Github user tonysun83 commented on the issue:
https://github.com/apache/couchdb-couch/pull/229
This is what it looks like now:
```
{
"rows": [
{
"error": "builtin_reduce_error",
"reason": "The _sum function requires that map values be
numbers, arrays of numbers, or objects, not. Objects cannot be mixed with other
data structures. Objects can be arbitrarily nested, provided that the values
for all fields are themselves numbers, arrays of numbers, or objects.",
"cause_by": [
{
"a": 1
},
{
"a": 2
},
{
"a": 3
},
{
"a": 4
}
]
}
]
}
```
Also added https://github.com/apache/couchdb-couch-mrview/pull/66
and https://github.com/apache/couchdb-fabric/pull/90 to support this change.
Hopefully this is the right approach.
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