Bryan Cutler created ARROW-2594:
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Summary: Vector reallocation does not properly clear reused buffers
Key: ARROW-2594
URL: https://issues.apache.org/jira/browse/ARROW-2594
Project: Apache Arrow
Issue Type: Bug
Components: Java - Vectors
Reporter: Bryan Cutler
Assignee: Bryan Cutler
When reallocating a vector buffer, it assumes that the first half of the new
buffer was clean or populated from the previous and only zeros out the second
half. This is not the case if the vector has released the buffer and the
current capacity is 0 (empty). If the new buffer has values set, then they
will cause bogus values when used in the vector.
I came across this when looking into SPARK-23030, due to the comment here
https://github.com/apache/spark/pull/21312#issuecomment-389035697
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