + +/** + * Plans the projection given the incoming and requested outgoing schemas. Works + * with the {@link VectorState} to create required vectors, writers and so on. + * Populates the code generator with the "projector" expressions. + */ +class ProjectionMaterializer { + private static final Logger logger = LoggerFactory.getLogger(ProjectionMaterializer.class); + private static final String EMPTY_STRING = ""; + + /** + * Abstracts the physical vector setup operations to separate + * the physical setup, in <code>ProjectRecordBatch</code>, from the + * logical setup in the materializer class. + */ + public interface BatchBuilder { + void addTransferField(String name, ValueVector vvIn); + ValueVectorWriteExpression addOutputVector(String name, LogicalExpression expr); + int addDirectTransfer(FieldReference ref, ValueVectorReadExpression vectorRead); + void addComplexField(FieldReference ref); + ValueVectorWriteExpression addEvalVector(String outputName, + LogicalExpression expr); + } + + private static class ClassifierResult { + private boolean isStar; + private List<String> outputNames; + private String prefix = ""; + private final HashMap<String, Integer> prefixMap = Maps.newHashMap(); + private final CaseInsensitiveMap outputMap = new CaseInsensitiveMap(); + private final CaseInsensitiveMap sequenceMap = new CaseInsensitiveMap(); + + private void clear() { + isStar = false; + prefix = ""; + if (outputNames != null) { + outputNames.clear(); + } + + // note: don't clear the internal maps since they have cumulative data.. + } + } + + private final ClassGenerator<Projector> cg; + private final VectorAccessible incomingBatch; + private final BatchSchema incomingSchema; + private final List<NamedExpression> exprSpec; + private final FunctionLookupContext functionLookupContext; + private final BatchBuilder batchBuilder; + private final boolean unionTypeEnabled; + private final ErrorCollector collector = new ErrorCollectorImpl(); + private final ColumnExplorer columnExplorer; + private final IntHashSet transferFieldIds = new IntHashSet(); + private final ProjectionMaterializer.ClassifierResult result = new ClassifierResult(); + private boolean isAnyWildcard; + private boolean classify; + + public ProjectionMaterializer(OptionManager options, + VectorAccessible incomingBatch, List<NamedExpression> exprSpec, + FunctionLookupContext functionLookupContext, BatchBuilder batchBuilder, + boolean unionTypeEnabled) { + this.incomingBatch = incomingBatch; + this.incomingSchema = incomingBatch.getSchema(); + this.exprSpec = exprSpec; + this.functionLookupContext = functionLookupContext; + this.batchBuilder = batchBuilder; + this.unionTypeEnabled = unionTypeEnabled; + columnExplorer = new ColumnExplorer(options); + cg = CodeGenerator.getRoot(Projector.TEMPLATE_DEFINITION, options); + } + + public Projector generateProjector(FragmentContext context, boolean saveCode) + throws ClassTransformationException, IOException, SchemaChangeException { + long setupNewSchemaStartTime = System.currentTimeMillis(); + setup(); + CodeGenerator<Projector> codeGen = cg.getCodeGenerator(); + codeGen.plainJavaCapable(true); + codeGen.saveCodeForDebugging(saveCode); + Projector projector = context.getImplementationClass(codeGen); + + long setupNewSchemaEndTime = System.currentTimeMillis(); + logger.trace("generateProjector: time {} ms, Project {}, incoming {}", + (setupNewSchemaEndTime - setupNewSchemaStartTime), exprSpec, incomingSchema); + return projector; + } + + private void setup() throws SchemaChangeException { + List<NamedExpression> exprs = exprSpec != null ? exprSpec + : inferExpressions(); + isAnyWildcard = isAnyWildcard(exprs); + classify = isClassificationNeeded(exprs); + + for (NamedExpression namedExpression : exprs) { + setupExpression(namedExpression); + } + } + + private List<NamedExpression> inferExpressions() { + List<NamedExpression> exprs = Lists.newArrayList(); Review comment: Please replace with new ArrayList<>() if possible ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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