kaka11chen opened a new pull request, #40857:
URL: https://github.com/apache/doris/pull/40857
## Proposed changes
### Issue
```
/var/local/ldb-toolchain/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_vector.h:1046:9:
runtime error: reference binding to null pointer of type 'doris::StringRef'
#0 0x55ee63eb0418 in std::vector<doris::StringRef,
std::allocator<doris::StringRef>>::operator[](unsigned long)
/var/local/ldb-toolchain/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_vector.h:1046:2
#1 0x55ee63eb0418 in doris::Status
doris::vectorized::OrcReader::_decode_string_non_dict_encoded_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::mutable_ptr<doris::vectorized::IColumn>
const&, orc::TypeKind const&, orc::EncodedStringVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1172:39
#2 0x55ee63ea2685 in doris::Status
doris::vectorized::OrcReader::_decode_string_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::mutable_ptr<doris::vectorized::IColumn>
const&, orc::TypeKind const&, orc::ColumnVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1124:16
#3 0x55ee63e97e7a in doris::Status
doris::vectorized::OrcReader::_fill_doris_data_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::mutable_ptr<doris::vectorized::IColumn>&,
std::shared_ptr<doris::vectorized::IDataType const> const&, orc::Type const*,
orc::ColumnVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1365:16
#4 0x55ee63b0e450 in doris::Status
doris::vectorized::OrcReader::_orc_column_to_doris_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::immutable_ptr<doris::vectorized::IColumn>&,
std::shared_ptr<doris::vectorized::IDataType const> const&, orc::Type const*,
orc::ColumnVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1532:5
#5 0x55ee63e99622 in doris::Status
doris::vectorized::OrcReader::_fill_doris_data_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::mutable_ptr<doris::vectorized::IColumn>&,
std::shared_ptr<doris::vectorized::IDataType const> const&, orc::Type const*,
orc::ColumnVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1410:9
#6 0x55ee63b0e450 in doris::Status
doris::vectorized::OrcReader::_orc_column_to_doris_column<false>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char>> const&,
COW<doris::vectorized::IColumn>::immutable_ptr<doris::vectorized::IColumn>&,
std::shared_ptr<doris::vectorized::IDataType const> const&, orc::Type const*,
orc::ColumnVectorBatch*, unsigned long)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1532:5
#7 0x55ee63ad4f86 in
doris::vectorized::OrcReader::get_next_block_impl(doris::vectorized::Block*,
unsigned long*, bool*)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1714:13
#8 0x55ee63ad093b in
doris::vectorized::OrcReader::get_next_block(doris::vectorized::Block*,
unsigned long*, bool*)
/home/zcp/repo_center/doris_master/doris/be/src/vec/exec/format/orc/vorc_reader.cpp:1547:5
```
### Solution
[Fix] (orc-reader) Fix StringRef nullptr data in orc-reader. When string is
empty in orc row batch, the data can point anything, maybe nullptr, StringRef
has undefined behavior when data is nullptr.
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