pingcap/tidb

Built-in function SOUNDEX not supported

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#3,930 opened on Jul 28, 2017

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component/expressionhelp wantedtype/compatibility

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Description

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)?

Contributor guide

Research direction
Implement the SOUNDEX function in TiDB's expression framework. Inspect existing string functions for patterns, add the function to the builtin list, and register it in the expression evaluation logic.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoSQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65