pydata/pandas — pull request #5568 by jreback (2013-11-21 21:42:56+00:00)
Title: PERF: slow conversion of single series to data frame

```

-------------------------------------------------------------------------------
Test name | head[ms] | base[ms] | ratio |
-------------------------------------------------------------------------------
frame_from_series | 0.1043 | 17.8473 | 0.0058 |
```

an oversight in handling a case like:

``DataFrame(a_series)``