Cryptic error coming from Druid SQL in semi-join condition

### Affected Version

0.16.0-snapshot

### Description

The query

```sql
SELECT
"segment_id", "datasource", "start", "end"
FROM sys.segments
WHERE
"start" IN (
SELECT "start"
FROM sys.segments
WHERE "datasource" = 'wikiticker'
GROUP BY 1
LIMIT 5
)
AND "datasource" = 'wikiticker'
ORDER BY "start" DESC
LIMIT 100
```

Produces this cryptic error:

`Unknown exception / Got a sink null to which there is no match source type! / java.lang.IllegalStateException`

But strangely removing the `datasource` filter clause in the outer SQL makes it all work:


As it stands right now this is a release blocker for 0.16.0 as this type of query is generated by a feature added to the web console. To unblock we could do one of:

1. Fix this issue
2. Remove/hide the 'group by interval' feature in the segments view
3. Change how that view fetches data (make it make two calls)

2 or 3 are very simple to do but wanted to get some discussion going on weather we should do 1.

Reproduce the reported query against Druid 0.16.0-snapshot, comparing the version with and without the outer datasource filter. Trace the semi-join path that produces the “sink null” IllegalStateException; done means the query no longer returns the cryptic error, or the segments-view workaround is clearly selected and verified.

Written by the indexing model from the issue text.