fix:zverank return error

Walkthrough

This update includes modifications to the Redis::ZRevrank method in redis_zsets.cc, specifically altering the loop condition logic. Additionally, a new test case is introduced in zset_test.go to cover a variety of ZSET-related operations in Redis, providing more comprehensive test coverage for commands like ZREVRANK, ZRank, ZRevRank, ZScan, ZCard, and ZAdd.

Changes

Files	Change Summary
`src/storage/src/redis_zsets.cc`	Modified the loop condition in `Redis::ZRevrank` method from `left >= 0` to `left > 0`, affecting the iteration logic and termination.
`tests/integration/zset_test.go`	Introduced a new test case covering ZSET operations including ZREVRANK, ZRank, ZRevRank, ZScan, ZCard, and ZAdd.

Sequence Diagram(s)

sequenceDiagram
    participant Client as Client
    participant Redis as Redis Server
    participant Zsets as ZSets Module

    Client->>Redis: Send ZREVRANK Command
    Redis->>Zsets: Call ZRevrank Method
    Zsets->>Redis: Return Rank (new loop condition applied)
    Redis->>Client: Respond with Rank

    Client->>Redis: Send ZADD Command
    Redis->>Zsets: Update ZSets
    Zsets->>Redis: Acknowledge Update
    Redis->>Client: Respond with Status

    Client->>Redis: Send ZSCAN Command
    Redis->>Zsets: Call ZScan Method
    Zsets->>Redis: Return Scan Results
    Redis->>Client: Respond with Scan Results

Poem

In the land of code where logic bends,
Redis found a loop that ends.
With left > 0 it now will flow,
A smarter way for ranks to show.
Tests arise like dawn's first light,
Ensuring ZSETs will work just right.
Hats off to code, where changes gleam,
In every byte, a coder's dream. 🌟

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OpenAtomFoundation / pika