com.hazelcast.org.apache.calcite.rel.logical.LogicalSnapshot Maven / Gradle / Ivy
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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.rel.logical;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelCollationTraitDef;
import com.hazelcast.org.apache.calcite.rel.RelDistributionTraitDef;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Snapshot;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMdCollation;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMdDistribution;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery;
import com.hazelcast.org.apache.calcite.rex.RexNode;
/**
* Sub-class of {@link com.hazelcast.org.apache.calcite.rel.core.Snapshot}
* not targeted at any particular engine or calling convention.
*/
public class LogicalSnapshot extends Snapshot {
//~ Constructors -----------------------------------------------------------
/**
* Creates a LogicalSnapshot.
*
* Use {@link #create} unless you know what you're doing.
*
* @param cluster Cluster that this relational expression belongs to
* @param traitSet The traits of this relational expression
* @param input Input relational expression
* @param period Timestamp expression which as the table was at the given
* time in the past
*/
public LogicalSnapshot(RelOptCluster cluster, RelTraitSet traitSet,
RelNode input, RexNode period) {
super(cluster, traitSet, input, period);
}
@Override public Snapshot copy(RelTraitSet traitSet, RelNode input,
RexNode period) {
return new LogicalSnapshot(getCluster(), traitSet, input, period);
}
/** Creates a LogicalSnapshot. */
public static LogicalSnapshot create(RelNode input, RexNode period) {
final RelOptCluster cluster = input.getCluster();
final RelMetadataQuery mq = cluster.getMetadataQuery();
final RelTraitSet traitSet = cluster.traitSet()
.replace(Convention.NONE)
.replaceIfs(RelCollationTraitDef.INSTANCE,
() -> RelMdCollation.snapshot(mq, input))
.replaceIf(RelDistributionTraitDef.INSTANCE,
() -> RelMdDistribution.snapshot(mq, input));
return new LogicalSnapshot(cluster, traitSet, input, period);
}
}