[WIP] druid-hive integration

[navis]

Based on #2282. This is the first try to integrate druid with hive.

create table <table-name> (<column-schema>...)
STORED BY "io.druid.hive.DruidHiveStorageHandler" 
TBLPROPERTIES (
  "druid.broker.address"="<broker-address>", 
  "druid.datasource"="<datasource>"
);

tested on hive-2.0 with MR/TEZ. needs configuration hive.optimize.index.filter=true (hive-site.xml) and mapreduce.job.user.classpath.first=true (hadoop mapred-site.xml)

[jaehc]

I am just wondering it is necessary to shuffle the segments list?

[xvrl]

@navis it's a bit confusing to have the same code changes in two different PRs. We're getting comments in both, which makes it hard to track the ones that are addressed or not. Maybe we should close one of the PRs?

[navis]

@xvrl Sorry, I thought WIP in title can make others skip reviewing. I'll close this, for now.