id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
1482	DVO mextract null vectors	ndeacon	eugene	"mextract seems to return a one entry vector instead of a null vector when no
matches are found. The vector's entry is the first entry of a previous
vector of the same name. See commands below,

dvo: catdir  /data/ipp022.0/ndeacon/hispeedzy-feb11
dvo: skyregion 190 191 -2 -1
dvo: avextract ra dec
dvo: echo ra[0]
190.028796778
dvo: echo ra[]
108
dvo: skyregion 190 191 -62 -61
dvo: mextract ra dec where (y>0.0)
dvo: echo ra[0]
190.028796778
dvo: echo ra[]
1

The bug does not appear to be present in avextract,

dvo: catdir  /data/ipp022.0/ndeacon/hispeedzy-feb11
dvo: skyregion 190 191 -2 -1
dvo: avextract ra dec
dvo: echo ra[0]
190.028796778
dvo: echo ra[]
108
dvo: skyregion 190 191 -62 -61
dvo: avextract ra dec where (y>0.0)
dvo: echo ra[]
0
"	defect	new	low		DVO	unspecified	minor		DVO