confluentinc/ksql

avg should return null when no row is aggregated

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#9,752 创建于 2023年1月4日

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 (1 评论) (0 反应) (0 负责人)Java (5,739 star) (1,048 fork)batch import
enhancementgood first issue

描述

Is your feature request related to a problem? Please describe. avg returns 0.0 instead of NULL when no row is aggregated. However, IMHO, NULL is preferable because 0.0 means nothing. In addition, other projects like apache spark return null in this case. What do you think?

Describe the solution you'd like avg should return null when no row is aggregated.

Describe alternatives you've considered

Additional context

贡献者指南

技术栈
javasql
领域
database
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
needs maintainer response
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Java knowledgeSQL aggregate functionsksqlDB source code navigation
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
45
研究方向
Investigate the implementation of the AVG aggregate function in the ksqlDB codebase. Look for the method that computes the average and check how it handles zero rows. Consider modifying it to return null instead of 0.0 when no rows are aggregated. Review existing tests for AVG to understand expected behavior and add new tests for the null case.