Elasticsearch: Added support for calendar_interval in ES date histogram queries (#75459)

* Introduce support for calendar intervals in ES date histogram queries

* Add missing undef type check for ES calendar interval query support

pkg/tsdb/elasticsearch/client/models.go

@@ -212,14 +212,20 @@ type HistogramAgg struct {
 
 // DateHistogramAgg represents a date histogram aggregation
 type DateHistogramAgg struct {
-	Field          string          `json:"field"`
-	FixedInterval  string          `json:"fixed_interval,omitempty"`
-	MinDocCount    int             `json:"min_doc_count"`
-	Missing        *string         `json:"missing,omitempty"`
-	ExtendedBounds *ExtendedBounds `json:"extended_bounds"`
-	Format         string          `json:"format"`
-	Offset         string          `json:"offset,omitempty"`
-	TimeZone       string          `json:"time_zone,omitempty"`
+	Field            string          `json:"field"`
+	FixedInterval    string          `json:"fixed_interval,omitempty"`
+	CalendarInterval string          `json:"calendar_interval,omitempty"`
+	MinDocCount      int             `json:"min_doc_count"`
+	Missing          *string         `json:"missing,omitempty"`
+	ExtendedBounds   *ExtendedBounds `json:"extended_bounds"`
+	Format           string          `json:"format"`
+	Offset           string          `json:"offset,omitempty"`
+	TimeZone         string          `json:"time_zone,omitempty"`
+}
+
+// GetCalendarIntervals provides the list of intervals used for building calendar bucketAgg
+func GetCalendarIntervals() []string {
+	return []string{"1w", "1M", "1q", "1y"}
 }
 
 // FiltersAggregation represents a filters aggregation

pkg/tsdb/elasticsearch/data_query.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"golang.org/x/exp/slices"
 
 	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/infra/log"
@@ -53,6 +54,7 @@ func (e *elasticsearchDataQuery) execute() (*backend.QueryDataResponse, error) {
 	from := e.dataQueries[0].TimeRange.From.UnixNano() / int64(time.Millisecond)
 	to := e.dataQueries[0].TimeRange.To.UnixNano() / int64(time.Millisecond)
 	for _, q := range queries {
+		fmt.Printf("Query = %v", q)
 		if err := e.processQuery(q, ms, from, to); err != nil {
 			mq, _ := json.Marshal(q)
 			e.logger.Error("Failed to process query to multisearch request builder", "error", err, "query", string(mq), "queriesLength", len(queries), "duration", time.Since(start), "stage", es.StagePrepareRequest)
@@ -160,22 +162,27 @@ func addDateHistogramAgg(aggBuilder es.AggBuilder, bucketAgg *BucketAgg, timeFro
 		field = timeField
 	}
 	aggBuilder.DateHistogram(bucketAgg.ID, field, func(a *es.DateHistogramAgg, b es.AggBuilder) {
-		a.FixedInterval = bucketAgg.Settings.Get("interval").MustString("auto")
+		var interval = bucketAgg.Settings.Get("interval").MustString("auto")
+		if slices.Contains(es.GetCalendarIntervals(), interval) {
+			a.CalendarInterval = interval
+		} else {
+			if interval == "auto" {
+				// note this is not really a valid grafana-variable-handling,
+				// because normally this would not match `$__interval_ms`,
+				// but because how we apply these in the go-code, this will work
+				// correctly, and becomes something like `500ms`.
+				// a nicer way would be to use `${__interval_ms}ms`, but
+				// that format is not recognized where we apply these variables
+				// in the elasticsearch datasource
+				a.FixedInterval = "$__interval_msms"
+			} else {
+				a.FixedInterval = interval
+			}
+		}
 		a.MinDocCount = bucketAgg.Settings.Get("min_doc_count").MustInt(0)
 		a.ExtendedBounds = &es.ExtendedBounds{Min: timeFrom, Max: timeTo}
 		a.Format = bucketAgg.Settings.Get("format").MustString(es.DateFormatEpochMS)
 
-		if a.FixedInterval == "auto" {
-			// note this is not really a valid grafana-variable-handling,
-			// because normally this would not match `$__interval_ms`,
-			// but because how we apply these in the go-code, this will work
-			// correctly, and becomes something like `500ms`.
-			// a nicer way would be to use `${__interval_ms}ms`, but
-			// that format is not recognized where we apply these variables
-			// in the elasticsearch datasource
-			a.FixedInterval = "$__interval_msms"
-		}
-
 		if offset, err := bucketAgg.Settings.Get("offset").String(); err == nil {
 			a.Offset = offset
 		}

pkg/tsdb/elasticsearch/data_query_test.go

@@ -1669,6 +1669,31 @@ func TestSettingsCasting(t *testing.T) {
 
 				assert.NotZero(t, dateHistogramAgg.FixedInterval)
 			})
+
+			t.Run("Uses calendar_interval", func(t *testing.T) {
+				c := newFakeClient()
+				_, err := executeElasticsearchDataQuery(c, `{
+					"bucketAggs": [
+						{
+							"type": "date_histogram",
+							"field": "@timestamp",
+							"id": "2",
+							"settings": {
+								"interval": "1M"
+							}
+						}
+					],
+					"metrics": [
+						{ "id": "1", "type": "average", "field": "@value" }
+					]
+				}`, from, to)
+				assert.Nil(t, err)
+				sr := c.multisearchRequests[0].Requests[0]
+
+				dateHistogramAgg := sr.Aggs[0].Aggregation.Aggregation.(*es.DateHistogramAgg)
+
+				assert.NotZero(t, dateHistogramAgg.CalendarInterval)
+			})
 		})
 	})
 
@@ -1755,6 +1780,21 @@ func TestSettingsCasting(t *testing.T) {
 			dateHistogramAgg := sr.Aggs[0].Aggregation.Aggregation.(*es.DateHistogramAgg)
 			assert.Equal(t, dateHistogramAgg.FixedInterval, "1d")
 		})
+
+		t.Run("Should use calendar_interval", func(t *testing.T) {
+			c := newFakeClient()
+			_, err := executeElasticsearchDataQuery(c, `{
+				"metrics": [{ "type": "count", "id": "1" }],
+				"bucketAggs": [
+					{ "type": "date_histogram", "id": "2", "field": "@time", "settings": { "min_doc_count": "1", "interval": "1w" } }
+				]
+			}`, from, to)
+
+			assert.Nil(t, err)
+			sr := c.multisearchRequests[0].Requests[0]
+			dateHistogramAgg := sr.Aggs[0].Aggregation.Aggregation.(*es.DateHistogramAgg)
+			assert.Equal(t, dateHistogramAgg.CalendarInterval, "1w")
+		})
 	})
 }