func isEmptyValue(v schema.Value) bool {
if !v.IsValid() {
return false
}
switch v.Which() {
case schema.Value_Which_text:
b, _ := v.TextBytes()
return len(b) == 0
case schema.Value_Which_data:
b, _ := v.Data()
return len(b) == 0
case schema.Value_Which_list:
p, _ := v.ListPtr()
return p.List().Len() == 0
default:
return false
}
}
