com.hazelcast.jet.sql.impl.opt.metadata.HazelcastRelMdRowCount Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.opt.metadata;
import com.hazelcast.org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMdRowCount;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataProvider;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;
/**
* Metadata which provides row count estimates.
*/
public final class HazelcastRelMdRowCount extends RelMdRowCount {
/** Do not change the name (see {@code RelMetadataQueryBase} JavaDoc). */
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(BuiltInMethod.ROW_COUNT.method, new HazelcastRelMdRowCount());
private HazelcastRelMdRowCount() {
// No-op.
}
// Empty at the moment, will be extended in the future.
// Now it serves as an example of how to wire up a metadata handler into Calcite.
}
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