Add Support for Hash Field Expiration Commands (HEXPIRE, HEXPIREAT, HGETEX, HPERSIST)

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Add Support for Hash Field Expiration Commands (HEXPIRE, HEXPIREAT, HGETEX, HPERSIST)

Introduction

Valkey 9.0 has introduced new commands for setting expiration times on individual hash fields: HEXPIRE, HEXPIREAT, HGETEX, and HPERSIST. These commands allow developers to set expiration times for individual fields independently, enabling finer-grained and more flexible cache control. This enhancement is particularly beneficial for user sessions, temporary data, or cache segmentation scenarios.

According to the Valkey 9.0 release announcement (https://www.linuxmi.com/valkey-9-0.html), these new commands break previous limitations and provide more granular control over hash field expiration.

Proposal

I propose that Kvrocks should also implement these new commands to enhance its compatibility with Redis/Valkey and provide users with more advanced caching capabilities:

1. HEXPIRE - Set expiration time for a hash field with a TTL in seconds
   https://redis.io/docs/latest/commands/hexpire/

2. HEXPIREAT - Set expiration time for a hash field with an absolute Unix timestamp
   https://redis.io/docs/latest/commands/hexpireat/

3. HGETEX - Get the value of a hash field and set its expiration time
   https://redis.io/docs/latest/commands/hexpireat/

4. HPERSIST - Remove expiration time from a hash field## About Valkey
   https://redis.io/docs/latest/commands/hpersist/

Valkey is a drop-in replacement for Redis that maintains full compatibility while being developed under a truly open-source license (BSD). Major cloud providers including Alibaba, Huawei, Tencent, Amazon, Google, and Ericsson have joined the Valkey initiative.

As noted in industry reports (https://mp.weixin.qq.com/s/6JY3Sl2pLBCLT6Ry1lPdHA), Valkey currently has 6 core maintainers from leading technology companies, ensuring robust community support and ongoing development.

Furthermore, Arch Linux has officially deprecated Redis in favor of Valkey (https://mp.weixin.qq.com/s/yOBjPk1Gqsp2ljQB-3T0nA), highlighting the growing adoption of Valkey as the preferred Redis alternative.

The primary reason for this shift is that Redis changed its license from BSD-3-Clause to RSALv2 and SSPLv1 on March 20, 2024, which many consider to no longer qualify as open-source software. Valkey, as a fork of Redis under the BSD license, represents a community-driven alternative promoted by major companies including Amazon, Google, and Oracle.

Implementing these new hash expiration commands would position Kvrocks as a more complete Redis/Valkey-compatible solution, aligning with the direction of the broader open-source community.

添加对哈希字段过期命令的支持 (HEXPIRE、HEXPIREAT、HGETEX、HPERSIST)

简介

Valkey 9.0 引入了新的命令来为单个哈希字段设置过期时间：HEXPIRE、HEXPIREAT、HGETEX 和 HPERSIST。这些命令允许开发人员独立地为各个字段设置过期时间，从而实现更精细和灵活的缓存控制。对于用户会话、临时数据或缓存细分等场景来说，这一增强功能尤其有益。

根据 Valkey 9.0 发布公告 (https://www.linuxmi.com/valkey-9-0.html)，这些新命令打破了之前的限制，提供了对哈希字段过期更精细的控制。

建议

建议 Kvrocks 也实现这些新命令，以增强其与 Redis/Valkey 的兼容性，并为用户提供更高级的缓存功能：

1. HEXPIRE - 使用以秒为单位的 TTL 为哈希字段设置过期时间
2. HEXPIREAT - 使用绝对 Unix 时间戳为哈希字段设置过期时间
3. HGETEX - 获取哈希字段的值并设置其过期时间
4. HPERSIST - 移除哈希字段的过期时间

关于 Valkey

Valkey 是 Redis 的直接替代品，在保持完全兼容的同时采用真正的开源许可(BSD)进行开发。包括阿里、华为、腾讯、亚马逊、谷歌和爱立信在内的主要云提供商已加入 Valkey 倡议。

正如行业报告中所述 (https://mp.weixin.qq.com/s/6JY3Sl2pLBCLT6Ry1lPdHA)，Valkey 目前有 6 位来自领先技术公司的核心维护者，确保了强大的社区支持和持续的开发。

此外，Arch Linux 已正式弃用 Redis 转而支持 Valkey (https://mp.weixin.qq.com/s/yOBjPk1Gqsp2ljQB-3T0nA)，这突显了 Valkey 作为首选 Redis 替代品日益增长的采用率。

这种转变的主要原因是 Redis 在 2024 年 3 月 20 日将其许可证从 BSD-3-Clause 更改为 RSALv2 和 SSPLv1，许多人认为这不再符合开源软件的资格。Valkey 作为 BSD 许可证下的 Redis 分支，代表了由亚马逊、谷歌和甲骨文等大公司推动的社区驱动替代方案。

实现这些新的哈希过期命令将使 Kvrocks 成为更完整的 Redis/Valkey 兼容解决方案，与更广泛的开源社区发展方向保持一致。