### What problem does this PR solve?

```
/root/doris/be/src/vec/common/pod_array.h:510:29: runtime error: null pointer passed as argument 2, which is declared to never be null
/root/ldb_toolchain/bin/../usr/include/string.h:43:28: note: nonnull attribute specified here
    #0 0x55cb2c2cea1e in void doris::vectorized::PODArray<unsigned char, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>::insert_assume_reserved<char const*, char const*>(char const*, char const*) /root/doris/be/src/vec/common/pod_array.h:510:9
    #1 0x55cb2c2ce8a7 in void doris::vectorized::PODArray<unsigned char, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>::insert<char const*, char const*>(char const*, char const*) /root/doris/be/src/vec/common/pod_array.h:472:9
    #2 0x55cb5a0b0d50 in doris::vectorized::StringOP::push_value_string(std::basic_string_view<char, std::char_traits<char>> const&, unsigned long, doris::vectorized::PODArray<unsigned char, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>&, doris::vectorized::PODArray<unsigned int, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>&) /root/doris/be/src/vec/functions/function_string.h:128:15
    #3 0x55cb5d6843a2 in doris::Status doris::vectorized::FunctionStringParseUrl::vector_parse<false, true>(doris::vectorized::ColumnStr<unsigned int> const*, std::vector<doris::UrlParser::UrlPart, std::allocator<doris::UrlParser::UrlPart>>&, int, doris::vectorized::PODArray<unsigned char, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>&, doris::vectorized::PODArray<unsigned char, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>&, doris::vectorized::PODArray<unsigned int, 4096ul, Allocator<false, false, false, DefaultMemoryAllocator>, 16ul, 15ul>&) /root/doris/be/src/vec/functions/function_string.h:2806:17
    #4 0x55cb5d683e9d in auto doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto)::operator()<std::integral_constant<bool, false>, std::integral_constant<bool, true>>(auto, auto) const /root/doris/be/src/vec/functions/function_string.h:2783:13
    #5 0x55cb5d683c39 in auto std::__invoke_impl<doris::Status, doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto), std::integral_constant<bool, false>, std::integral_constant<bool, true>>(std::__invoke_other, auto&&, std::integral_constant<bool, false>&&, std::integral_constant<bool, true>&&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61:14
    #6 0x55cb5d683af5 in std::__invoke_result<auto, std::integral_constant<bool, false>, std::integral_constant<bool, true>>::type std::__invoke<doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto), std::integral_constant<bool, false>, std::integral_constant<bool, true>>(auto&&, std::integral_constant<bool, false>&&, std::integral_constant<bool, true>&&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:96:14
    #7 0x55cb5d682dd3 in std::__detail::__variant::__gen_vtable_impl<std::__detail::__variant::_Multi_array<std::__detail::__variant::__deduce_visit_result<doris::Status> (*)(doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto)&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&)>, std::integer_sequence<unsigned long, 0ul, 1ul>>::__visit_invoke(doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto)&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/variant:1032:11
    #8 0x55cb5d682ad5 in decltype(auto) std::__do_visit<std::__detail::__variant::__deduce_visit_result<doris::Status>, doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto), std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>(auto&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/variant:1758:15
    #9 0x55cb5d67766b in std::invoke_result<auto, std::__conditional<is_lvalue_reference_v<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>>::type<std::variant_alternative<0ul, std::remove_reference<decltype(__variant::__as(std::declval<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>()))>::type>::type&, std::variant_alternative<0ul, std::remove_reference<decltype(__variant::__as(std::declval<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>()))>::type>::type&&>, std::__conditional<is_lvalue_reference_v<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>>::type<std::variant_alternative<0ul, std::remove_reference<decltype(__variant::__as(std::declval<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>()))>::type>::type&, std::variant_alternative<0ul, std::remove_reference<decltype(__variant::__as(std::declval<std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>()))>::type>::type&&>>::type std::visit<doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const::'lambda'(auto, auto), std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>>(auto&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&, std::variant<std::integral_constant<bool, false>, std::integral_constant<bool, true>>&&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/variant:1859:9
    #10 0x55cb5d676604 in doris::vectorized::FunctionStringParseUrl::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const /root/doris/be/src/vec/functions/function_string.h:2783:13
    #11 0x55cb51a43fd4 in doris::vectorized::DefaultExecutable::execute_impl(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long) const /root/doris/be/src/vec/functions/function.h:434:26
    #12 0x55cb583f7dff in 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 /root/doris/be/src/vec/functions/function.cpp:119:16
    #13 0x55cb583e6de9 in 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 /root/doris/be/src/vec/functions/function.cpp:244:12
    #14 0x55cb583e5f53 in doris::vectorized::PreparedFunctionImpl::default_implementation_for_nulls(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long, bool, bool*) const /root/doris/be/src/vec/functions/function.cpp:216:9
    #15 0x55cb583f7939 in 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 /root/doris/be/src/vec/functions/function.cpp:110:5
    #16 0x55cb583e6de9 in 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 /root/doris/be/src/vec/functions/function.cpp:244:12
    #17 0x55cb583e7069 in doris::vectorized::PreparedFunctionImpl::execute(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long, bool) const /root/doris/be/src/vec/functions/function.cpp:250:12
    #18 0x55cb51a3fd95 in doris::vectorized::IFunctionBase::execute(doris::FunctionContext*, doris::vectorized::Block&, std::vector<unsigned int, std::allocator<unsigned int>> const&, unsigned int, unsigned long, bool) const /root/doris/be/src/vec/functions/function.h:193:19
    #19 0x55cb51a2797f in doris::vectorized::VectorizedFnCall::_do_execute(doris::vectorized::VExprContext*, doris::vectorized::Block*, int*, std::vector<unsigned int, std::allocator<unsigned int>>&) /root/doris/be/src/vec/exprs/vectorized_fn_call.cpp:187:5
    #20 0x55cb51a28a77 in doris::vectorized::VectorizedFnCall::execute(doris::vectorized::VExprContext*, doris::vectorized::Block*, int*) /root/doris/be/src/vec/exprs/vectorized_fn_call.cpp:220:12
    #21 0x55cb51b5f3b4 in doris::vectorized::VExprContext::execute(doris::vectorized::Block*, int*) /root/doris/be/src/vec/exprs/vexpr_context.cpp:61:5
    #22 0x55cb519a6732 in doris::vectorized::Scanner::_do_projections(doris::vectorized::Block*, doris::vectorized::Block*) /root/doris/be/src/vec/exec/scan/scanner.cpp:200:9
    #23 0x55cb519a1b13 in doris::vectorized::Scanner::get_block_after_projects(doris::RuntimeState*, doris::vectorized::Block*, bool*) /root/doris/be/src/vec/exec/scan/scanner.cpp:82:16
    #24 0x55cb5192a59d in doris::vectorized::ScannerScheduler::_scanner_scan(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>) /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:241:5
    #25 0x55cb51931c38 in doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()::operator()() const::'lambda'()::operator()() const /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:148:21
    #26 0x55cb519314ef in doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()::operator()() const /root/doris/be/src/vec/exec/scan/scanner_scheduler.cpp:147:31
    #27 0x55cb519312fe in void std::__invoke_impl<void, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()&>(std::__invoke_other, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61:14
    #28 0x55cb5193123e in std::enable_if<is_invocable_r_v<void, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()&>, void>::type std::__invoke_r<void, doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()&>(doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:111:2
    #29 0x55cb51930e45 in std::_Function_handler<void (), doris::vectorized::ScannerScheduler::submit(std::shared_ptr<doris::vectorized::ScannerContext>, std::shared_ptr<doris::vectorized::ScanTask>)::$_1::operator()() const::'lambda'()>::_M_invoke(std::_Any_data const&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:290:9
    #30 0x55cb216f8e3f in std::function<void ()>::operator()() const /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:591:9
    #31 0x55cb51940ec6 in doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()::operator()() const /root/doris/be/src/vec/exec/scan/scanner_scheduler.h:149:65
    #32 0x55cb51940e7e in void std::__invoke_impl<void, doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()&>(std::__invoke_other, doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61:14
    #33 0x55cb51940dbe in std::enable_if<is_invocable_r_v<void, doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()&>, void>::type std::__invoke_r<void, doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()&>(doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:111:2
    #34 0x55cb51940745 in std::_Function_handler<void (), doris::vectorized::SimplifiedScanScheduler::submit_scan_task(doris::vectorized::SimplifiedScanTask)::'lambda'()>::_M_invoke(std::_Any_data const&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:290:9
    #35 0x55cb216f8e3f in std::function<void ()>::operator()() const /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:591:9
    #36 0x55cb28bd9844 in doris::FunctionRunnable::run() /root/doris/be/src/util/threadpool.cpp:64:27
    #37 0x55cb28bb84b9 in doris::ThreadPool::dispatch_thread() /root/doris/be/src/util/threadpool.cpp:616:24
    #38 0x55cb28bfd263 in void std::__invoke_impl<void, void (doris::ThreadPool::*&)(), doris::ThreadPool*&>(std::__invoke_memfun_deref, void (doris::ThreadPool::*&)(), doris::ThreadPool*&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:74:14
    #39 0x55cb28bfd068 in std::__invoke_result<void (doris::ThreadPool::*&)(), doris::ThreadPool*&>::type std::__invoke<void (doris::ThreadPool::*&)(), doris::ThreadPool*&>(void (doris::ThreadPool::*&)(), doris::ThreadPool*&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:96:14
    #40 0x55cb28bfcfa0 in void std::_Bind<void (doris::ThreadPool::* (doris::ThreadPool*))()>::__call<void, 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/functional:506:11
    #41 0x55cb28bfcd95 in void std::_Bind<void (doris::ThreadPool::* (doris::ThreadPool*))()>::operator()<void>() /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/functional:591:17
    #42 0x55cb28bfcc8e in void std::__invoke_impl<void, std::_Bind<void (doris::ThreadPool::* (doris::ThreadPool*))()>&>(std::__invoke_other, std::_Bind<void (doris::ThreadPool::* (doris::ThreadPool*))()>&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61:14
    #43 0x55cb28bfcbce in 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*))()>&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:111:2
    #44 0x55cb28bfc665 in std::_Function_handler<void (), std::_Bind<void (doris::ThreadPool::* (doris::ThreadPool*))()>>::_M_invoke(std::_Any_data const&) /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:290:9
    #45 0x55cb216f8e3f in std::function<void ()>::operator()() const /root/ldb_toolchain/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:591:9
    #46 0x55cb28b74241 in doris::Thread::supervise_thread(void*) /root/doris/be/src/util/thread.cpp:498:5
    #47 0x55cb2142be0a in asan_thread_start(void*) crtstuff.c
    #48 0x7f17840221c9 in start_thread (/lib64/libpthread.so.0+0x81c9) (BuildId: 7c4add5c7a885e6ff4ce17867d6a2286e4420eec)
    #49 0x7f1784a118d2 in clone (/lib64/libc.so.6+0x398d2) (BuildId: 4ee3325955e3b55b6805f33959b7cb77745ad625)