pingcap/tidb

Built-in function SOUNDEX not supported

Open

#3,930 创建于 2017年7月28日

在 GitHub 查看
 (4 评论) (0 反应) (0 负责人)Go (40,090 star) (6,186 fork)batch import
component/expressionhelp wantedtype/compatibility

描述

Please answer these questions before submitting your issue. Thanks!

  1. What did you do?
create table t1 (id integer, a varchar(100) character set utf8 collate utf8_unicode_ci); 
insert into t1 values (1, 'Test');    
select * from t1 where soundex(a) = soundex('Test');
  1. What did you expect to see?
+------+------+
| id   | a    |
+------+------+
|    1 | Test |
+------+------+
1 row in set (0.01 sec)
  1. What did you see instead?
ERROR 1105 (HY000): line 0 column 31 near "a) = soundex('Test')" (total length 51)
  1. What version of TiDB are you using (tidb-server -V)?

贡献者指南

技术栈
go
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。
stale
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
basic Go knowledgeunderstanding of TiDB expression layer
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
First, identify where built in functions are registered in TiDB. The expression package likely has a file like 'builtin string.go' where string functions are implemented. Look for existing similar functions (e.g., SOUNDEX is a string function). The implementation needs to compute the Soundex code (e.g., using a hash or algorithm as per MySQL standard). Also, add the function to the function registry and ensure it appears in MySQL compatibility tests. Check the issue comments for any additional context or prior attempts.