CouchDB查看模式匹配在密鑰中組合數字和Alpha

Question

迄今爲止，我在couchdb中創建的所有視圖都使用了數字值。向鍵添加字母字符時，我感到有點意外。

我的觀點是返回值如預期：

[2011,12,5,14,22,"foo"] 
[2011,12,5,14,23,"foo"] 
[2011,12,5,14,42,"bar"] 
[2011,12,5,15,2,"foo"] 
[2011,12,5,15,21,"foo"] 
[2011,12,5,15,23,"foo"] 
[2011,12,5,16,2,"foo"] 
[2011,12,5,16,21,"foo"] 
[2011,12,5,16,23,"foo"] 
[2011,12,5,16,42,"bar"] 

然而，當我查詢這些使用的開始鍵：

[2011,12,5,14,16,"foo"] 

和結束鍵

[2011,12,5,16,60,"foo\ufff0"] 


http://couchdb_host:5984/the_db/_design/cf/_view/errors?startkey=[2011,12,5,14,16,%22foo%22]&endkey=[2011,12,5,16,60,%22foo\ufff0%22]&group_level=6 

我在結果中不斷得到「bar」的值：

{"rows":[ 
{"key":[2011,12,5,14,22,"foo"],"value":2}, 
{"key":[2011,12,5,14,23,"foo"],"value":1}, 
{"key":[2011,12,5,14,42,"bar"],"value":1}, 
{"key":[2011,12,5,15,2,"foo"],"value":1}, 
{"key":[2011,12,5,15,21,"foo"],"value":2}, 
{"key":[2011,12,5,15,23,"foo"],"value":1}, 
{"key":[2011,12,5,16,2,"foo"],"value":1}, 
{"key":[2011,12,5,16,21,"foo"],"value":2}, 
{"key":[2011,12,5,16,23,"foo"],"value":1}, 
{"key":[2011,12,5,16,42,"bar"],"value":1} 
]} 

我在哪裏掉下來？我期望「bar」被忽略，任何以「foo」開頭的東西都會被返回。這一切在紙上似乎都很簡單！

線索？

Answer 1

CouchDB正在返回所有按鍵，它們對startkey和小於（或等於）endkey排序較高（或相等）。 [2011,12,5,14,42，「bar」]的排序高於[2011,12,5,14,16，「foo」]，因爲42高於16，低於[2011,12,5， 16,60，「富\ ufff0」]，因爲42小於60

本頁面描述按鍵的排序方式：http://wiki.apache.org/couchdb/View_collation