goodybag/mongo-sql — pull request #92 by jrf0110 (2014-04-09 03:41:34+00:00)
Title: Column expression parenthesis should optional

```javascript
columns: [
'createdAt'
, {
expression: '"createdAt" - lag( "createdAt" ) over w'
, alias: 'gap'
, parenthesis: false
}
]
```