Cascalog: Clojure-based Query Language for Hadoop
From the post:
Cascalog, introduced in the linked article, is a query language for Hadoop featuring:
- Simple – Functions, filters, and aggregators all use the same syntax. Joins are implicit and natural.
- Expressive – Logical composition is very powerful, and you can run arbitrary Clojure code in your query with little effort.
- Interactive – Run queries from the Clojure REPL.
- Scalable – Cascalog queries run as a series of MapReduce jobs.
- Query anything – Query HDFS data, database data, and/or local data by making use of Cascading’s “Tap” abstraction
- Careful handling of null values – Null values can make life difficult. Cascalog has a feature called “non-nullable variables” that makes dealing with nulls painless.
- First class interoperability with Cascading – Operations defined for Cascalog can be used in a Cascading flow and vice-versa
- First class interoperability with Clojure – Can use regular Clojure functions as operations or filters, and since Cascalog is a Clojure DSL, you can use it in other Clojure code.
From Alex Popescu’s myNoSQL
There are a number of NoSQL query languages.
Which should be considered alongside TMQL4J in TMQL discussions.