picksplit algorithm - Mailing list pgsql-hackers

<pre><font size="4">In rtree_gist.c <br />postgresql version 8.0.9<br /><br />maxoff = entryvec->n - 1;<br />nbytes
=(maxoff + 2) * sizeof(OffsetNumber);<br />listL = (OffsetNumber *) palloc(nbytes);<br /><br /></font><font><font
size="4">
why the maximun offset is set to entryvec->n-1 ?<br /><br />why nbytes is set to maxoff + 2 ?<br /><br />I hope you
canhelp me<br />regards <br />jorge<br /><br /></font></font><br /></pre>