Changeset: 4d61fcc1dc92 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=4d61fcc1dc92
Modified Files:
monetdb5/modules/mal/xid.c
Branch: xid
Log Message:
Encode oid-rebasing
When the oid to be stored does not fit, then simply switch to a new base.
This should deal with the case that fragmented oid sequences can not be
compressed.
diffs (82 lines):
diff --git a/monetdb5/modules/mal/xid.c b/monetdb5/modules/mal/xid.c
--- a/monetdb5/modules/mal/xid.c
+++ b/monetdb5/modules/mal/xid.c
@@ -37,6 +37,7 @@
#define XIDRANGEINC 3
#define XIDRANGEDEC 4
#define XIDRANGEEQ 5
+#define XIDBASE 6
/* must be <= XID_TAG_MAX */
typedef oid xid;
@@ -70,7 +71,13 @@ XIDencode(BUN *rtrn, XIDcolumn col, oid
//xid point=0, range=0,set=0;
o = *(oid*) p++;
- assert(o >= min);
+ //assert(o >= min);
+ //assert(o <= XID_VAL_MAX);
+ if ( o - min >= XID_VAL_MAX) {
+ col[i].x.tag = XIDBASE;
+ min= col[++i].count = o;
+ i++;
+ }
o -= min;
assert(o <= XID_VAL_MAX);
v = (xid) o;
@@ -80,7 +87,29 @@ XIDencode(BUN *rtrn, XIDcolumn col, oid
for ( ; p<q ; p++) {
o = *(oid*) p;
- assert(o >= min);
+ //assert(o >= min);
+ if ( o - min >= XID_VAL_MAX) {
+ switch( col[i].x.tag){
+ case XIDRANGEEQ:
+ case XIDRANGEINC:
+ case XIDRANGEDEC:
+ case XIDPOINT:
+ i++;
+ break;
+ case XIDSETINC:
+ case XIDSETDEC:
+ if (scnt == 1) { /* simplify decoding */
+ col[i].x.tag = XIDPOINT;
+ col[i].x.val = prev;
+ scnt =0;
+ }
+ /* finish the current*/
+ i++;
+ }
+ col[i].x.tag = XIDBASE;
+ min = col[i + 1].count = o;
+ i += 2;
+ }
o -= min;
assert(o <= XID_VAL_MAX);
v = (xid) o;
@@ -227,6 +256,13 @@ XIDencode(BUN *rtrn, XIDcolumn col, oid
//mnstr_printf(GDKout,"xidpoint " BUNFMT " "
XIDFMT "\n",i,v);
}
break;
+ case XIDBASE :
+ /* skip it and start a new point encoding */
+ i += 2;
+ col[i].x.tag = XIDPOINT;
+ col[i].x.val = v;
+ //mnstr_printf(GDKout,"xidpoint " BUNFMT " " XIDFMT
"\n",i,v);
+ break;
default:
throw(MAL, "xid.compress", "unknown col.x.tag in
XIDencode()");
}
@@ -517,6 +553,10 @@ XIDdecode(BUN *rtrn, XIDcolumn col, oid
throw(MAL, "xid.decompress", "XIDPOINT: result
BAT capacity exceeded in XIDdecode()");
*o++ = v + min;
break;
+ case XIDBASE:
+ o++;
+ min = *o++;
+ break;
default:
throw(MAL, "xid.decompress", "unknown col.x.tag in
XIDdecode()");
}
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