Oleksii Diagiliev

Hi @ljw7630 , I'm not aware of Redis that doesn't support scan, could you please share more information regarding that? Spark-redis relies on scan heavily, so I'm not sure how...

The PR for this is #156

It looks like some of the rows of your DataFrame have `null` key. The key is specified with "key.column" option.

Hi @songzhiyong , it fails while executing [INFO command](https://redis.io/commands/info). Could you try to connect to the server with the same credentials and try to execute `INFO`?

You can try to ask in https://github.com/redis/redis

Hi @karthick30121990, it looks like something is wrong with your classpath, Scala is missing there. How do you run it?

Hi Justin, Thanks for the PR! Some unit tests failing on [Travis](https://travis-ci.org/RedisLabs/spark-redis/builds/521144369?utm_source=github_status&utm_medium=notification), could you please take a look?

@justinrmiller The issue is that HLL datastructure is implemented in Redis as a String: ``` 127.0.0.1:6379> PFADD hll-test a a b (integer) 1 127.0.0.1:6379> type hll-test string 127.0.0.1:6379> get hll-test...

@justinrmiller to run all the tests just execute `make test` in terminal If you'd like to debug individual test in IDE you can start redis test instances with `make start`...

Hi @justinrmiller, Would you have some time to address the review comments? If not, I can take over from here if you'd like.