Issue: Fix PR #78 bug. It will produce multiple same datapoints when arithmetic over datapoints with groupby along with datapoints without groupby. I fix this bug in this PR.
Datasource: Elasticsearch(No testing for other datasource)
Attention: Only support for alias pattern {{term fieldname}}.
Issue: Fix PR #78 bug. It will produce multiple same datapoints when arithmetic over datapoints with groupby along with datapoints without groupby. I fix this bug in this PR. Datasource: Elasticsearch(No testing for other datasource) Attention: Only support for alias pattern {{term fieldname}}.![Selection_013](https://user-images.githubusercontent.com/18626159/66999353-6fd87580-f108-11e9-8027-c7f20ddca3a1.png)