Changeset: a153b001d0b2 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=a153b001d0b2
Modified Files:
gdk/gdk_imprints.c
Branch: Oct2014
Log Message:
Added some comments.
diffs (19 lines):
diff --git a/gdk/gdk_imprints.c b/gdk/gdk_imprints.c
--- a/gdk/gdk_imprints.c
+++ b/gdk/gdk_imprints.c
@@ -662,9 +662,12 @@ BATimprints(BAT *b)
imprints->imprints->farmid = BBPselectfarm(TRANSIENT, b->ttype,
imprintsheap);
/* The heap we create here consists of three parts:
- * bins, max 64 entries with bin boundaries;
- * imps;
- * dict. */
+ * bins, max 64 entries with bin boundaries, domain of b;
+ * imps, max one entry per "page", entry is "bits" wide;
+ * dict, max two entries per three "pages".
+ * In addition, we add some housekeeping entries at
+ * the start so that we can determine whether we can
+ * trust the imprints when encountered on startup. */
if (HEAPalloc(imprints->imprints,
64 * b->T->width +
pages * (imprints->bits / 8) +
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