// set the fields of the other time series to null making sure that
// the order of the null values match the order of the field
// definitions, i.e. left timeseries first followed by values from the
// right timeseries
func (self *mergeState) getPoint(fields []string, p *protocol.Point) *protocol.Point {
if !self.modifyValues {
return p
}
newValues := make([]*protocol.FieldValue, len(self.fields))
oldValues := p.Values
for idx, f := range fields {
newIdx := self.fields[f]
newValues[newIdx] = oldValues[idx]
}
p.Values = newValues
return p
}
func filterColumns(columns map[string]struct{}, fields []string, point *protocol.Point) {
if _, ok := columns["*"]; ok {
return
}
newValues := []*protocol.FieldValue{}
newFields := []string{}
for idx, f := range fields {
if _, ok := columns[f]; !ok {
continue
}
newValues = append(newValues, point.Values[idx])
newFields = append(newFields, f)
}
point.Values = newValues
}