influxdb: influxql: explicit min-interval check (#38873)

* influxdb: influxql: explicit min-interval check

* added test

pkg/tsdb/influxdb/model_parser.go

@@ -3,6 +3,7 @@ package influxdb
 import (
 	"fmt"
 	"strconv"
+	"time"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana/pkg/components/simplejson"
@@ -44,6 +45,15 @@ func (qp *InfluxdbQueryParser) Parse(query backend.DataQuery) (*Query, error) {
 		return nil, err
 	}
 
+	interval := query.Interval
+
+	// we make sure it is at least 1 millisecond
+	minInterval := time.Millisecond
+
+	if interval < minInterval {
+		interval = minInterval
+	}
+
 	return &Query{
 		Measurement:  measurement,
 		Policy:       policy,
@@ -52,7 +62,7 @@ func (qp *InfluxdbQueryParser) Parse(query backend.DataQuery) (*Query, error) {
 		Tags:         tags,
 		Selects:      selects,
 		RawQuery:     rawQuery,
-		Interval:     query.Interval,
+		Interval:     interval,
 		Alias:        alias,
 		UseRawQuery:  useRawQuery,
 		Tz:           tz,

pkg/tsdb/influxdb/model_parser_test.go

@@ -175,4 +175,23 @@ func TestInfluxdbQueryParser_Parse(t *testing.T) {
 		require.Empty(t, res.Tags)
 		require.Equal(t, time.Second*10, res.Interval)
 	})
+
+	t.Run("will enforce a minInterval of 1 millisecond", func(t *testing.T) {
+		json := `
+      {
+        "query": "RawDummyQuery",
+        "rawQuery": true,
+        "resultFormat": "time_series"
+      }
+      `
+
+		query := backend.DataQuery{
+			JSON:     []byte(json),
+			Interval: time.Millisecond * 0,
+		}
+
+		res, err := parser.Parse(query)
+		require.NoError(t, err)
+		require.Equal(t, time.Millisecond*1, res.Interval)
+	})
 }