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Cascalog invert index #1

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Cascalog invert index #1

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aa5a628
add inverted index example for cascalog
BertrandDechoux Jul 5, 2012
41ebe0c
update README
BertrandDechoux Jul 5, 2012
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -13,5 +13,6 @@ A collection of MapReduce tasks translated (from Pig, Hive, MapReduce streaming,
* [Pig](https://github.com/echen/rosetta-scone/blob/master/distributed-grep/distributed-grep.pig)
* [Inverted Index](https://github.com/echen/rosetta-scone/tree/master/inverted-index)
* [Scalding](https://github.com/echen/rosetta-scone/blob/master/inverted-index/InvertedIndex.scala)
* [Cascalog](https://github.com/echen/rosetta-scone/blob/master/inverted-index/inverted-index.clj)
* [Hadoop Streaming](https://github.com/echen/rosetta-scone/blob/master/inverted-index/inverted_index.rb)
* [Pig](https://github.com/echen/rosetta-scone/blob/master/inverted-index/inverted-index.pig)
25 changes: 25 additions & 0 deletions inverted-index/inverted-index.clj
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;;;; Invert index in Cascalog.

;; bootstrap
(use 'cascalog.playground)(bootstrap)

;; define the data
(def index [
[0 "Hello World"]
[101 "The quick brown fox jumps over the lazy dog"]
[42 "Answer to the Ultimate Question of Life, the Universe, and Everything"]
])

;; the tokenize function
(defmapcatop tokenize [text]
(seq (.split text "\\s+")))

;; ensure inverted index is distinct per word
(defbufferop distinct-vals [tuples]
(list (set (map first tuples))))

;; run the query on data
(?<- (stdout) [?word ?ids]
(index ?id ?text)
(tokenize ?text :> ?word)
(distinct-vals ?id :> ?ids))