In recent code snapshot (Github mirror's commit id: c8542b2bd0470af9f8d64bb8133f31828b342604 as today), there is an illogical condition that can be a code smell or a potential bug:
SOLR-3492, it said there was a fix in SOLR-4093. However, the fix still has an issue as above: containsKey will always have null in this if statement. The second condition could be unnecessary. Does leadingWildcards allow a null object as a key? If so, it will return null that might cause NPE in some other locations.
Patch could be just like in