/*
* __wt_btcur_next_random --
* Move to a random record in the tree.
*/
int
__wt_btcur_next_random(WT_CURSOR_BTREE *cbt)
{
WT_BTREE *btree;
WT_DECL_RET;
WT_SESSION_IMPL *session;
WT_UPDATE *upd;
session = (WT_SESSION_IMPL *)cbt->iface.session;
btree = cbt->btree;
/*
* Only supports row-store: applications can trivially select a random
* value from a column-store, if there were any reason to do so.
*/
if (btree->type != BTREE_ROW)
WT_RET(ENOTSUP);
WT_STAT_FAST_CONN_INCR(session, cursor_next);
WT_STAT_FAST_DATA_INCR(session, cursor_next);
WT_RET(__cursor_func_init(cbt, 1));
WT_ERR(__wt_row_random(session, cbt));
if (__cursor_valid(cbt, &upd))
WT_ERR(__wt_kv_return(session, cbt, upd));
else
WT_ERR(__wt_btcur_search_near(cbt, 0));
err: if (ret != 0)
WT_TRET(__cursor_reset(cbt));
return (ret);
}
/*
* __curfile_search_near --
* WT_CURSOR->search_near method for the btree cursor type.
*/
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
WT_CURSOR_BTREE *cbt;
WT_DECL_RET;
WT_SESSION_IMPL *session;
cbt = (WT_CURSOR_BTREE *)cursor;
CURSOR_API_CALL(cursor, session, search_near, cbt->btree);
WT_CURSOR_NEEDKEY(cursor);
ret = __wt_btcur_search_near(cbt, exact);
err: API_END(session);
return (ret);
}
/*
* __curfile_search_near --
* WT_CURSOR->search_near method for the btree cursor type.
*/
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
WT_CURSOR_BTREE *cbt;
WT_DECL_RET;
WT_SESSION_IMPL *session;
cbt = (WT_CURSOR_BTREE *)cursor;
CURSOR_API_CALL(cursor, session, search_near, cbt->btree);
WT_CURSOR_NEEDKEY(cursor);
WT_CURSOR_NOVALUE(cursor);
WT_BTREE_CURSOR_SAVE_AND_RESTORE(
cursor, __wt_btcur_search_near(cbt, exact), ret);
err: API_END_RET(session, ret);
}
/*
* __curfile_search_near --
* WT_CURSOR->search_near method for the btree cursor type.
*/
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
WT_CURSOR_BTREE *cbt;
WT_DECL_RET;
WT_SESSION_IMPL *session;
cbt = (WT_CURSOR_BTREE *)cursor;
CURSOR_API_CALL(cursor, session, search_near, cbt->btree);
WT_ERR(__cursor_checkkey(cursor));
WT_ERR(__wt_btcur_search_near(cbt, exact));
/* Search-near maintains a position, key and value. */
WT_ASSERT(session,
F_MASK(cursor, WT_CURSTD_KEY_SET) == WT_CURSTD_KEY_INT &&
F_MASK(cursor, WT_CURSTD_VALUE_SET) == WT_CURSTD_VALUE_INT);
err: API_END_RET(session, ret);
}