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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
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.facebook.presto.operator.index;
public interface IndexedData
        extends Closeable
    public static final long UNLOADED_INDEX_KEY = -2;
    public static final long NO_MORE_POSITIONS = -1;

Returns UNLOADED_INDEX_KEY if the key has not been loaded. Returns NO_MORE_POSITIONS if the key has been loaded, but has no values. Returns a valid address if the key has been loaded and has values.
    long getJoinPosition(int positionPage page);

Returns the next address to join. Returns NO_MORE_POSITIONS if there are no more values to join.
    long getNextJoinPosition(long currentPosition);
    void appendTo(long positionPageBuilder pageBuilderint outputChannelOffset);
    void close();
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