Change InfluxDB SQL generation template to wrap column names in quoutes

[jbripley]

Since column names can contain dots or dashes, which will give syntax errors from InfluxDB API, unless wrapped in quotes.

[torkelo]

Thanks! This should solve issue #348

[mavimo]

This totally break InfluxDB:

marco@nebula ~/Development/grafana   $ influxdb -v
InfluxDB v0.5.8 (git: 1b2bca57041e583930f84d66d633d7ff3cf38ace) (leveldb: 1.15)

With quoted query:

http://localhost:8086/db/test/series?p=root&u=root&q=select+count(%22statuscode%22)+as+%22statuscode_count%22+from+accesslog+where++time+%3E+1394948146s+and+time+%3C+1394991671s+group+by+time(30s)+order+asc

generate:

syntax error, unexpected $undefined

             ^

without double quote it work as expected

[jbripley]

Oh, I've only tested this fix with InfluxDB 0.5.9 and later (0.5.11 specifically). It's unfortunate that earlier versions break when sent this syntax and I'm a bit surprised since this was the solution suggested by the InfluxDB devs.

The only option I see is making the column name quoting configurable, to handle earlier InfluxDB versions.

[torkelo]

Not good... hmm is there a http api to query influxdb version? Might be good to have a version check at application boot to feature toggle some features.