com.hazelcast.sql.impl.calcite.opt.HazelcastConventions Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in com.hazelcast.com.liance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.com.hazelcast.sql.impl.calcite.opt;
import com.hazelcast.com.hazelcast.sql.impl.calcite.opt.logical.LogicalRel;
import com.hazelcast.com.hazelcast.sql.impl.calcite.opt.physical.PhysicalRel;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
/**
* Hazelcast conventions.
*/
public final class HazelcastConventions {
/** Convention used during logical planning. */
public static final Convention LOGICAL = new Convention.Impl("LOGICAL", LogicalRel.class);
/** Convention used during physical planning. */
public static final Convention PHYSICAL = new Convention.Impl("PHYSICAL", PhysicalRel.class) {
@Override
public boolean canConvertConvention(Convention toConvention) {
// Allows conversion between LOGICAL and PHYSICAL conventions.
assert toConvention == LOGICAL;
return true;
}
@Override
public boolean useAbstractConvertersForConversion(RelTraitSet fromTraits, RelTraitSet toTraits) {
// Forces Apache Calcite to install abstract converters when traits of two relations do not satisfy each other.
// The converter will have LOGICAL "from" convention and PHYSICAL "to" convention. As a result, installation
// of such a converter into a search space will re-trigger rules on LOGICAL parents, giving these rules a chance
// to propagate physical traits from children nodes.
return !fromTraits.satisfies(toTraits);
}
};
private HazelcastConventions() {
// No-op.
}
}