josephglanville commented on a change in pull request #10505:
URL: https://github.com/apache/druid/pull/10505#discussion_r649537774
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File path: docs/development/extensions-core/avro.md
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@@ -39,13 +39,24 @@ Make sure to
[include](../../development/extensions.md#loading-extensions) `drui
Druid supports most Avro types natively, there are however some exceptions
which are detailed here.
-`union` types which aren't of the form `[null, otherType]` aren't supported at
this time.
+#### Unions
+Druid has two modes for supporting `union` types. The original legacy mode can
only support unions of the form `[null, otherType]`.
+The newer mode can be enabled by setting `extractUnions` on the Avro parser in
which case unions will be expanded according to the following rules:
Review comment:
No problem, I think you are right and I will make these changes next
week.
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