fix(hashjoin): Resolve dangling pointer access in listNullKeyRows for hash mode tables

[zhli1142015]

This PR addresses an issue in the listNullKeyRows function that occurs in hash
mode. In this function, hashers_ from HashTable is used to construct the new HashLookup.
The joinProbe function requires accessing hashers_[0]->decodedVector().base()
for key comparison. However, this pointer can be dangling, causing the error
described below.
We propose to fix this by adding a flag probeForNullKeyOnly in HashLookup to skip the key comparsion.

[ RUN      ] HashJoinTest/MultiThreadedHashJoinTest.hashModeNullAwareAntiJoinWithFilterAndNullKey/1
unknown file: Failure
C++ exception with description "Exception: VeloxUserError
Error Source: USER
Error Code: INVALID_ARGUMENT
Reason: Specified element is not found : -96
Retriable: False
Function: mapTypeKindToName
File: /var/git/velox/velox/type/Type.cpp
Line: 116
Stack trace:
# 0  facebook::velox::VeloxException::VeloxException(char const*, unsigned long, char const*, std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, bool, facebook::velox::VeloxException::Type, std::basic_string_view<char, std::char_traits<char> >)
# 1  void facebook::velox::detail::veloxCheckFail<facebook::velox::VeloxUserError, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>(facebook::velox::detail::VeloxCheckFailArgs const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
# 2  facebook::velox::mapTypeKindToName[abi:cxx11](facebook::velox::TypeKind const&)
# 3  facebook::velox::exec::HashTable<false>::compareKeys(char const*, facebook::velox::exec::HashLookup&, int)
# 4  facebook::velox::exec::HashTable<false>::joinProbe(facebook::velox::exec::HashLookup&)
# 5  facebook::velox::exec::HashTable<false>::listNullKeyRows(facebook::velox::exec::BaseHashTable::NullKeyRowsIterator*, int, char**)
# 6  facebook::velox::exec::HashProbe::applyFilterOnTableRowsForNullAwareJoin(facebook::velox::SelectivityVector const&, facebook::velox::SelectivityVector&, std::function<int (char**, int)>) [clone .part.0]
# 7  facebook::velox::exec::HashProbe::evalFilterForNullAwareJoin(int, bool)
# 8  facebook::velox::exec::HashProbe::evalFilter(int)
# 9  facebook::velox::exec::HashProbe::getOutputInternal(bool)
# 10 facebook::velox::exec::HashProbe::getOutput()
# 11 facebook::velox::exec::Driver::runInternal(std::shared_ptr<facebook::velox::exec::Driver>&, std::shared_ptr<facebook::velox::exec::BlockingState>&, std::shared_ptr<facebook::velox::RowVector>&)::{lambda()#5}::operator()() const
# 12 facebook::velox::exec::Driver::runInternal(std::shared_ptr<facebook::velox::exec::Driver>&, std::shared_ptr<facebook::velox::exec::BlockingState>&, std::shared_ptr<facebook::velox::RowVector>&)
# 13 facebook::velox::exec::Driver::run(std::shared_ptr<facebook::velox::exec::Driver>)
# 14 void folly::detail::function::call_<facebook::velox::exec::Driver::enqueue(std::shared_ptr<facebook::velox::exec::Driver>)::{lambda()#1}, true, false, void>(, folly::detail::function::Data&)
# 15 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&)
# 16 folly::CPUThreadPoolExecutor::threadRun(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)
# 17 void folly::detail::function::call_<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)>, true, false, void>(, folly::detail::function::Data&)
# 18 0x00000000000dc252
# 19 0x0000000000094ac2
# 20 0x000000000012684f
" thrown in the test body.

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