[GitHub] [incubator-superset] astudnev opened issue #6057: Metrics are not properly added in My Metric

[GitHub]

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### Superset version


### Expected results

I add a metric and it is appended to query and displayed on graph

### Actual results

Instead, it adds ONLY count() with different names 

In query it looks as

```
SELECT toStartOfDay(toDateTime(tx_time)) AS __timestamp,
       count() AS "COUNT_DISTINCT(tx_hash)",
```

instead of

```
SELECT toStartOfDay(toDateTime(tx_time)) AS __timestamp,
       COUNT_DISTINCT(tx_hash) AS my_metric_XXX,
```


### Steps to reproduce

Add a metric to a time series graph as shown on picture attached


<img width="595" alt="mymetri" 
src="https://user-images.githubusercontent.com/1385046/46603771-cde97a80-cafc-11e8-8221-2d77953e971c.png";>


[ Full content available at: 
https://github.com/apache/incubator-superset/issues/6057 ]
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