mymeiyi opened a new pull request, #67633:
URL: https://github.com/apache/doris/pull/67633
Problem Summary: An expression-only load can legitimately omit the optional
destination-to-source direct slot map. FileScanner previously skipped
initializing its destination-ordered source descriptor vector in that case.
When an expression produced NULL under strict mode, output conversion indexed
the empty vector and could abort the BE.
```
*** SIGABRT unknown detail explain (@0x3f500000373) received by PID 883 (TID
2653 OR 0x7bd43699f700) from PID 883; stack trace: ***
0# doris::signal::(anonymous namespace)::FailureSignalHandler(int,
siginfo_t*, void*) at ../src/common/signal_handler.h:418
1# 0x00007FE3F5E55140 in /lib/x86_64-linux-gnu/libpthread.so.0
2# raise in /lib/x86_64-linux-gnu/libc.so.6
3# abort in /lib/x86_64-linux-gnu/libc.so.6
4# 0x000055E3C2D186A7 in /opt/apache-doris/be/lib/doris_be
5# std::vector<doris::SlotDescriptor*,
std::allocator<doris::SlotDescriptor*> >::operator[](unsigned long) at
/mnt/disk2/meiyi/soft/ldb_toolchain/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/stl_vector.h:1263
6# doris::FileScanner::_convert_to_output_block(doris::Block*) at
./be/src/exec/scan/file_scanner.cpp:810
7#
doris::FileScanner::_process_src_block_after_read_for_load(doris::Block*) at
./be/src/exec/scan/file_scanner.cpp:902
8# doris::FileScanner::_process_src_block_after_read(doris::Block*) at
./be/src/exec/scan/file_scanner.cpp:868
9# doris::FileScanner::_get_block_wrapped(doris::RuntimeState*,
doris::Block*, bool*) at ./be/src/exec/scan/file_scanner.cpp:595
10# doris::FileScanner::_get_block_impl(doris::RuntimeState*, doris::Block*,
bool*) at ./be/src/exec/scan/file_scanner.cpp:514
11# doris::Scanner::get_block(doris::RuntimeState*, doris::Block*, bool*) at
./be/src/exec/scan/scanner.cpp:171
12# doris::Scanner::get_block_after_projects(doris::RuntimeState*,
doris::Block*, bool*) at ./be/src/exec/scan/scanner.cpp:138
13#
doris::ScannerScheduler::_scanner_scan(std::shared_ptr<doris::ScannerContext>,
std::shared_ptr<doris::ScanTask>) at
./be/src/exec/scan/scanner_scheduler.cpp:193
```
Initialize one source descriptor entry for every destination expression,
using nullptr when no direct mapping exists. This preserves destination index
alignment and the existing strict-mode and NOT NULL filtering semantics.
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