Liya Fan created ARROW-5911:
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Summary: [Java] Make ListVector and MapVector create reader lazily
Key: ARROW-5911
URL: https://issues.apache.org/jira/browse/ARROW-5911
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
Current implementation creates reader eagerly, which may cause unnecessary
resource and time. This issue changes the behavior to lazily create the reader.
This is a follow-up issue for ARROW-5897.
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