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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 com.hazelcast.org.apache.calcite.rex;

import com.hazelcast.org.apache.calcite.DataContext;
import com.hazelcast.org.apache.calcite.adapter.enumerable.EnumUtils;
import com.hazelcast.org.apache.calcite.adapter.enumerable.RexToLixTranslator;
import com.hazelcast.org.apache.calcite.adapter.enumerable.RexToLixTranslator.InputGetter;
import com.hazelcast.org.apache.calcite.adapter.java.JavaTypeFactory;
import com.hazelcast.org.apache.calcite.config.CalciteSystemProperty;
import com.hazelcast.org.apache.calcite.jdbc.JavaTypeFactoryImpl;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockBuilder;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expressions;
import com.hazelcast.org.apache.calcite.linq4j.tree.IndexExpression;
import com.hazelcast.org.apache.calcite.linq4j.tree.MethodCallExpression;
import com.hazelcast.org.apache.calcite.linq4j.tree.MethodDeclaration;
import com.hazelcast.org.apache.calcite.linq4j.tree.ParameterExpression;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformance;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformanceEnum;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;
import com.hazelcast.org.apache.calcite.util.Util;

import com.hazelcast.com.google.common.collect.ImmutableList;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;

import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.List;

/**
 * Evaluates a {@link RexNode} expression.
 *
 * 

For this impl, all the public methods should be * static except that it inherits from {@link RexExecutor}. * This pretends that other code in the project assumes * the executor instance is {@link RexExecutorImpl}. */ public class RexExecutorImpl implements RexExecutor { private final DataContext dataContext; public RexExecutorImpl(DataContext dataContext) { this.dataContext = dataContext; } private static String compile(RexBuilder rexBuilder, List constExps, RexToLixTranslator.InputGetter getter) { final RelDataTypeFactory typeFactory = rexBuilder.getTypeFactory(); final RelDataType emptyRowType = typeFactory.builder().build(); return compile(rexBuilder, constExps, getter, emptyRowType); } private static String compile(RexBuilder rexBuilder, List constExps, RexToLixTranslator.InputGetter getter, RelDataType rowType) { final RexProgramBuilder programBuilder = new RexProgramBuilder(rowType, rexBuilder); for (RexNode node : constExps) { programBuilder.addProject( node, "c" + programBuilder.getProjectList().size()); } final RelDataTypeFactory typeFactory = rexBuilder.getTypeFactory(); final JavaTypeFactory javaTypeFactory = typeFactory instanceof JavaTypeFactory ? (JavaTypeFactory) typeFactory : new JavaTypeFactoryImpl(typeFactory.getTypeSystem()); final BlockBuilder blockBuilder = new BlockBuilder(); final ParameterExpression root0_ = Expressions.parameter(Object.class, "root0"); final ParameterExpression root_ = DataContext.ROOT; blockBuilder.add( Expressions.declare( Modifier.FINAL, root_, Expressions.convert_(root0_, DataContext.class))); final SqlConformance conformance = SqlConformanceEnum.DEFAULT; final RexProgram program = programBuilder.getProgram(); final List expressions = RexToLixTranslator.translateProjects(program, javaTypeFactory, conformance, blockBuilder, null, null, root_, getter, null); blockBuilder.add( Expressions.return_(null, Expressions.newArrayInit(Object[].class, expressions))); final MethodDeclaration methodDecl = Expressions.methodDecl(Modifier.PUBLIC, Object[].class, BuiltInMethod.FUNCTION1_APPLY.method.getName(), ImmutableList.of(root0_), blockBuilder.toBlock()); String code = Expressions.toString(methodDecl); if (CalciteSystemProperty.DEBUG.value()) { Util.debugCode(System.out, code); } return code; } /** * Creates an {@link RexExecutable} that allows to apply the * generated code during query processing (filter, projection). * * @param rexBuilder Rex builder * @param exps Expressions * @param rowType describes the structure of the input row. */ public static RexExecutable getExecutable(RexBuilder rexBuilder, List exps, RelDataType rowType) { final JavaTypeFactoryImpl typeFactory = new JavaTypeFactoryImpl(rexBuilder.getTypeFactory().getTypeSystem()); final InputGetter getter = new DataContextInputGetter(rowType, typeFactory); final String code = compile(rexBuilder, exps, getter, rowType); return new RexExecutable(code, "generated Rex code"); } /** * Do constant reduction using generated code. */ @Override public void reduce(RexBuilder rexBuilder, List constExps, List reducedValues) { final String code = compile(rexBuilder, constExps, (list, index, storageType) -> { throw new UnsupportedOperationException(); }); final RexExecutable executable = new RexExecutable(code, constExps); executable.setDataContext(dataContext); executable.reduce(rexBuilder, constExps, reducedValues); } /** * Implementation of * {@link com.hazelcast.org.apache.calcite.adapter.enumerable.RexToLixTranslator.InputGetter} * that reads the values of input fields by calling * {@link com.hazelcast.org.apache.calcite.DataContext#get}("inputRecord"). */ private static class DataContextInputGetter implements InputGetter { private final RelDataTypeFactory typeFactory; private final RelDataType rowType; DataContextInputGetter(RelDataType rowType, RelDataTypeFactory typeFactory) { this.rowType = rowType; this.typeFactory = typeFactory; } @Override public Expression field(BlockBuilder list, int index, @Nullable Type storageType) { MethodCallExpression recFromCtx = Expressions.call( DataContext.ROOT, BuiltInMethod.DATA_CONTEXT_GET.method, Expressions.constant("inputRecord")); Expression recFromCtxCasted = EnumUtils.convert(recFromCtx, Object[].class); IndexExpression recordAccess = Expressions.arrayIndex(recFromCtxCasted, Expressions.constant(index)); if (storageType == null) { final RelDataType fieldType = rowType.getFieldList().get(index).getType(); storageType = ((JavaTypeFactory) typeFactory).getJavaClass(fieldType); } return EnumUtils.convert(recordAccess, storageType); } } }





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