@menu
* Adding New Vector Distances
* Adding New Vecset Distances
* Adding New Indices and Sketches
* Supporting New Data Types
@end menu

@anchor{x-extend}

@node Adding New Vector Distances
@section Adding New Vector Distances

@smallexample
typedef cass_dist_t (*cass_vec_dist_func_t) (cass_size_t n, void *, void *, void *);

typedef struct _cass_vec_dist_class @{
        char *name;
        cass_vec_type_t vec_type;
        cass_vec_dist_type_t type;
        cass_vec_dist_func_t dist;
        /* void ** is actually cass_vec_dist_t ** */
        int (*describe) (void *, CASS_FILE *);
        int (*construct) (void **, const char *);
        int (*checkpoint) (void *, CASS_FILE *);
        int (*restore) (void **, CASS_FILE *);
        void (*free) (void *);
@} cass_vec_dist_class_t;

typedef struct @{
        uint32_t refcnt;
        char *name;
        cass_vec_dist_class_t *class;
        /* private data... */
@} cass_vec_dist_t;

@end smallexample

@node Adding New Vecset Distances
@section Adding New Vecset Distances

@smallexample
typedef cass_dist_t (*cass_vecset_dist_func_t) (cass_dataset_t *, cass_vecset_id_t,
                cass_dataset_t *, cass_vecset_id_t , cass_vec_dist_t *vec_dist, void *);

typedef struct _cass_vecset_dist_class@{
        char *name;
        cass_vecset_type_t vecset_type;
        cass_vecset_dist_type_t type;
        cass_vecset_dist_func_t dist;
        /* void ** is actually cass_vecset_dist_t ** */
        int (*describe) (void *, CASS_FILE *);
        int (*construct) (void **, const char *);
        int (*checkpoint) (void *, CASS_FILE *);
        int (*restore) (void **, CASS_FILE *);
        void (*free) (void *);
        /* private data... */
@} cass_vecset_dist_class_t;

typedef struct @{
        uint32_t refcnt;
        char *name;
        int32_t vec_dist;
        cass_vecset_dist_class_t *class;
@} cass_vecset_dist_t;

@end smallexample

@node Adding New Indices and Sketches
@section Adding New Indices and Sketches

@smallexample
typedef struct _cass_table_opr cass_table_opr_t;
/*    table operations */

typedef int cass_table_init_private_t (cass_table_t *table,  // See management section
                                const char *param);

typedef int cass_table_opr_describe_t (cass_table_opr_t *table, CASS_FILE *out);

typedef int cass_table_checkpoint_private_t (cass_table_t *table, CASS_FILE *out);

typedef int cass_table_restore_private_t (cass_table_t *table, CASS_FILE *in);

typedef int cass_table_load_t (cass_table_t *table);  // bring data in mem

typedef int cass_table_release_t (cass_table_t *table);  // release in-mem vecsets.

typedef int cass_table_batch_insert_t (cass_table_t *table, cass_dataset_t *dataset,
                cass_vecset_id_t start, cass_vecset_id_t end);

typedef int cass_table_query_t(cass_table_t *table, 
        cass_query_t *query, cass_result_t *result);

typedef int cass_table_batch_query_t(cass_table_t *table, 
        uint32_t count, cass_query_t **queries, cass_result_t **results);

typedef int cass_table_drop_t(cass_table_t *table);

typedef int cass_table_free_private_t(cass_table_t *table);

typedef char *cass_table_tune_t(cass_table_t *parent, char *extra_input);

struct _cass_table_opr @{
    char *name;
    // CASS_DATA or CASS_SKETCH or CASS_INDEX, CASS_OUTOFCORE, CASS_SEQUENTIAL
    int type;
    cass_vecset_type_t                vecset_type;
    cass_vec_type_t                   vec_type;
    cass_vecset_dist_type_t           dist_vecset;
    cass_vec_dist_type_t              dist_vec;

    cass_table_tune_t                *tune; // a set of function pointers.
    cass_table_init_private_t        *init_private;
    cass_table_batch_insert_t        *batch_insert;
    cass_table_query_t               *query;
    cass_table_batch_query_t         *batch_query;
    cass_table_load_t                *load; // load data
    cass_table_release_t             *release; // release data
    cass_table_checkpoint_private_t  *checkpoint_private;
    cass_table_restore_private_t     *restore_private;
    cass_table_free_private_t        *free_private;
    cass_table_opr_describe_t        *describe; // load data
@};


@end smallexample

@node Supporting New Data Types
@section Supporting New Data Types