com.hazelcast.org.apache.calcite.rel.metadata.RelMdParallelism Maven / Gradle / Ivy
/*
* 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.rel.metadata;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Exchange;
import com.hazelcast.org.apache.calcite.rel.core.TableScan;
import com.hazelcast.org.apache.calcite.rel.core.Values;
/**
* Default implementations of the
* {@link com.hazelcast.org.apache.calcite.rel.metadata.BuiltInMetadata.Parallelism}
* metadata provider for the standard logical algebra.
*
* @see com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery#isPhaseTransition
* @see com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery#splitCount
*/
public class RelMdParallelism
implements MetadataHandler {
/** Source for
* {@link com.hazelcast.org.apache.calcite.rel.metadata.BuiltInMetadata.Parallelism}. */
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(new RelMdParallelism(),
BuiltInMetadata.Parallelism.Handler.class);
//~ Constructors -----------------------------------------------------------
protected RelMdParallelism() {}
//~ Methods ----------------------------------------------------------------
@Override public MetadataDef getDef() {
return BuiltInMetadata.Parallelism.DEF;
}
/** Catch-all implementation for
* {@link BuiltInMetadata.Parallelism#isPhaseTransition()},
* invoked using reflection.
*
* @see com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery#isPhaseTransition
*/
public Boolean isPhaseTransition(RelNode rel, RelMetadataQuery mq) {
return false;
}
public Boolean isPhaseTransition(TableScan rel, RelMetadataQuery mq) {
return true;
}
public Boolean isPhaseTransition(Values rel, RelMetadataQuery mq) {
return true;
}
public Boolean isPhaseTransition(Exchange rel, RelMetadataQuery mq) {
return true;
}
/** Catch-all implementation for
* {@link BuiltInMetadata.Parallelism#splitCount()},
* invoked using reflection.
*
* @see com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery#splitCount
*/
public Integer splitCount(RelNode rel, RelMetadataQuery mq) {
return 1;
}
}