err = msgp.WrapError(err, "lastUpdate")
				return
			}
		case "b":
			z.bucket, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "bucket")
				return
			}
		case "flt":
			z.filter, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "filter")
				return
			}
		case "id":
			z.id, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "id")

	res := make([]Value, len(e.Elements))
	if len(e.Elements) == 1 {
		// If length 1, treat as single value.
		return e.Elements[0].evalNode(r, tableAlias)
	}
	for i, elt := range e.Elements {
		v, err := elt.evalNode(r, tableAlias)
		if err != nil {
			return nil, err
		}
		res[i] = *v
	}
	return FromArray(res), nil
}

const floatCmpTolerance = 0.000001