GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/19367
[SPARK-22143][SQL] Fix memory leak in OffHeapColumnVector
## What changes were proposed in this pull request?
`WriteableColumnVector` does not close its child column vectors. This can
create memory leaks for `OffHeapColumnVector` where we do not clean up the
memory allocated by a vectors children. This can be especially bad for string
columns (which uses a child byte column vector).
## How was this patch tested?
I have updated the existing tests to always use both on-heap and off-heap
vectors. Testing and diagnoses was done locally.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-22143
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19367.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19367
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