lihangyu
9aaa6ba351
[Fix](Variant) fix variant lost null info after cast_column (#30153)
This could result incorrect output in hirachinal cases
```
sql """insert into ${table_name} values (-3, '{"a" : 1, "b" : 1.5, "c" : [1, 2, 3]}')"""
sql """insert into ${table_name} select -2, '{"a": 11245, "b" : [123, {"xx" : 1}], "c" : {"c" : 456, "d" : "null", "e" : 7.111}}' as json_str
union all select -1, '{"a": 1123}' as json_str union all select *, '{"a" : 1234, "xxxx" : "kaana"}' as json_str from numbers("number" = "4096") limit 4096 ;"""
mysql> select v["c"] from var_rs where k = -3 or k = -2;
+----------------------+
| element_at(`v`, 'c') |
+----------------------+
| [1,2,3] |
| [] |
+----------------------+
2 rows in set (0.04 sec)
```
2024-01-27 09:08:29 +08:00
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