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;;
;;
;; Copyright 2015 Netflix, Inc.
;;
;; Licensed under the Apache License, Version 2.0 (the "License");
;; you may not use this file except in compliance with the License.
;; You may obtain a copy of the License at
;;
;; http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.
;;
;;
(ns pigpen.cascading.oven
(:require [pigpen.oven]))
(defn merge-reduce-fold
"Merges a reduce command followed by a fold operation"
[_ commands]
(let [lookup (->> commands
(map (juxt :id identity))
(into {}))]
(->> commands
(map (fn [c]
(let [a (some-> c :ancestors first lookup)]
(if (and (-> c :type #{:project})
(-> a :type #{:reduce})
(->> c
:projections
(some (comp #{:fold} :udf :expr))))
{:type :reduce-fold
:id (:id c)
:ancestors (:ancestors a)
:reduce a
:fold c}
c)))))))
(defn merge-group-fold
"Merges a group command followed by a fold operation"
[_ commands]
(let [lookup (->> commands
(map (juxt :id identity))
(into {}))]
(->> commands
(map (fn [c]
(let [a (some-> c :ancestors first lookup)]
(if (and (-> c :type #{:project})
(-> a :type #{:group})
(->> c
:projections
(some (comp #{:fold} :udf :expr))))
{:type :group-fold
:id (:id c)
:ancestors (:ancestors a)
:group a
:fold c}
c)))))))
;; **********
(def default-opts
{})
(defn bake
{:added "0.3.0"}
([query] (bake {} query))
([opts query]
(pigpen.oven/bake
:cascading
{merge-reduce-fold 4.1
merge-group-fold 4.2}
(merge default-opts opts)
query)))