eldenmoon opened a new pull request, #31572:
URL: https://github.com/apache/doris/pull/31572
…torVariant::set_source_column`
When compaction, if some segments miss variant root, there is chance to get
emtpy root variant.So add some defence code in OlapColumnDataConvertorVariant
to prevent from accessing null root
```
5# doris::vectorized::ColumnObject::Subcolumn::get_finalized_column_ptr()
const at
/mnt/ssd01/selectdb-doris-package/enterprise-core/be/src/vec/columns/column_object.cpp:556
6#
doris::vectorized::OlapBlockDataConvertor::OlapColumnDataConvertorVariant::set_source_column(doris::vectorized::ColumnWithTypeAndName
const&, unsigned long, unsigned long) at
/mnt/ssd01/selectdb-doris-package/enterprise-core/be/src
/vec/olap/olap_data_convertor.cpp:1076
7#
doris::vectorized::OlapBlockDataConvertor::set_source_content(doris::vectorized::Block
const*, unsigned long, unsigned long) at
/mnt/ssd01/selectdb-doris-package/enterprise-core/be/src/vec/olap/olap_data_convertor.cpp:207
8# doris::segment_v2::SegmentWriter::append_block(doris::vectorized::Block
const*, unsigned long, unsigned long) at
/mnt/ssd01/selectdb-doris-package/enterprise-core/be/src/olap/rowset/segment_v2/segment_writer.cpp:727
9# doris::VerticalBetaRowsetWriter::add_columns(doris::vectorized::Block
const*, std::vector > const&, bool, unsigned int) at
/mnt/ssd01/selectdb-doris-package/enterprise-core/be/src/olap/row
set/vertical_beta_rowset_writer.cpp:125
```
## Proposed changes
Issue Number: close #xxx
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