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SQL: Fixes issues with showing value column name prefix in legends (#35839)

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* rename strategy

* Update pkg/tsdb/sqleng/sql_engine.go

Co-authored-by: Torkel Ödegaard <torkel@grafana.org>

* more strict constraints

* Fixed so that it works on multi series results

* only apply the logic when original query returns 3 fields

* removed part of comment

* Update mysql test

Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
This commit is contained in:
Ryan McKinley
2021-06-17 23:05:23 -07:00
committed by GitHub
parent 941936cf97
commit 1d6e99bc95
3 changed files with 20 additions and 4 deletions
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16
pkg/tsdb/sqleng/sql_engine.go
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@ -298,11 +298,27 @@ func (e *dataPlugin) executeQuery(query plugins.DataSubQuery, wg *sync.WaitGroup
tsSchema := frame.TimeSeriesSchema()
if tsSchema.Type == data.TimeSeriesTypeLong {
var err error
originalData := frame
frame, err = data.LongToWide(frame, qm.FillMissing)
if err != nil {
errAppendDebug("failed to convert long to wide series when converting from dataframe", err, interpolatedQuery)
return
}
// Before 8x, a special metric column was used to name time series. The LongToWide transforms that into a metric label on the value field.
// But that makes series name have both the value column name AND the metric name. So here we are removing the metric label here and moving it to the
// field name to get the same naming for the series as pre v8
if len(originalData.Fields) == 3 {
for _, field := range frame.Fields {
if len(field.Labels) == 1 { // 7x only supported one label
name, ok := field.Labels["metric"]
if ok {
field.Name = name
field.Labels = nil
}
}
}
}
}
if qm.FillMissing != nil {
var err error