[BUG] BE may core when FE get_stream_load_record

[stdpain]

Describe the bug

palo_be: /home/users/fenghaoan/doris/thirdparty-gcc10/installed/include/rapidjson/document.h:1645: int rapidjson::GenericValue<Encoding, Allocator>::GetInt() const [with Encoding = rapidjson::UTF8<>; Allocator = rapidjson::MemoryPoolAllocator<>]: Assertion `data_.f.flags & kIntFlag' failed.
*** Aborted at 1622017736 (unix time) try "date -d @1622017736" if you are using GNU date ***
PC: @     0x7fa5d73adf20 __GI_raise
*** SIGABRT (@0x550060000da32) received by PID 55858 (TID 0x7fa4e7a77700) from PID 55858; stack trace: ***
    @          0x41aaa52 google::(anonymous namespace)::FailureSignalHandler()
    @     0x7fa5d76851d0 (unknown)
    @     0x7fa5d73adf20 __GI_raise
    @     0x7fa5d7399523 __GI_abort
    @     0x7fa5d739940f __assert_fail_base.cold
    @     0x7fa5d73a6952 __GI___assert_fail
    @          0x2673621 rapidjson::GenericValue<>::GetInt()
    @          0x2b891d9 doris::StreamLoadContext::parse_stream_load_record()
    @          0x2ba9dd1 doris::BackendService::get_stream_load_record()
    @          0x2d06077 doris::BackendServiceProcessor::process_get_stream_load_record()
    @          0x2cfd223 doris::BackendServiceProcessor::dispatchCall()
    @          0x25c4b4f apache::thrift::TDispatchProcessor::process()
    @          0x4198355 apache::thrift::server::TConnectedClient::run()
    @          0x4194818 apache::thrift::concurrency::PthreadThread::threadMain()
    @     0x7fa5d767af84 start_thread
    @     0x7fa5d746addf __GI___clone

To Reproduce
Steps to reproduce the behavior:

1. use stream load a file greater than 2G
2. wait a long monment be will core

Expected behavior
Be shouldn't core

Version
master