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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