acelyc111 opened a new issue #4660:
URL: https://github.com/apache/incubator-doris/issues/4660
**Describe the bug**
BE coredump when do schema change on a column from CHAR(10) to VARCHAR(64)
```
Core was generated by
`/home/work/app/doris/zjyprc-hadoop/be/package/be/lib/palo_be'.
Program terminated with signal 11, Segmentation fault.
#0 is_null (this=0x52a4c280) at
/home/laiyingchun/ap_doris/be/src/olap/wrapper_field.h:84
84 /home/laiyingchun/ap_doris/be/src/olap/wrapper_field.h: 没有那个文件或目录.
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-157.el7_3.1.x86_64 libgcc-4.8.5-28.el7_5.1.x86_64
zlib-1.2.7-17.el7.x86_64
(gdb)
(gdb)
(gdb) bt
#0 is_null (this=0x52a4c280) at
/home/laiyingchun/ap_doris/be/src/olap/wrapper_field.h:84
#1 compare_cell<doris::WrapperField, doris::RowCursorCell> (this=<optimized
out>, rhs=<synthetic pointer>, lhs=...) at
/home/laiyingchun/ap_doris/be/src/olap/field.h:137
#2 doris::ColumnDataWriter::next<doris::RowCursor>
(this=this@entry=0x8c0ad20, row=...) at
/home/laiyingchun/ap_doris/be/src/olap/rowset/column_data_writer.cpp:147
#3 0x0000000000f285e1 in doris::ColumnDataWriter::write<doris::RowCursor>
(this=0x8c0ad20, row=...) at
/home/laiyingchun/ap_doris/be/src/olap/rowset/column_data_writer.cpp:130
#4 0x0000000000f1894b in
doris::AlphaRowsetWriter::_add_row<doris::RowCursor> (this=0x35c87540, row=...)
at /home/laiyingchun/ap_doris/be/src/olap/rowset/alpha_rowset_writer.cpp:83
#5 0x0000000001583cc0 in _write_row_block (row_block=0x8c0b900,
rowset_writer=0x35c87540, this=0x3af04060) at
/home/laiyingchun/ap_doris/be/src/olap/schema_change.cpp:745
#6 doris::SchemaChangeDirectly::process (this=0x3af04060,
rowset_reader=..., rowset_writer=0x35c87540, new_tablet=..., base_tablet=...)
at /home/laiyingchun/ap_doris/be/src/olap/schema_change.cpp:845
#7 0x000000000158af86 in
doris::SchemaChangeHandler::_convert_historical_rowsets (sc_params=...) at
/home/laiyingchun/ap_doris/be/src/olap/schema_change.cpp:1718
#8 0x000000000158d59d in
doris::SchemaChangeHandler::_do_process_alter_tablet_v2
(this=this@entry=0x7fdf53af7cf0, request=...) at
/home/laiyingchun/ap_doris/be/src/olap/schema_change.cpp:1388
#9 0x000000000158e5a2 in
doris::SchemaChangeHandler::process_alter_tablet_v2
(this=this@entry=0x7fdf53af7cf0, request=...) at
/home/laiyingchun/ap_doris/be/src/olap/schema_change.cpp:1217
#10 0x00000000015c0abf in doris::EngineAlterTabletTask::execute
(this=0x7fdf53af7f40) at
/home/laiyingchun/ap_doris/be/src/olap/task/engine_alter_tablet_task.cpp:39
#11 0x0000000000df284e in doris::StorageEngine::execute_task
(this=0x5c6cc80, task=task@entry=0x7fdf53af7f40) at
/home/laiyingchun/ap_doris/be/src/olap/storage_engine.cpp:932
#12 0x00000000013ea8d1 in doris::TaskWorkerPool::_alter_tablet
(this=this@entry=0x6d79e60, worker_pool_this=worker_pool_this@entry=0x6d79e60,
agent_task_req=..., signature=signature@entry=16036347,
task_type=task_type@entry=doris::TTaskType::ALTER,
finish_task_request=finish_task_request@entry=0x7fdf53af8010) at
/home/laiyingchun/ap_doris/be/src/agent/task_worker_pool.cpp:514
#13 0x00000000013f3e27 in
doris::TaskWorkerPool::_alter_tablet_worker_thread_callback
(arg_this=0x6d79e60) at
/home/laiyingchun/ap_doris/be/src/agent/task_worker_pool.cpp:466
#14 0x00007fdfd67eedc5 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fdfd6afa73d in clone () from /lib64/libc.so.6
(gdb) f 1
#1 compare_cell<doris::WrapperField, doris::RowCursorCell> (this=<optimized
out>, rhs=<synthetic pointer>, lhs=...) at
/home/laiyingchun/ap_doris/be/src/olap/field.h:137
137 /home/laiyingchun/ap_doris/be/src/olap/field.h: 没有那个文件或目录.
(gdb) p lhs
$4 = (const doris::WrapperField &) @0x52a4c280: {
_vptr.WrapperField = 0x600000000537970,
_rep = 0x0,
_is_string_type = false,
_field_buf = 0x0, // I‘m confused how these fields are
0x0.
_owned_buf = 0x0,
_length = 281474976710656,
_var_length = 0,
_string_content = {
_M_t = {
_M_t = {
<std::_Tuple_impl<0, char*, std::default_delete<char []> >> = {
<std::_Tuple_impl<1, std::default_delete<char []> >> = {
<std::_Head_base<1, std::default_delete<char []>, true>> = {
<std::default_delete<char []>> = {<No data fields>}, <No data
fields>}, <No data fields>},
<std::_Head_base<0, char*, false>> = {
_M_head_impl = 0x0
}, <No data fields>}, <No data fields>}
}
}
}
```
I‘m confused ho fields like _field_buf, _rep are 0x0.
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