columns.h

struct IColumn
        : public RefCounted<IColumn>, public IExpirable
{
        column_name name;
};

struct IColumnsContainer
        : public IColumn
{
        Vector<IColumn *, ReleaseRefDestructor> columns;

};


struct Column
    : public IColumn
{
        column_value    value;
        timestamp_t     timestamp;
        uint8_t         flags;
};


struct SuperColumn
    : public IColumnsContainer
{
        timestamp_t markedForDeletionTs;
        time32_t localDeletionTs;
        uint32_t size;  // memory footprint aggregate size for all columns
};

struct ColumnFamily
        : public IColumnsContainer
{
        friend class ColumnFamilyStore;

        timestamp_t markedForDeletionTs;
        time32_t localDeletionTs;
        uint32_t size;

        /*
         * Private to CloudDS service environment. Do not use in ClouDS client applications
         *
         */
        struct
        {
                uint8_t flags;

                inline bool IsTransient(void) const
                {
                        // Transient CFs are temporary; 
                        // we can safely modify their structure etc without having to first clone them 
                        // and subsequently operate on the clone
                        // Essentially, CFS not stored in Memtables are transients
                        return (flags&CF_PRIV_FLAGS_IMMUTABLE_STRUCTURE) == 0;
                }

        } _priv;

};