[fix](function) A crash caused by nullptr in json_exists_path

[mrhhsg]

What problem does this PR solve?

*** SIGSEGV address not mapped to object (@0x0) received by PID 2836285 (TID 2842945 OR 0x7bcf0eee9700) from PID 0; stack trace: ***
 0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at /root/doris/be/src/common/signal_handler.h:420
 1# 0x00007FD73A577D10 in /lib64/libpthread.so.0
 2# doris::vectorized::PODArray<unsigned char, 4096ul, doris::Allocator<false, false, false, doris::DefaultMemoryAllocator, false>, 16ul, 15ul>::t_start() const at /root/doris/be/src/vec/common/pod_array.h:414
 3# doris::vectorized::PODArray<unsigned char, 4096ul, doris::Allocator<false, false, false, doris::DefaultMemoryAllocator, false>, 16ul, 15ul>::data() const at /root/doris/be/src/vec/common/pod_array.h:454
 4# doris::vectorized::FunctionJsonbExtractPath::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long) const at /root/doris/be/src/vec/functions/function_jsonb.cpp:730
 5# non-virtual thunk to doris::vectorized::FunctionJsonbExtractPath::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long) const in /root/doris/be/output/lib/doris_be
 6# doris::vectorized::PreparedFunctionImpl::_execute_skipped_constant_deal(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long, bool) const at /root/doris/be/src/vec/functions/function.cpp:120
 7# doris::vectorized::PreparedFunctionImpl::execute_without_low_cardinality_columns(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long, bool) const at /root/doris/be/src/vec/functions/function.cpp:242
 8# doris::vectorized::PreparedFunctionImpl::execute(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long, bool) const at /root/doris/be/src/vec/functions/function.cpp:248
 9# doris::vectorized::IFunctionBase::execute(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned int, unsigned long, bool) const at /root/doris/be/src/vec/functions/function.h:189
10# doris::vectorized::VectorizedFnCall::_do_execute(doris::vectorized::VExprContext*, doris::vectorized::Block*, int*, std::vector<unsigned int, std::allocator<unsigned int> >&) at /root/doris/be/src/vec/exprs/vectorized_fn_call.cpp:238
11# doris::vectorized::VectorizedFnCall::execute(doris::vectorized::VExprContext*, doris::vectorized::Block*, int*) at /root/doris/be/src/vec/exprs/vectorized_fn_call.cpp:272
12# doris::vectorized::VExprContext::execute(doris::vectorized::Block*, int*) at /root/doris/be/src/vec/exprs/vexpr_context.cpp:61
13# doris::vectorized::Scanner::_do_projections(doris::vectorized::Block*, doris::vectorized::Block*) at /root/doris/be/src/vec/exec/scan/scanner.cpp:191
14# doris::vectorized::Scanner::get_block_after_projects(doris::RuntimeState*, doris::vectorized::Block*, bool*) at /root/doris/be/src/vec/exec/scan/scanner.cpp:83
15# doris::vectorized::ScannerScheduler::_scanner_scan(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>) at /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:182
16# doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}::operator()() const::{lambda()#1}::operator()() const at /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:96
17# doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}::operator()() const at /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:95
18# bool std::__invoke_impl<bool, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}&>(std::__invoke_other, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:63
19# std::enable_if<is_invocable_r_v<bool, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}&>, bool>::type std::__invoke_r<bool, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}&>(doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:116
20# std::_Function_handler<bool (), doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_0::operator()() const::{lambda()#1}>::_M_invoke(std::_Any_data const&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:292
21# std::function<bool ()>::operator()() const at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:593
22# doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}::operator()() const at /root/doris/be/src/vec/exec/scan/scanner_scheduler.h:193
23# void std::__invoke_impl<void, doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}&>(std::__invoke_other, doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:63
24# std::enable_if<is_invocable_r_v<void, doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}&>, void>::type std::__invoke_r<void, doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}&>(doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:119
25# std::_Function_handler<void (), doris::vectorized::ThreadPoolSimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::{lambda()#1}>::_M_invoke(std::_Any_data const&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:292
26# std::function<void ()>::operator()() const at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:593
27# doris::FunctionRunnable::run() at /root/doris/be/src/util/threadpool.cpp:60
28# doris::ThreadPool::dispatch_thread() at /root/doris/be/src/util/threadpool.cpp:614
29# void std::__invoke_impl<void, void (doris::ThreadPool::*&)(), doris::ThreadPool*&>(std::__invoke_memfun_deref, void (doris::ThreadPool::*&)(), doris::ThreadPool*&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:76
30# std::__invoke_result<void (doris::ThreadPool::*&)(), doris::ThreadPool*&>::type std::__invoke<void (doris::ThreadPool::*&)(), doris::ThreadPool*&>(void (doris::ThreadPool::*&)(), doris::ThreadPool*&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:98
31# void std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/functional:515
32# void std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>::operator()<, void>() at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/functional:600
33# void std::__invoke_impl<void, std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>&>(std::__invoke_other, std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:63
34# std::enable_if<is_invocable_r_v<void, std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>&>, void>::type std::__invoke_r<void, std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>&>(std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()>&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/invoke.h:119
35# std::_Function_handler<void (), std::_Bind<void (doris::ThreadPool::*(doris::ThreadPool*))()> >::_M_invoke(std::_Any_data const&) at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:292
36# std::function<void ()>::operator()() const at /root/ldb_toolchain_taipan/bin/../lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/std_function.h:593
37# doris::Thread::supervise_thread(void*) at /root/doris/be/src/util/thread.cpp:460
38# asan_thread_start(void*) in /root/doris/be/output/lib/doris_be
39# start_thread in /lib64/libpthread.so.0
40# __GI___clone in /lib64/libc.so.6

Related PR: #xxx

Problem Summary:

Release note

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Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[Thearas]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[mrhhsg]

run buildall

[zclllyybb]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[doris-robot]

BE UT Coverage Report

Increment line coverage 0.00% (0/1) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	52.40% (17626/33636)
Line Coverage	37.62% (160029/425327)
Region Coverage	32.13% (121820/379131)
Branch Coverage	33.49% (53418/159506)

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 100.00% (1/1) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	71.17% (23398/32875)
Line Coverage	57.55% (244248/424435)
Region Coverage	52.94% (203460/384305)
Branch Coverage	54.54% (87402/160243)