[JAVA] Add support for ExtensionType for UnionWriter

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
java
Domain
data

Research direction

Start by locating UnionWriter and the existing Complex writer support for ExtensionType, then compare how the two writers handle extension values. Confirm the expected behavior from the existing Complex writer implementation and add matching UnionWriter coverage; done means UnionWriter supports ExtensionType consistently with Complex writer.

Written by the indexing model from the issue text.

Description

Type: enhancement
Describe the enhancement requested

Complex writer already supports ExtensionType, UnionWriter should also be updated

Dominant language
Java
Stars
95
Forks
154
Avg merge
2d 10h
Merged PRs (30d)
11

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  4. Open a pull request that references the issue number.

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