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The CloudMdsQL polystore provides integrated access to multiple heterogeneous data stores, such as RDBMS, NoSQL or even HDFS through a big data analytics framework such as MapReduce or Spark. The CloudMdsQL language is a functional SQL-like query language with a flexible nested data model. A major capability is to exploit the full power of each of the underlying data stores by allowing native queries to be expressed as functions and involved in SQL statements. The CloudMdsQL polystore has beendoi:10.1109/bigdata.2016.7840899 dblp:conf/bigdataconf/KolevPLVJP16 fatcat:ro46xbo6j5cl7l7gwakwn24uqe