jcoglan commented on issue #3773:
URL: https://github.com/apache/couchdb/issues/3773#issuecomment-937846761
It's also interesting that querying the view without `keys` lists two rows
with `q=2`:
```
See what is in the view
00000000 7b 22 72 6f 77 73 22 3a 5b 0d 0a 7b 22 6b 65 79
|{"rows":[..{"key|
00000010 22 3a 5b 22 66 69 6c 65 22 2c 22 63 68 61 c3 ae
|":["file","cha..|
00000020 6e 65 22 5d 2c 22 76 61 6c 75 65 22 3a 31 7d 2c
|ne"],"value":1},|
00000030 0d 0a 7b 22 6b 65 79 22 3a 5b 22 66 69 6c 65 22
|..{"key":["file"|
00000040 2c 22 63 68 61 69 cc 82 6e 65 22 5d 2c 22 76 61
|,"chai..ne"],"va|
00000050 6c 75 65 22 3a 31 7d 0d 0a 5d 7d 0a |lue":1}..]}.|
0000005c
```
... but only a single row with `q=1`. The row returned has key bytes `c3 ae`
representing codepoint U+00EE.
```
See what is in the view
00000000 7b 22 72 6f 77 73 22 3a 5b 0d 0a 7b 22 6b 65 79
|{"rows":[..{"key|
00000010 22 3a 5b 22 66 69 6c 65 22 2c 22 63 68 61 c3 ae
|":["file","cha..|
00000020 6e 65 22 5d 2c 22 76 61 6c 75 65 22 3a 32 7d 0d
|ne"],"value":2}.|
00000030 0a 5d 7d 0a |.]}.|
00000034
```
So it does seem as though if these two rows are stored in the same shard,
their keys are considered equal and they get merged, but not if they're
(potentially) stored in different shards.
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