SetOperation.java

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package org.apache.doris.nereids.trees.plans.algebra;

import org.apache.doris.nereids.trees.expressions.NamedExpression;
import org.apache.doris.nereids.trees.expressions.SlotReference;

import java.util.List;

/**
 * Common interface for logical/physical SetOperation.
 */
public interface SetOperation {
    /**
     * SetOperation qualifier type.
     */
    enum Qualifier {
        ALL,
        DISTINCT
    }

    Qualifier getQualifier();

    List<SlotReference> getRegularChildOutput(int i);

    List<NamedExpression> getOutputs();

    List<List<SlotReference>> getRegularChildrenOutputs();

    int getArity();
}