Re: Fix for seg picksplit function
Alexander Korotkov <aekorotkov@gmail.com>
From: Alexander Korotkov <aekorotkov@gmail.com>
To: Yeb Havinga <yebhavinga@gmail.com>
Cc: Alvaro Herrera <alvherre@commandprompt.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2010-11-10T14:46:25Z
Lists: pgsql-hackers
On Wed, Nov 10, 2010 at 5:37 PM, Yeb Havinga <yebhavinga@gmail.com> wrote: > They are necessary and it is code untouched by this patch, and the same > line occurs in other picksplit functions as well. The gbt_num_picksplit > function shows that it can be avoided, by rewriting in the second loop > > *left++ = sortItems[i].index; > into > v->spl_left[v->spl_nleft] = sortItems[i].index > > Even though this is longer code, I prefer this variant over the shorter > one. > I can't understand this point. How the way of spl_left and spl_right arrays filling is related with additional FirstOffsetNumber value at the end of array, which is added by "*left = *right = FirstOffsetNumber;" line? ---- With best regards, Alexander Korotkov.