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QuestDB is High Performance Time Series Database

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package com.questdb.query.spi;

import com.questdb.Journal;
import com.questdb.query.api.QueryHead;
import com.questdb.query.api.QueryHeadBuilder;

public class QueryHeadImpl implements QueryHead {
    private final Journal journal;

    public QueryHeadImpl(Journal journal) {
        this.journal = journal;
    }

    @Override
    public QueryHeadBuilder withKeys(String... values) {
        return withSymValues(journal.getMetadata().getKeyColumn(), values);
    }

    @Override
    public QueryHeadBuilder withSymValues(String symbol, String... values) {
        QueryHeadBuilderImpl impl = new QueryHeadBuilderImpl<>(journal);
        impl.setSymbol(symbol, values);
        return impl;
    }
}