presto-main/src/main/java/io/prestosql/operator/JoinHash.java/JoinHash/getJoinPosition
class JoinHash:    @Override
    public long getJoinPosition(int position, Page hashChannelsPage, Page allChannelsPage, long rawHash)
    {
        int addressIndex = pagesHash.getAddressIndex(position, hashChannelsPage, rawHash);
        return startJoinPosition(addressIndex, position, allChannelsPage);
    }