jihoonson commented on a change in pull request #10869:
URL: https://github.com/apache/druid/pull/10869#discussion_r573469703
##########
File path:
core/src/main/java/org/apache/druid/guice/GuiceAnnotationIntrospector.java
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@@ -101,13 +103,28 @@ public Object findInjectableValueId(AnnotatedMember m)
// delegate creators. I'm not 100% sure why it's not called, but guess
it's because the argument
// is some Java type that Jackson already knows how to deserialize. Since
there is only one argument,
// Jackson perhaps is able to just deserialize it without introspection.
+
if (ac instanceof AnnotatedParameter) {
final AnnotatedParameter ap = (AnnotatedParameter) ac;
if (ap.hasAnnotation(JsonProperty.class)) {
return JsonIgnoreProperties.Value.empty();
}
}
- return JsonIgnoreProperties.Value.forIgnoredProperties("");
+ // A map can have empty string keys e.g.
https://github.com/apache/druid/issues/10859. By returning empty ignored
+ // list for map, we can allow for empty string keys in a map. A nested
class within map
+ // can still be annotated with JacksonInject and still be
non-deserializable from user input
+ // Refer to {@link
com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.createMapDeserializer}
for details
+ // on how the ignored list is passed to map deserializer
+ if (ac instanceof AnnotatedClass) {
Review comment:
@Gabriel39 the bug is that the empty string key in a `Map` is not
deserialized. When you have a class that has a map as a field, this method will
be called for both the outer class and the map.
`MapLookupExtractionFnSerDeTest` is improved in this PR to test the case where
a `MapLookupExtractor` has a map that has an empty string key. That test will
fail without this block.
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