HappenLee opened a new issue #4849:
URL: https://github.com/apache/incubator-doris/issues/4849
**Describe the bug**
DCHECK failed in group_concat
```
void AggregateFunctions::string_concat_update
const int header_len = sizeof(StringConcatHeader);
DCHECK(header_len == sizeof(sep->len));
```
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