cambyzju opened a new pull request, #30738:
URL: https://github.com/apache/doris/pull/30738
## Proposed changes
While read orc data through multi-catalog, if column type in meta is string,
but the real data type is INT or Timestamp or others, it may make be crash:
```
(gdb) bt
#0 0x00007f73c30c2387 in raise () from /lib64/libc.so.6
#1 0x00007f73c30c3a78 in abort () from /lib64/libc.so.6
#2 0x000056552fad78b9 in ?? ()
#3 0x000056552faccecd in google::LogMessage::Fail() ()
#4 0x000056552facf409 in google::LogMessage::SendToLog() ()
#5 0x000056552facca36 in google::LogMessage::Flush() ()
#6 0x000056552facfa79 in google::LogMessageFatal::~LogMessageFatal() ()
#7 0x000056552b76b115 in
doris::vectorized::ColumnString::check_chars_length (element_number=<optimized
out>, total_length=<optimized out>,
this=<optimized out>) at
/data/doris-1.x/be/src/vec/columns/column_string.h:66
#8 doris::vectorized::ColumnString::insert_many_strings (this=<optimized
out>, strings=<optimized out>, num=4064)
at /data/doris-1.x/be/src/vec/columns/column_string.h:270
#9 0x000056552f66548c in
doris::vectorized::OrcReader::_decode_string_column
(this=this@entry=0x7f726d3b6a00, col_name=..., data_column=...,
type_kind=@0x7f67b47bc0e0: orc::TIMESTAMP, cvb=cvb@entry=0x7f6d98aadd60,
num_values=4064)
at /data/doris-1.x/be/src/vec/exec/format/orc/vorc_reader.cpp:649
#10 0x000056552f670300 in
doris::vectorized::OrcReader::_orc_column_to_doris_column
(this=this@entry=0x7f726d3b6a00, col_name=..., doris_column=...,
data_type=..., orc_column_type=0x7f6d96907440, cvb=0x7f6d98aadd60,
num_values=4064) at
/data/doris-1.x/be/src/vec/exec/format/orc/vorc_reader.cpp:738
#11 0x000056552f672d50 in doris::vectorized::OrcReader::get_next_block
(this=0x7f726d3b6a00, block=0x7f6d7fe59b20, read_rows=0x7f67b47bc318,
eof=<optimized out>) at
/data/doris-1.x/be/src/vec/exec/format/orc/vorc_reader.cpp:788
#12 0x000056552f633ad8 in doris::vectorized::VFileScanner::_get_block_impl
(this=0x7f6f051b3a00, state=<optimized out>, block=0x7f6d7fe59b20,
eof=0x7f67b47bc539) at
/data/doris-1.x/be/src/vec/exec/scan/vfile_scanner.cpp:155
#13 0x000056552f5ff329 in doris::vectorized::VScanner::get_block
(this=this@entry=0x7f6f051b3a00, state=state@entry=0x7f6d70a61900,
block=block@entry=0x7f6d7fe59b20, eof=eof@entry=0x7f67b47bc539) at
/data/doris-1.x/be/src/vec/exec/scan/vscanner.cpp:54
#14 0x000056552f5fc682 in doris::vectorized::ScannerScheduler::_scanner_scan
(this=<optimized out>, scheduler=<optimized out>, ctx=0x7f6f007bdc00,
scanner=0x7f6f051b3a00) at
/data/doris-1.x/be/src/vec/exec/scan/scanner_scheduler.cpp:247
#15 0x000056552a903b15 in std::function<void ()>::operator()() const
(this=<optimized out>) at
/var/local/ldb-toolchain/include/c++/11/bits/std_function.h:560
#16 doris::FunctionRunnable::run (this=<optimized out>) at
/data/doris-1.x/be/src/util/threadpool.cpp:46
#17 doris::ThreadPool::dispatch_thread (this=0x7f739ad6b180) at
/data/doris-1.x/be/src/util/threadpool.cpp:535
#18 0x000056552a8f8f6f in std::function<void ()>::operator()() const
(this=0x7f7267d7da38) at
/var/local/ldb-toolchain/include/c++/11/bits/std_function.h:560
#19 doris::Thread::supervise_thread (arg=0x7f7267d7da20) at
/data/doris-1.x/be/src/util/thread.cpp:454
#20 0x00007f73c2e77ea5 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f73c318a9fd in ioperm () from /lib64/libc.so.6
#22 0x0000000000000000 in ?? ()
```
Here we expect `orc::StringVectorBatch*`, but the real type is
`orc::TimestampVectorBatch*`:
<img width="1167" alt="image"
src="https://github.com/apache/doris/assets/10771715/ffbfc127-f1d8-4a42-ada3-18755d8a8aad";>
In the code, we already try to check the cast result:
```
auto* data = down_cast<orc::StringVectorBatch*>(cvb);
if (data == nullptr) {
return Status::InternalError("Wrong data type for colum '{}'",
col_name);
}
```
Unfortunately `down_cast` equals to `static_cast`, because assert do not
work in release build type.
```
template <typename To, typename From> // use like this: down_cast<T*>(foo);
inline To down_cast(From* f) { // so we only accept pointers
// Ensures that To is a sub-type of From *. This test is here only
// for compile-time type checking, and has no overhead in an
// optimized build at run-time, as it will be optimized away
// completely.
// TODO(user): This should use COMPILE_ASSERT.
if (false) {
::implicit_cast<From*, To>(NULL);
}
// uses RTTI in dbg and fastbuild. asserts are disabled in opt builds.
assert(f == NULL || dynamic_cast<To>(f) != NULL);
return static_cast<To>(f);
}
```
While we build release version, we define `NDEBUG` to turn off assert
```
# For CMAKE_BUILD_TYPE=Release
# -O3: Enable all compiler optimizations
# -DNDEBUG: Turn off dchecks/asserts/debug only code.
set(CXX_FLAGS_RELEASE "${CXX_GCC_FLAGS} -O3 -DNDEBUG")
```
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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