The trend of these years has been switching from SQL (RDBMS) databases to NoSQL databases like Hadoop, MongoDB, Cassandra, Riak, … 
SQL is a old but easy and fast way to query data. And people STILL look at it for quering Hadoop and bigdata:
- Apache Drill (MapR)
- Apache Phoenix
- Apache Hive (see Stinger initiative)
- Apache Spark SQL
- Presto (Facebook)
- Apache Tajo (a datawarehouse)
- Impala (Cloudera)
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