jihuayu opened a new pull request, #1479:
URL: https://github.com/apache/incubator-kvrocks/pull/1479

   I have followed the rules below and completed all the modifications.
   
   
https://github.com/apache/incubator-kvrocks/issues/1451#issuecomment-1565481854
   
   > ### The files match `types/redis_*.h`
   > 
   > - For the function similar to 
[`Set#IsMember`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_set.h#L36)
 or 
[`String#SetNX`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_string.h#L47)
 that `ret` means the flag, I will change it to `bool *flag`
   > 
   > - For the function similar to 
[`Set#Remove`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_set.h#L39)
 that `ret` means the number of removed elements, I will change it to `uint64_t 
*removed_cnt`
   > 
   > - For the function similar to 
[`List#Size`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_list.h#L36)
 that `ret` means the size of list, I will change it to `uint64_t *size`
   > 
   > - For the function similar to 
[`List#Size`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_list.h#L36)
 that `ret` means the size of list, I will change it to `uint64_t *size`
   > 
   > - For the function similar to 
[`String#IncrBy`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/types/redis_string.h#L50)
 that `ret` means the new value, I will change it to `int64_t *new_value`
   > 
   > - In cases where `ret` may be negative, I will set the type to `int*`.
   > 
   > ### The files match `commands/cmd_*.cc`
   > 
   > I will change the type of `int ret` to the correct type, but I will **not 
change the variable name** because it represents the return value of the Redis 
command.
   > 
   > ### The test files
   > 
   > I will change the type of `int ret` to the correct type, and I will decide 
whether to modify the variable name based on the situation.
   > 
   > 
   > ### All files
   > 
   > I will remove all unnecessary `static_cast` statements.
   > 
   > **I will use 
`uint64_t`([`Metadata#size`](https://github.com/apache/incubator-kvrocks/blob/unstable/src/storage/redis_metadata.h#L121)
 type) as the type for length everywhere, instead of the `size_t`.**
   > 
   


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