metamx/druid — pull request #940 by flowbehappy (2014-12-08 08:30:50+00:00)
Title: Added asNumber to OrderByColumnSpec

This commit make dimension can be sorted numerically(only "long" here) besides lexicographically. e.g
```
query:
...
"dimensions": [
"id",
],
"limitSpec": {
"type": "default",
"limit": 20,
"columns": [
{
"asNumber": true,
"dimension": "id",
"direction": "DESCENDING"
}
]
},
...

result:
id	name	score
0	alias	90
1	bob	75
2	joe	60
11	flow	88
14	kevin	54
```