com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableWindowRule 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.adapter.enumerable;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.convert.ConverterRule;
import com.hazelcast.org.apache.calcite.rel.core.Window;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalWindow;
/**
* Rule to convert a {@link LogicalWindow} to an {@link EnumerableWindow}.
* You may provide a custom config to convert other nodes that extend {@link Window}.
*
* @see EnumerableRules#ENUMERABLE_WINDOW_RULE
*/
class EnumerableWindowRule extends ConverterRule {
/** Default configuration. */
static final Config DEFAULT_CONFIG = Config.INSTANCE
.withConversion(LogicalWindow.class, Convention.NONE,
EnumerableConvention.INSTANCE, "EnumerableWindowRule")
.withRuleFactory(EnumerableWindowRule::new);
/** Called from the Config. */
protected EnumerableWindowRule(Config config) {
super(config);
}
@Override public RelNode convert(RelNode rel) {
final Window winAgg = (Window) rel;
final RelTraitSet traitSet =
winAgg.getTraitSet().replace(EnumerableConvention.INSTANCE);
final RelNode child = winAgg.getInput();
final RelNode convertedChild =
convert(child,
child.getTraitSet().replace(EnumerableConvention.INSTANCE));
return new EnumerableWindow(rel.getCluster(), traitSet, convertedChild,
winAgg.getConstants(), winAgg.getRowType(), winAgg.groups);
}
}