Liya Fan created ARROW-6896:
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Summary: [Java] Vector schema root should not share vectors
Key: ARROW-6896
URL: https://issues.apache.org/jira/browse/ARROW-6896
Project: Apache Arrow
Issue Type: Bug
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
Vector schema root should not share vectors. Otherwise, unexpectd behavior
would happen.
Please note that VectorSchemaRoot is not just a container for vectors, it is
also a resource (it implements the AutoClosable interface), and it manages the
life cycle of its inner vectors.
When two VectorSchemaRoots share vectors, something unexpected may happen.
Consider the following scenario, which is frequently encountered in a SQL
engine.
1. We create a batch:
VectorSchemaRoot oldBatch = ...
2. We add a vector to it, which results in a new batch
VectorSchemaRoot newBatch = oldBatch.addVector(vector);
3. We are done with the old batch, and release the resource
oldBatch.close();
4. We continue to use the new batch, but gets an exception, because some inner
vectors have been released by the old batch.
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