[ZEPPELIN-559] Cassandra interpreter v2

[doanduyhai]

What is this PR for?

• Update the Cassandra interpreter to V2 to support new schema commands to describe Cassandra 3.x features:
  • User Defined Functions
  • User Defined Aggregates
  • Materialized Views
• Add support for single line comment using double slashes (//)
• Add DESCRIBE TYPES
• The Java driver version is bumped to 3.0.0-rc1
• The contextual HELP menu is also updated and a ChangeLog section is added.

What type of PR is it?

[Improvement]

Todos

• - Add new PR to update official Cassandra interpreter with new features
• - Test steps executed and confirmed working by the community
• - Code review by the community (warning, Scala inside)

Is there a relevant Jira issue?

ZEPPELIN-559
ZEPPELIN-575 for doc

How should this be tested?

1. Download and install locally Cassandra 3.1.1
2. Start Cassandra
3. Clone this pull request locally with:
   1. git fetch origin pull/600/head:CassandraInterpreterV2
   2. git checkout CassandraInterpreterV2
4. Build this version of Zeppelin with mvn clean package -DskipTests
5. Start Zeppelin and update the property cassandra.hosts of the Cassandra interpreter (set it to localhost or 127.0.0.1 depending on your configuration)
6. In a paragraph, execute all the CQL statements given in this CassandraInterpreterV2TestData.cql by copy-pasting them
7. Start a new %cassandra paragraph and execute DESCRIBE FUNCTION test.maxOf;. You should be able to see:
   
8. Start a new %cassandra paragraph and execute DESCRIBE AGGREGATE test.group_by;. You should be able to see:
   
9. Start a new %cassandra paragraph and execute DESCRIBE MATERIALIZED VIEW test.user_by_country;. You should be able to see:
   
10. Start a new %cassandra paragraph and execute SELECT id,val1,val2,maxOf(val1,val2) FROM test.test_max;. You should be able to see:
    
11. Start a new %cassandra paragraph and execute SELECT group_by(category,sales_count) FROM test.items;. You should be able to see:
    
12. Start a new %cassandra paragraph and execute SELECT * FROM test.user_by_country WHERE country='FR';. You should be able to see:
    

Questions:

• Does the licenses files need update? --> No
• Is there breaking changes for older versions? --> No
• Does this needs documentation? --> Yes

[corneadoug]

@doanduyhai thanks for the contribution, I know you gave some details in the JIRA issue, but could you update this PR description with our PR template? (https://github.com/apache/incubator-zeppelin/blob/master/CONTRIBUTING.md#creating-a-pull-request)

[victorcouste]

Just checked the full process, Cassandra interpreter v2 and new CQL scripts, all is ok

[Leemoonsoo]

@doanduyhai Great improvement! Somehow last commit didn't trigger CI. Could you trigger CI for last commit?

[brianwawok]

Are these Options? A more idiomatic way to do this would be
parsed should be Some(List(DescribeFunctionCmd(None,"toto")))

[doanduyhai]

Agree, will update the code to use more idiomatic Scala Option

[doanduyhai]

@corneadoug@Leemoonsoo

Code review has been done by @brianwawok and I pushed some refactoring.

The build succeeded but Travis marked it as failed because : The log length has exceeded the limit of 4 Megabytes (this usually means that test suite is raising the same exception over and over)

Looks like this is a very common issue with Travis, it is reported here: travis-ci/travis-ci#3865

[doanduyhai]

@Leemoonsoo@corneadoug Finally successful build

[corneadoug]

Those headers :)
I don't usually review interpreters, but I will test it out :)

[Leemoonsoo]

Thanks @doanduyhai for big improvement!
LGTM

[felixcheung]

LGTM. Any more comments or discussion on this PR?

[Leemoonsoo]

Merge if there're no more discussions

[felixcheung]

Tested, very nice interpreter thank you @doanduyhai !
A small amendment: to test this, make sure UDF sandbox is enabled in conf/cassandra.yaml
enable_user_defined_functions: true

Let's merge it