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Create a well-defined, cross-language specification for data compute operations

There is a newer version: 0.46.1

package io.substrait.relation;

import java.util.Collections;
import java.util.List;

public abstract class SingleInputRel extends AbstractRel {

  public abstract Rel getInput();

  @Override
  public final List getInputs() {
    return Collections.singletonList(getInput());
  }
}