Changeset: 946e680dd69f for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=946e680dd69f
Modified Files:
gdk/gdk_batop.mx
Branch: default
Log Message:
Adjust the sampling strategy
Use the new sampling strategy which avoids a local clustering of values.
It has been proofed good results in sf-10 overall. The critical Q18
als benefitted with about 20%.
diffs (13 lines):
diff --git a/gdk/gdk_batop.mx b/gdk/gdk_batop.mx
--- a/gdk/gdk_batop.mx
+++ b/gdk/gdk_batop.mx
@@ -1248,7 +1248,8 @@ BAT_select_(BAT *b, const void *tl, cons
BAT *tmp1;
ALGODEBUG THRprintf(GDKout, "#BAT_select_(b=%s): sampling: tmp1
= BATslice(b=%s, _lo=" BUNFMT ", _hi=" BUNFMT ");\n", BATgetId(b), BATgetId(b),
_lo, _hi);
- tmp1 = BATslice(b, _lo, _hi); /* slice keeps all parent
properties */
+ //tmp1 = BATslice(b, _lo, _hi); /* slice keeps all parent
properties */
+ tmp1 = BATsample(b, 128);
if (tmp1) {
BAT *tmp2;
ALGODEBUG THRprintf(GDKout, "#BAT_select_(b=%s):
sampling: tmp2 = BAT_select_(tmp1=%s, tl, th, tail);\n", BATgetId(b),
BATgetId(tmp1));
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