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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 org.apache.calcite.adapter.geode.rel;
import org.apache.calcite.adapter.enumerable.EnumerableRel;
import org.apache.calcite.adapter.enumerable.EnumerableRelImplementor;
import org.apache.calcite.adapter.enumerable.JavaRowFormat;
import org.apache.calcite.adapter.enumerable.PhysType;
import org.apache.calcite.adapter.enumerable.PhysTypeImpl;
import org.apache.calcite.adapter.geode.rel.GeodeRel.GeodeImplementContext;
import org.apache.calcite.linq4j.tree.BlockBuilder;
import org.apache.calcite.linq4j.tree.Expression;
import org.apache.calcite.linq4j.tree.Expressions;
import org.apache.calcite.linq4j.tree.MethodCallExpression;
import org.apache.calcite.linq4j.tree.Types;
import org.apache.calcite.plan.ConventionTraitDef;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.convert.ConverterImpl;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.util.BuiltInMethod;
import org.apache.calcite.util.Pair;
import com.google.common.collect.Lists;
import java.lang.reflect.Method;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static org.apache.calcite.adapter.geode.rel.GeodeRules.geodeFieldNames;
/**
* Relational expression representing a scan of a table in a Geode data source.
*/
public class GeodeToEnumerableConverter extends ConverterImpl implements EnumerableRel {
protected GeodeToEnumerableConverter(RelOptCluster cluster,
RelTraitSet traitSet, RelNode input) {
super(cluster, ConventionTraitDef.INSTANCE, traitSet, input);
}
@Override public RelNode copy(RelTraitSet traitSet, List inputs) {
return new GeodeToEnumerableConverter(
getCluster(), traitSet, sole(inputs));
}
@Override public RelOptCost computeSelfCost(RelOptPlanner planner,
RelMetadataQuery mq) {
return super.computeSelfCost(planner, mq).multiplyBy(.1);
}
/**
* Reference to the method {@link GeodeTable.GeodeQueryable#query},
* used in the {@link Expression}.
*/
private static final Method GEODE_QUERY_METHOD =
Types.lookupMethod(GeodeTable.GeodeQueryable.class, "query", List.class,
List.class, List.class, List.class, List.class, List.class,
Long.class);
/**
* {@inheritDoc}
*
* @param implementor GeodeImplementContext
*/
@Override public Result implement(EnumerableRelImplementor implementor, Prefer pref) {
// travers all relations form this to the scan leaf
final GeodeImplementContext geodeImplementContext = new GeodeImplementContext();
((GeodeRel) getInput()).implement(geodeImplementContext);
final RelDataType rowType = getRowType();
// PhysType is Enumerable Adapter class that maps SQL types (getRowType)
// with physical Java types (getJavaTypes())
final PhysType physType = PhysTypeImpl.of(
implementor.getTypeFactory(),
rowType,
pref.prefer(JavaRowFormat.ARRAY));
final List physFieldClasses = new AbstractList() {
public Class get(int index) {
return physType.fieldClass(index);
}
public int size() {
return rowType.getFieldCount();
}
};
// Expression meta-program for calling the GeodeTable.GeodeQueryable#query
// method form the generated code
final BlockBuilder blockBuilder = new BlockBuilder().append(
Expressions.call(
geodeImplementContext.table.getExpression(GeodeTable.GeodeQueryable.class),
GEODE_QUERY_METHOD,
// fields
constantArrayList(Pair.zip(geodeFieldNames(rowType), physFieldClasses), Pair.class),
// selected fields
constantArrayList(toListMapPairs(geodeImplementContext.selectFields), Pair.class),
// aggregate functions
constantArrayList(
toListMapPairs(geodeImplementContext.oqlAggregateFunctions), Pair.class),
constantArrayList(geodeImplementContext.groupByFields, String.class),
constantArrayList(geodeImplementContext.whereClause, String.class),
constantArrayList(geodeImplementContext.orderByFields, String.class),
Expressions.constant(geodeImplementContext.limitValue)));
return implementor.result(physType, blockBuilder.toBlock());
}
private static List> toListMapPairs(Map map) {
List> selectList = new ArrayList<>();
for (Map.Entry entry : Pair.zip(map.keySet(), map.values())) {
selectList.add(entry);
}
return selectList;
}
/**
* E.g. {@code constantArrayList("x", "y")} returns
* "Arrays.asList('x', 'y')".
*/
private static MethodCallExpression constantArrayList(List values,
Class clazz) {
return Expressions.call(BuiltInMethod.ARRAYS_AS_LIST.method,
Expressions.newArrayInit(clazz, constantList(values)));
}
/**
* E.g. {@code constantList("x", "y")} returns
* {@code {ConstantExpression("x"), ConstantExpression("y")}}.
*/
private static List constantList(List values) {
return Lists.transform(values, Expressions::constant);
}
}
