unsupported value: +Inf" error not handled gracefully

[davidby-influx]

JSON marshalling errors should be returned as properly formatted JSON errors.

Steps to reproduce:

> create database db
> use db
Using database db
> insert m v=1.7976931348623157E308
> insert m v=1.7976931348623157E308
> 
> select * from m
name: m
time                v
----                -
1604428620720870437 1.7976931348623157e+308
1604428621584887557 1.7976931348623157e+308

> select sum(v) from m
ERR: 
> exit
$ curl "http://localhost:8086/query?db=EAR1834" --data-urlencode "q=select sum(v) from m"  

Expected behavior:

$ curl "http://localhost:8086/query?db=EAR1834" --data-urlencode "q=select sum(v) from m"  
{"error":"json: unsupported value: +Inf"}

Actual behavior:

$ curl "http://localhost:8086/query?db=db" --data-urlencode "q=select sum(v) from m"  
json: error calling MarshalJSON for type httpd.Response: json: error calling MarshalJSON for type *query.Result: json: unsupported value: +Inf

Environment info:

• v1.8.3

[davidby-influx]

Pushed.

ttps://github.com//pull/20250