[jira] [Created] (ARROW-326) ComplexWriter should initialize nested writers when container vector is already populated

["Steven Phillips (JIRA)" <ji...@apache.org>]

Steven Phillips created ARROW-326:
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             Summary: ComplexWriter should initialize nested writers when container vector is already populated
                 Key: ARROW-326
                 URL: https://issues.apache.org/jira/browse/ARROW-326
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Steven Phillips
            Assignee: Steven Phillips


It's possible and sometimes useful to use reuse a nested vector that was populated in a previous ComplexWriter. The new ComplexWriter should be aware of the fields that are present in the vector.

As it is right now, if a particular column were determined to be a specific type (or a union type), but the new writer finds a new type, the original type may be thrown out. What should happen is that the type should be promoted to union (or have a new subtype added to the union field).



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