io.questdb.griffin.engine.join.AbstractJoinCursor Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 QuestDB
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 *  you may not use this file except in compliance with the License.
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 *
 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.join;

import io.questdb.cairo.sql.NoRandomAccessRecordCursor;
import io.questdb.cairo.sql.RecordCursor;
import io.questdb.cairo.sql.SymbolTable;
import io.questdb.std.Misc;

public abstract class AbstractJoinCursor implements NoRandomAccessRecordCursor {
    protected final int columnSplit;
    protected RecordCursor masterCursor;
    protected RecordCursor slaveCursor;

    public AbstractJoinCursor(int columnSplit) {
        this.columnSplit = columnSplit;
    }

    @Override
    public void close() {
        masterCursor = Misc.free(masterCursor);
        slaveCursor = Misc.free(slaveCursor);
    }

    @Override
    public SymbolTable getSymbolTable(int columnIndex) {
        if (columnIndex < columnSplit) {
            return masterCursor.getSymbolTable(columnIndex);
        }
        return slaveCursor.getSymbolTable(columnIndex - columnSplit);
    }

    @Override
    public SymbolTable newSymbolTable(int columnIndex) {
        if (columnIndex < columnSplit) {
            return masterCursor.newSymbolTable(columnIndex);
        }
        return slaveCursor.newSymbolTable(columnIndex - columnSplit);
    }
}