zebsme commented on issue #15321:
URL: https://github.com/apache/datafusion/issues/15321#issuecomment-2754136554
hi @alamb , Thanks for sharing your great example here. Following your
approach, I noticed that when using an Arrow buffer with mmap as a field in the
Decoder, running the tests produces the following output:
```
thread 'memory_limit::test_stringview_external_sort' panicked at
datafusion/core/tests/memory_limit/mod.rs:468:32:
Query execution failed: ResourcesExhausted("Failed to allocate additional
6643090 bytes for ExternalSorterMerge[0] with 27430266 bytes already allocated
for this reservation - 1410938 bytes remain available for the total pool")
```
It seems that the drop method defined in memmap2 isn't being executed:
```
impl Drop for MmapInner {
fn drop(&mut self) {
let (ptr, len, _) = self.as_mmap_params();
// Any errors during unmapping/closing are ignored as the only way
// to report them would be through panicking which is highly
discouraged
// in Drop impls, c.f.
https://github.com/rust-lang/lang-team/issues/97
unsafe { libc::munmap(ptr, len as libc::size_t) };
}
}
```
However, after switching to using mmap directly as a field, the related
tests passed successfully.
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