[C++] Cast kernels cannot write into sliced output array

[asfimport]

If the offset is non-zero, the results will be written into the wrong location:

https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/cast.cc#L218

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• C++/Python: Add cast function on Column-level (is related to)

PRs and other links:

• GitHub Pull Request #1368
• GitHub Pull Request #1369

_{Note: This issue was originally created as ARROW-1735. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
I believe this is fixed in 30158ad but we will want to add tests to assert the expected behavior for certain

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 1369
#1369