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In case of empty query results, return an empty matrix.

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This commit is contained in:
Julius Volz 2013-03-25 12:14:48 +01:00
parent 43a7ccd5be
commit 3880a86c9c
1 changed files with 4 additions and 2 deletions
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6
rules/ast/ast.go
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@ -257,16 +257,18 @@ func labelsToKey(labels model.Metric) string {
func EvalVectorInstant(node VectorNode, timestamp time.Time) (vector Vector) { func EvalVectorInstant(node VectorNode, timestamp time.Time) (vector Vector) {
viewAdapter, err := viewAdapterForInstantQuery(node, timestamp) viewAdapter, err := viewAdapterForInstantQuery(node, timestamp)
if err != nil { if err != nil {
// TODO: propagate errors.
return return
} }
return node.Eval(&timestamp, viewAdapter) return node.Eval(&timestamp, viewAdapter)
} }
func EvalVectorRange(node VectorNode, start time.Time, end time.Time, interval time.Duration) (matrix Matrix, err error) { func EvalVectorRange(node VectorNode, start time.Time, end time.Time, interval time.Duration) (matrix Matrix, err error) {
// Explicitly initialize to an empty matrix since a nil Matrix encodes to
// null in JSON.
matrix = Matrix{}
viewAdapter, err := viewAdapterForRangeQuery(node, start, end, interval) viewAdapter, err := viewAdapterForRangeQuery(node, start, end, interval)
if err != nil { if err != nil {
// TODO: propagate errors.
return return
} }
// TODO implement watchdog timer for long-running queries. // TODO implement watchdog timer for long-running queries.