| Ticket Hash: | 55746f9e65f8587c0ad0216e59645255454aad5e | |||
| Title: | group_concat() returns NULL instead of an empty string | |||
| Status: | Fixed | Type: | Code_Defect | |
| Severity: | Important | Priority: | Immediate | |
| Subsystem: | Unknown | Resolution: | Fixed | |
| Last Modified: | 2014-05-07 17:19:35 | |||
| Version Found In: | 3.8.4 | |||
| User Comments: | ||||
drh added on 2014-05-07 16:58:28:
(text/x-fossil-wiki)
The group_concat(x,'') aggregate function returns NULL when all inputs are empty strings. The correct return should be an empty string. <blockquote><verbatim> SELECT typeof(group_concat(x,'')) FROM (SELECT '' AS x UNION ALL SELECT ''); </verbatim></blockquote> This problem appears to have existed in the code since the group_concat() function was initially added to SQLite in version 3.5.4, 2007-12-14. | ||||