[VL] flaky CSV tests

[zhouyuan]

Backend

VL (Velox)

Bug description

- csv scan with option string as null
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f9dbf4fa424, pid=1861, tid=6841
#
# JRE version: OpenJDK Runtime Environment 21.9 (17.0.1+12) (build 17.0.1+12-LTS)
# Java VM: OpenJDK 64-Bit Server VM 21.9 (17.0.1+12-LTS, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x290424]  AccessInternal::PostRuntimeDispatch<G1BarrierSet::AccessBarrier<548964ul, G1BarrierSet>, (AccessInternal::BarrierType)2, 548964ul>::oop_access_barrier(void*)+0x4
#
# Core dump will be written. Default location: Core dumps may be processed with "/lib/systemd/systemd-coredump %P %u %g %s %t 9223372036854775808 %h" (or dumping to /__w/incubator-gluten/incubator-gluten/backends-velox/core.1861)
#
# An error report file with more information is saved as:
# /__w/incubator-gluten/incubator-gluten/backends-velox/hs_err_pid1861.log
#
# If you would like to submit a bug report, please visit:
#   https://bugzilla.redhat.com/enter_bug.cgi?product=Red%20Hat%20Enterprise%20Linux%208&component=java-17-openjdk

Spark version

None

Spark configurations

No response

System information

No response

Relevant logs