branch-4.0: [fix](schema-change) Prevent coredump when reading non-overlapping segments from a single rowset during heavy schema change #57191 #57602
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…gments from a single rowset during heavy schema change (#57191) ### What problem does this PR solve? Problem Summary: ``` *** Query id: 0-0 *** *** is nereids: 0 *** *** tablet id: 1751140494462 *** *** Aborted at 1751208065 (unix time) try "date -d @1751208065" if you are using GNU date *** *** Current BE git commitID: 34d8342 *** *** SIGSEGV invalid permissions for mapped object (@0x556ef4dfc000) received by PID 4975 (TID 5587 OR 0x7f71da3c4640) from PID 18446744073522888704; stack trace: *** 0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/common/signal_handler.h:421 1# PosixSignals::chained_handler(int, siginfo*, void*) [clone .part.0] in /usr/lib/jvm/java-17-openjdk-amd64/lib/server/libjvm.so 2# JVM_handle_linux_signal in /usr/lib/jvm/java-17-openjdk-amd64/lib/server/libjvm.so 3# 0x00007F731FC1F520 in /lib/x86_64-linux-gnu/libc.so.6 4# doris::vectorized::VMergeIteratorContext::copy_rows(doris::vectorized::Block*, bool) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/vec/olap/vgeneric_iterators.cpp:148 5# doris::Status doris::vectorized::VMergeIterator::_next_batch<doris::vectorized::Block>(doris::vectorized::Block*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/vec/olap/vgeneric_iterators.h:242 6# doris::vectorized::VMergeIterator::next_batch(doris::vectorized::Block*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/vec/olap/vgeneric_iterators.h:201 7# doris::BetaRowsetReader::next_block(doris::vectorized::Block*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/olap/rowset/beta_rowset_reader.cpp:378 8# doris::VSchemaChangeDirectly::_inner_process(std::shared_ptr<doris::RowsetReader>, doris::RowsetWriter*, std::shared_ptr<doris::BaseTablet>, std::shared_ptr<doris::TabletSchema>, std::shared_ptr<doris::TabletSchema>) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/olap/schema_change.cpp:523 9# doris::SchemaChange::process(std::shared_ptr<doris::RowsetReader>, doris::RowsetWriter*, std::shared_ptr<doris::BaseTablet>, std::shared_ptr<doris::BaseTablet>, std::shared_ptr<doris::TabletSchema>, std::shared_ptr<doris::TabletSchema>) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/olap/schema_change.h:120 10# doris::SchemaChangeJob::_convert_historical_rowsets(doris::SchemaChangeParams const&, long*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/olap/schema_change.cpp:1179 11# doris::SchemaChangeJob::_do_process_alter_tablet(doris::TAlterTabletReqV2 const&) in /mnt/hdd01/PERFORMANCE_ENV/be/lib/doris_be 12# doris::SchemaChangeJob::process_alter_tablet(doris::TAlterTabletReqV2 const&) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/olap/schema_change.cpp:759 13# doris::alter_tablet_callback(doris::StorageEngine&, doris::TAgentTaskRequest const&) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/agent/task_worker_pool.cpp:1990 14# std::_Function_handler<void (), doris::TaskWorkerPool::submit_task(doris::TAgentTaskRequest const&)::$_0::operator()<doris::TAgentTaskRequest const&>(doris::TAgentTaskRequest const&) const::{lambda()#1}>::_M_invoke(std::_Any_data const&) at /var/local/ldb-toolchain/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/std_function.h:291 15# doris::ThreadPool::dispatch_thread() at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/util/threadpool.cpp:609 16# doris::Thread::supervise_thread(void*) at /home/zcp/repo_center/doris_branch-3.0/doris/be/src/util/thread.cpp:499 17# start_thread at ./nptl/pthread_create.c:442 18# 0x00007F731FD03850 at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:83 ``` Schema of input block from base tablet should merge dropped column.
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Cherry-picked from #57191