Cascading template tap example using Cascalog

gistfile1.clj

;; dumps data into directories based on template, à la
;; /tmp/test-template/2012-01-01/a/part-00000
;; /tmp/test-template/2012-01-01/b/part-00000
;; /tmp/test-template/2013-12-31/a/part-00000

(let [src [["2012-01-01" "a" 2]
           ["2012-01-01" "b" 3]
           ["2013-12-31" "a" 4]]]
  (?- (hfs-seqfile "/tmp/test-template"
                   :sink-template "%s/%s"
                   :templatefields ["?a" "?b"]
                   :outfields ["?c"])
      (<- [?a ?b ?c]
          (src ?a ?b ?c))))