com.hazelcast.org.apache.calcite.rel.metadata.RelMdExplainVisibility 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.sql.SqlExplainLevel;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
/**
* RelMdExplainVisibility supplies a default implementation of
* {@link RelMetadataQuery#isVisibleInExplain} for the standard logical algebra.
*/
public class RelMdExplainVisibility
implements MetadataHandler {
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(
new RelMdExplainVisibility(), BuiltInMetadata.ExplainVisibility.Handler.class);
//~ Constructors -----------------------------------------------------------
private RelMdExplainVisibility() {}
//~ Methods ----------------------------------------------------------------
@Override public MetadataDef getDef() {
return BuiltInMetadata.ExplainVisibility.DEF;
}
/** Catch-all implementation for
* {@link BuiltInMetadata.ExplainVisibility#isVisibleInExplain(SqlExplainLevel)},
* invoked using reflection.
*
* @see com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery#isVisibleInExplain(RelNode, SqlExplainLevel)
*/
public @Nullable Boolean isVisibleInExplain(RelNode rel, RelMetadataQuery mq,
SqlExplainLevel explainLevel) {
// no information available
return null;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy