Expected Behavior

As a user, I may want to mute Elasticsearch deprecation warnings, because I cannot fix them immediately and want to prevent flooding logs with repeated messages.

There should be a configuration option in the config file that mutes ES deprecation warnings.

Current Behavior

2021-02-24T08:30:07.169-05:00 WARN  [RestClient] request [GET http://1.1.1.1:9200/_clu

Given a stream s1 that contains a NULL value:

CREATE STREAM s1 (x INTEGER) ...
INSERT INTO s1 (x) VALUES (null);

If that NULL expression is used in an arithmetic operation, the result of the operation will be NULL:

SELECT x + 1 FROM s1 EMIT CHANGES;

However, if a NULL literal is used in the same way, an NPE will be thrown:

ksql> SELECT NULL + 1 FROM

Basically, we don't need to have kafka-console-consumer, we have mill instead: https://github.com/ThreeDotsLabs/watermill/tree/master/tools/mill

It would be nice to replace it in all examples.

我看到可以通过Prometheus搭建监控环境，如果有图文，更容易理解．