the original code cant visit the last element of the"parts" array.
so the v[v.length–1] always equals 0

## What changes were proposed in this pull request?
change the recycle range from (1 to parts.length-1) to (1 to parts.length)

## How was this patch tested?

debug it in eclipse (´〜｀*) zzz.

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: junzhi lu <452756565@qq.com>

Closes #18237 from masterwugui/patch-1.