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https://issues.apache.org/jira/browse/CRUNCH-547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14639392#comment-14639392
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Adric Eckstein commented on CRUNCH-547:
---------------------------------------
Makes sense, and I don't think it really affects anything I'm doing. Just
wanted to make sure I wasn't missing some core concept in there.
> AvroType operators can create nested unions
> -------------------------------------------
>
> Key: CRUNCH-547
> URL: https://issues.apache.org/jira/browse/CRUNCH-547
> Project: Crunch
> Issue Type: Bug
> Components: IO
> Reporter: Adric Eckstein
> Fix For: 0.13.0
>
> Attachments: CRUNCH-547.patch, CRUNCH-547b.patch
>
>
> When using avro reflection to create PTypes, the type might represent a union
> type, as specified by the @Union annotation. Derived types from this, such
> as tableOf() and collections() will create a null union from this (already
> union) type and create a nested union which throws an AvroRuntimeException.
> @org.apache.avro.reflect.Union({ Foo1.class, Foo2.class })
> public static interface Foo {
> public String getFoo();
> }
> public static class Foo1 implements Foo {
> private final Double value = 1.0;
> @Override
> public String getFoo() {
> return value.toString();
> }
> }
> public static class Foo2 implements Foo {
> private final Integer value = 2;
> @Override
> public String getFoo() {
> return value.toString();
> }
> }
> Schema schema = ReflectData.get().getSchema(Foo.class);
> AvroType<Foo> ptype = Avros.reflects(Foo.class, schema);
> Avros.tableOf(Avros.strings(), ptype);
> Avros.collections(ptype);
> Exception in thread "main" org.apache.avro.AvroRuntimeException: Nested
> union: [["double","string"],"null"]
> ...
> Seems like the methods Avros.allowNulls() and AvroTableType.nullable() both
> are calling Schema.createUnion(unionSchema, nullSchema), and could add an
> extra case statement to use the already existing union schema.
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