davidchambers opened a new issue, #5582:
URL: https://github.com/apache/couchdb/issues/5582
I have three documents in my database:
- `{"name": "foo"}`
- `{"name": "bar"}`
- `{"name": "baz"}`
I ran the following Mango query:
```json
{
"selector": {
"name": {
"$and": []
}
}
}
```
I expected all three documents to be returned, due to [vacuous truth][1].
Instead, no documents were returned.
I investigated and found code for handling [empty `$and`][2] and [empty
`$or`][3]:
```erlang
match({[{<<"$and">>, []}]}, _, _) ->
true;
```
```erlang
match({[{<<"$or">>, []}]}, _, _) ->
true;
```
Confusingly, it's actually the `$or` code that looks wrong to me. :thinking:
[1]: https://en.wikipedia.org/wiki/Vacuous_truth
[2]:
https://github.com/apache/couchdb/blob/3.5.0/src/mango/src/mango_selector.erl#L367-L368
[3]:
https://github.com/apache/couchdb/blob/3.5.0/src/mango/src/mango_selector.erl#L372-L373
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