nishantmonu51 commented on a change in pull request #5958: Part 2 of changes for SQL Compatible Null Handling URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r201373058
########## File path: extensions-core/lookups-cached-single/src/main/java/io/druid/server/lookup/LoadingLookup.java ########## @@ -62,15 +63,19 @@ public LoadingLookup( @Override - public String apply(final String key) + public String apply(@Nullable final String key) { - if (key == null) { + String keyEquivalent = NullHandling.nullToEmptyIfNeeded(key); Review comment: this is to preserve backwards compatibility, previously, nulls and empty strings were considered same. and if a looking has mapping "" -> "someval" then all nulls/empty strings will be resolved to "someval". ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@druid.apache.org For additional commands, e-mail: dev-h...@druid.apache.org