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MDEV-22236 JSON_ARRAYAGG query leads to SIGSEGV in Charset::swap on optimized builds.

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The json_arrayagg::val_str should handle NULL result.
This commit is contained in:
Alexey Botchkov
2020-04-28 16:08:18 +04:00
parent 0cd2b4c249
commit e545a60bf4
3 changed files with 24 additions and 7 deletions
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15
sql/item_jsonfunc.cc
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@@ -3632,13 +3632,14 @@ String* Item_func_json_arrayagg::convert_to_json(Item *item, String *res)
String* Item_func_json_arrayagg::val_str(String *str)
{
str= Item_func_group_concat::val_str(str);
String s;
s.append('[');
s.swap(*str);
str->append(s);
str->append(']');
if ((str= Item_func_group_concat::val_str(str)))
{
String s;
s.append('[');
s.swap(*str);
str->append(s);
str->append(']');
}
return str;
}