fix the decode bug in NumpyArrayDecoder, get WeldVec by using ptr field
fix the decode bug in NumpyArrayDecoder, get WeldVec by using ptr field

rahulpalamuttam/weld,rahulpalamuttam/weld,rahulpalamuttam/weld,sppalkia/weld,weld-project/weld,sppalkia/weld,rahulpalamuttam/weld,rahulpalamuttam/weld,weld-project/weld,weld-project/weld,sppalkia/weld,weld-project/weld,sppalkia/weld,sppalkia/weld,weld-project/weld