[Bug](Highest) Be core happened while SELECT __DORIS_STREAM_CHANGE_TYPE_COL__

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no similar issues.

### Version

49af19213e7

### What's Wrong?

sql is `SELECT __DORIS_STREAM_CHANGE_TYPE_COL__, l_orderkey, l_quantity, l_comment FROM s_debug_update_type WHERE l_orderkey = 80001`

```
thrift error, reason=No more data to read.*** Query id: 4b19b44376794ab9-8b3f9f5ec27b1393 ***
*** tablet id: 0 ***
*** Aborted at 1783424797 (unix time) try "date -d @1783424797" if you are using GNU date ***
*** Current BE git commitID: 49af19213e7 ***
*** SIGSEGV invalid permissions for mapped object (@0x7feb93d15000) received by PID 21462 (TID 21938 OR 0x7fe9949d3640) from PID 184467440718945525
76; stack trace: ***
0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at ../src/common/signal_handler.h:417
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# 0x00007FEBFBABA520 in /lib/x86_64-linux-gnu/libc.so.6
4# memcpy at ./be/build_RELEASE/../src/glibc-compatibility/memcpy/memcpy_x86_64.cpp:219
5# doris::ColumnStr::insert_from(doris::IColumn const&, unsigned long) at ../src/core/column/column_string.h:187
6# doris::BlockReader::_min_delta_next_block(doris::Block*, bool*) in /mnt/hdd01/PERFORMANCE_ENV/be/lib/doris_be
7# doris::BlockReader::next_block_with_aggregation(doris::Block*, bool*) at ./be/build_RELEASE/../src/storage/iterator/block_reader.cpp:72
8# doris::OlapScanner::_get_block_impl(doris::RuntimeState*, doris::Block*, bool*) at ./be/build_RELEASE/../src/exec/scan/olap_scanner.cpp:817
9# doris::Scanner::get_block(doris::RuntimeState*, doris::Block*, bool*) in /mnt/hdd01/PERFORMANCE_ENV/be/lib/doris_be
10# doris::Scanner::get_block_after_projects(doris::RuntimeState*, doris::Block*, bool*) at ./be/build_RELEASE/../src/exec/scan/scanner.cpp:95
11# doris::ScannerScheduler::_scanner_scan(std::shared_ptr, std::shared_ptr) in /mnt/hdd01/PERFORMANCE_ENV/be/lib/doris_be
12# std::_Function_handler, std::shared_ptr)::$_0::operator()() const::{lambda()#1}>::_M_invoke(std::_Any_data const&) at /usr/local/ldb-toolchain-v0.26/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:292
13# doris::ScannerSplitRunner::process_for(std::chrono::duration >) at ./be/build_RELEASE/../src/exec/scan/scanner_scheduler.cpp:384
14# doris::PrioritizedSplitRunner::process() in /mnt/hdd01/PERFORMANCE_ENV/be/lib/doris_be
15# doris::TimeSharingTaskExecutor::_dispatch_thread() at ./be/build_RELEASE/../src/exec/scan/task_executor/time_sharing/time_sharing_task_executor.cpp:574
16# doris::Thread::supervise_thread(void*) at ./be/build_RELEASE/../src/util/thread.cpp:461
17# start_thread at ./nptl/pthread_create.c:442
18# 0x00007FEBFBB9E8D0 at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:83
```

### What You Expected?

SELECT Command will success

### How to Reproduce?

_No response_

### Anything Else?

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start by reproducing the reported SELECT on commit 49af19213e7, then inspect the crash path in src/core/column/column_string.h, src/storage/iterator/block_reader.cpp, and src/exec/scan/olap_scanner.cpp. Use the stack trace to narrow the invalid copy and verify that the query completes without a backend crash; the issue provides no reproduction setup or test location.

Written by the indexing model from the issue text.