pitrou opened a new issue, #49229:
URL: https://github.com/apache/arrow/issues/49229
### Describe the bug, including details regarding any error messages,
version, and platform.
When pre-buffering is enabled in the IPC file reader, and a Union array is
encountered with a top-level validity bitmap in a V4 IPC metadata file, this
wouldn't be detected at load time but could later crash with a controlled abort
in `{Sparse,Dense}UnionArray::SetData`.
Found by OSS-Fuzz in https://issues.oss-fuzz.com/issues/482161154
### Component(s)
C++
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