[jira] [Created] (ARROW-665) C++: Move zeroing logic for (re)allocations to the Allocator

["Uwe L. Korn (JIRA)" <ji...@apache.org>]

Uwe L. Korn created ARROW-665:
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             Summary: C++: Move zeroing logic for (re)allocations to the Allocator
                 Key: ARROW-665
                 URL: https://issues.apache.org/jira/browse/ARROW-665
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Uwe L. Korn


Instead of doing this in e.g. the builders, we should move this logic to the Allocator. For example, jemalloc provides a flag {{MALLOCX_ZERO}} to indicate that an allocated region should be zeroed. The POSIX API also provides the (sadly unaligned) {{calloc}} call that returns zeroed pages. 

The speciality here is that the pages may already be zeroed by the OS for security reasons (i.e. so that one process does not see the content of the process that previously owned this page).



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