Github user tonysun83 commented on the issue:
https://github.com/apache/couchdb-couch/pull/229
@iilyak : The only two error types I can think of are when the input value
is invalid and also what @kxepal mentioned (the map function errors) which I
forgot to take care of. In any case, I think if there are multiple reduces,
then there would be multiple error rows per reduce call
```
{
"rows": [
{
"key": null,
"value": {
"key": [],
"value": <some_value>
"builtin_reduce_error":...."
},
{
"key": null,
"value": {
"key": [],
"value": <some_value>
"builtin_reduce_error":...."
},
]
}
```
What about the following response format:
```
{
"rows": [
{
"key": null,
"value": {
"error": {"builtin_reduce_error": { "key" : <some_key>,
"value": <some_value>}
},
]
}
```
So if it is from a map function then it would be:
```
{
"rows": [
{
"key": null,
"value": {
"error": {"builtin_reduce_error": { "key" : 1, "value":
"not_found"}
},
]
}
```
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