/*
* We start with the large chunk iterator.
* The definition of the control statements require the same
* control variables, which means that the BATview is accessible
* to determine how far to advance when the next chunk is retrieved.
* The number of elements in the chunk is limited by the granule
* size.
*/
str
ITRnewChunk(lng *res, int *vid, int *bid, lng *granule)
{
BAT *b, *view;
BUN cnt, first;
if ((b = BATdescriptor(*bid)) == NULL) {
throw(MAL, "chop.newChunk", INTERNAL_BAT_ACCESS);
}
cnt = BATcount(b);
first = BUNfirst(b);
view = VIEWcreate_(b, b, TRUE);
/* printf("set bat chunk bound to " LLFMT " " BUNFMT " - " BUNFMT "\n",
*granule, first, MIN(cnt,(BUN) *granule)); */
VIEWbounds(b, view, (BUN) first, first + MIN(cnt, (BUN) * granule));
BATseqbase(view, b->hseqbase);
*vid = view->batCacheid;
BBPkeepref(view->batCacheid);
BBPunfix(b->batCacheid);
*res = first;
return MAL_SUCCEED;
}
BAT *
VIEWcreate(BAT *h, BAT *t)
{
return VIEWcreate_(h, t, FALSE);
}
