stdpain opened a new issue #5951:
URL: https://github.com/apache/incubator-doris/issues/5951
**Describe the bug**
```
==3930==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60c000000878 at pc 0x000000ae00ce bp 0x7ffeb16aa660 sp 0x7ffeb16aa658
READ of size 8 at 0x60c000000878 thread T0
#0 0xae00cd in
doris::StringFunctions::substring(doris_udf::FunctionContext*,
doris_udf::StringVal const&, doris_udf::IntVal const&, doris_udf::IntVal
const&) ../src/exprs/string_functions.cpp:98
#1 0xa3f24e in doris::StringFunctionsTest_substring_Test::TestBody()
../test/exprs/string_functions_test.cpp:295
#2 0x15d9d2d in void
testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test,
void>(testing::Test*, void (testing::Test::*)(), char const*)
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15d9d2d)
#3 0x15d4bef in void
testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,
void>(testing::Test*, void (testing::Test::*)(), char const*)
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15d4bef)
#4 0x15bb21b in testing::Test::Run()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15bb21b)
#5 0x15bba45 in testing::TestInfo::Run()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15bba45)
#6 0x15bc092 in testing::TestCase::Run()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15bc092)
#7 0x15c28fd in testing::internal::UnitTestImpl::RunAllTests()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15c28fd)
#8 0x15dad0a in bool
testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,
bool>(testing::internal::UnitTestImpl*, bool
(testing::internal::UnitTestImpl::*)(), char const*)
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15dad0a)
#9 0x15d58c1 in bool
testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,
bool>(testing::internal::UnitTestImpl*, bool
(testing::internal::UnitTestImpl::*)(), char const*)
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15d58c1)
#10 0x15c1643 in testing::UnitTest::Run()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x15c1643)
#11 0xa7f918 in RUN_ALL_TESTS()
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0xa7f918)
#12 0xa74d55 in main ../test/exprs/string_functions_test.cpp:642
#13 0x7f7afa4d3b8a in __libc_start_main ../csu/libc-start.c:308
#14 0x9609b9 in _start
(/opt/stdpain/doris/baidu/bdg/doris/core/be/ut_build_ASAN/test/exprs/string_functions_test+0x9609b9)
```
**To Reproduce**
```
select substring('abc', 0, 2);
```
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