GROUP BY / HAVING fails to return results

[dweber]

Ubuntu 12.04 is running on Travis.ci with sqlite 3.7.9 and that's where we ran into this bug (see https://github.com/travis-ci/travis-ci/issues/6406).

On sqlite3 3.6.20 (and likely the version on Travis, which is 3.7.9, but not on 3.7.17):

```
sqlite> SELECT * FROM ingests;
id ingest_id bag_id ingested created_at
---------- ------------------------------------ ---------- ---------- --------------------------
1 99bb3c9c-79b8-4fb4-bd16-91273a9485c4 1 f 2016-08-03 22:39:37.173484
2 06ac1f23-73a0-4185-9ce8-a3bb33079e68 1 t 2016-08-03 19:39:56.164517
3 308d53c9-a30d-403e-b7d9-182cdd22b33a 2 f 2016-08-03 18:40:20.198619
4 03f98430-c9b7-4500-aae8-4e3fcecdd56b 2 t 2016-08-02 20:40:38.293054
sqlite> SELECT * FROM ingests GROUP BY bag_id HAVING created_at = max(created_at);
sqlite> # wtf?
```

When using sqlite 3.13.0 it returns results, i.e.

```
sqlite> SELECT * FROM ingests GROUP BY bag_id HAVING created_at = max(created_at);
id ingest_id bag_id ingested created_at
---------- ------------------------------------ ---------- ---------- --------------------------
1 99bb3c9c-79b8-4fb4-bd16-91273a9485c4 1 f 2016-08-03 22:39:37.173484
3 308d53c9-a30d-403e-b7d9-182cdd22b33a 2 f 2016-08-03 18:40:20.198619
```