luwei16 opened a new pull request, #42656:
URL: https://github.com/apache/doris/pull/42656
## problem
CREATE TABLE t (
`k1` VARCHAR(30) NOT NULL,
`v1` INT NOT NULL
)
alter table t modify column `v1` INT NULL
insert into value ('1', 2), ('1', 3);
core dump
## reason
Schema change leads to double writing, during double writing, the two
schemas and slots are as follows
```
old tablet schema
k1 varchar not null
v1 int not null
```
```
new tablet scheam
k1 varchar not null
v1 int null
```
```
slot
k1 varchar not null
v1 int not null
v1 int null
```
During the double writing process, when selecting slots through the schema,
only the column names and types were compared, without comparing the nullable
attributes, which led to the selection of the wrong slot. Since the slot
determines the nullable attribute of the block, the nullable attribute of the
columns in the block is different from that of the columns in the schema,
resulting in a core dump.
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