StarRocks/starrocks

trim function feature needs improvement

Open

#73,172 创建于 2026年5月12日

在 GitHub 查看
 (0 评论) (0 反应) (0 负责人)Java (5,717 star) (1,246 fork)batch import
good first issuetype/feature-requestversion:4.2

描述

--  the following 3 is  support:
mysql> SELECT TRIM('  bar   ');
        -> 'bar'
mysql> SELECT TRIM(BOTH 'x' FROM 'xxxbarxxx');
        -> 'bar'

-- the following is not support

mysql> SELECT TRIM(LEADING 'x' FROM 'xxxbarxxx');
        -> 'barxxx'
mysql> SELECT TRIM(TRAILING 'xyz' FROM 'barxxyz');
        -> 'barx'

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。
1-2 days
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。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
JavaSQL parsing
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。
40
研究方向
Examine the current trim function implementation in StarRocks, likely in the SQL parser and function evaluation code. Look for how similar functions like LTRIM/RTRIM are handled. The MySQL documentation specifies the syntax for LEADING, TRAILING, and BOTH with optional character removal. Focus on the parser to recognize these keywords and the execution engine to apply the specified removal. Check for any existing issues or PRs related to string functions for guidance.