xxlaykxx commented on PR #837:
URL: https://github.com/apache/arrow-java/pull/837#issuecomment-3341283469
> I guess my question is then, how does this work if we have more than one
extension type (e.g. a struct vector with two extension type fields), given
that everything is based around having 0 or 1 `ExtensionTypeWriterFactory`s?
Because **ExtensionTypeWriterFactory.getWriterImpl** will return a writer
based on vector type, so if will be several extension types -
**getWriterImpl** should just handle this something like
```
if (extensionTypeVector instanceof TimeStampWithPrecisionVector) {
return new TimeStampWithPrecisionWriterImpl(
(TimeStampWithPrecisionVector) extensionTypeVector);
} else if (extensionTypeVector instanceof UuidVector) {
return new UuidWriterImpl((UuidVector) extensionTypeVector);
}
```
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