io.trino.sql.planner.iterative.rule.PruneSampleColumns Maven / Gradle / Ivy

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/*
 * Licensed 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 io.trino.sql.planner.iterative.rule;

import io.trino.sql.planner.Symbol;
import io.trino.sql.planner.plan.PlanNode;
import io.trino.sql.planner.plan.SampleNode;

import java.util.Optional;
import java.util.Set;

import static io.trino.sql.planner.iterative.rule.Util.restrictChildOutputs;
import static io.trino.sql.planner.plan.Patterns.sample;

public class PruneSampleColumns
        extends ProjectOffPushDownRule
{
    public PruneSampleColumns()
    {
        super(sample());
    }

    @Override
    protected Optional pushDownProjectOff(Context context, SampleNode sampleNode, Set referencedOutputs)
    {
        return restrictChildOutputs(context.getIdAllocator(), sampleNode, referencedOutputs);
    }
}