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QuestDB is High Performance Time Series Database

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package com.questdb.ql;

import com.questdb.factory.configuration.RecordColumnMetadata;
import com.questdb.ql.impl.map.DirectMapValues;
import com.questdb.std.ObjList;

public interface AggregatorFunction {

    void calculate(Record rec, DirectMapValues values);

    void clear();

    void prepare(ObjList columns, int offset);
}