change Data.count to cache result as nrecords attribute
change Data.count to cache result as nrecords attribute

zhwa/thunder,broxtronix/thunder,zhwa/thunder,poolio/thunder,jwittenbach/thunder,j-friedrich/thunder,broxtronix/thunder,oliverhuangchao/thunder,mikarubi/thunder,j-friedrich/thunder,mikarubi/thunder,pearsonlab/thunder,oliverhuangchao/thunder,kunallillaney/thunder,thunder-project/thunder,pearsonlab/thunder,kcompher/thunder,kcompher/thunder,kunallillaney/thunder,poolio/thunder