Thomas Powell created ARROW-16005:
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Summary: [Java] JDBC-to-Arrow: Arrays do not work with
ArrowVectorIterator
Key: ARROW-16005
URL: https://issues.apache.org/jira/browse/ARROW-16005
Project: Apache Arrow
Issue Type: Bug
Components: Java
Affects Versions: 7.0.0
Reporter: Thomas Powell
{{ArrowVectorIterator}} does not currently work with arrays.
One issue is that initializing the {{ArrayConsumer}} requires
{{ListVector#getDataVector}} but currently this is called before the
{{VectorSchemaRoot}} is initialized so there is no {{ListVector}} to pass:
[https://github.com/apache/arrow/blob/master/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/ArrowVectorIterator.java#L76.]
{code:java}
Caused by: java.lang.NullPointerException: Cannot invoke
"org.apache.arrow.vector.complex.ListVector.getDataVector()" because "vector"
is null
at
org.apache.arrow.adapter.jdbc.JdbcToArrowUtils.getConsumer(JdbcToArrowUtils.java:432)
at
org.apache.arrow.adapter.jdbc.ArrowVectorIterator.initialize(ArrowVectorIterator.java:74)
at
org.apache.arrow.adapter.jdbc.ArrowVectorIterator.create(ArrowVectorIterator.java:91)
... 72 more {code}
A second issue comes when there are multiple batches.
{{ArrayConsumer#resetValueVector}} does not currently do anything with the
delegate. As a result, {{ListVector#dataVector}} does not have its index reset
which is an issue when reusing the {{{}VectorSchemaRoot{}}}.
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