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core.clj
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core.clj
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(ns orc.core
(:require [taoensso.timbre :as logging]
[taoensso.timbre.appenders.core :as appenders])
(:gen-class))
(def timestamp-opts
{:pattern "yyyy-MM-dd HH:mm:ss" #_:iso8601
:locale :jvm-default #_(java.util.Locale. "en")
:timezone :utc})
(defn configure-logging
([stream level blacklist]
(logging/merge-config!
{ :level level
:timestamp-opts timestamp-opts
:ns-blacklist blacklist
:appenders {
:println (appenders/println-appender {:stream stream})}}))
([stream level]
(configure-logging stream level [])))
(defn get-col
"Return nth column"
[^org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch bat n]
(nth (.cols bat) n))
(defn value
"Returns column value"
[deser bat col-n row-n]
(let [col (get-col bat col-n)]
(deser col row-n)))
(defn row->map
"Return row values as map"
[col-config bat row-n]
(loop [col-n 0
col-conf col-config
rcrd (transient {})]
(if-let [conf (first col-conf)]
(let [val (value (:fn conf) bat col-n row-n)]
(recur (inc col-n) (rest col-conf) (assoc! rcrd col-n val)))
(persistent! rcrd))))
(defn row->vector
"Returns row values as vector"
[col-config bat row-n]
(loop [col-n 0
col-conf col-config
rcrd (transient [])]
(if-let [conf (first col-conf)]
(let [val (value (:fn conf) bat col-n row-n)]
#_(println conf)
(recur (inc col-n) (rest col-conf) (conj! rcrd val)))
(persistent! rcrd))))
(defn rows->maps
"Returns rows as list of maps"
[col-config ^org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch bat]
(let [n-rows (.count bat)]
(loop [row 0
rcrds []]
(if (< row n-rows)
(let [rec (row->map col-config bat row)]
(recur (inc row) (conj rcrds rec)))
rcrds))))
(defn rows->vectors
"Returns rows as list of vectors"
[col-config ^org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch bat]
(let [n-rows (.count bat)]
(loop [row 0
rcrds []]
(if (< row n-rows)
(let [rec (row->vector col-config bat row)]
(recur (inc row) (conj rcrds rec)))
rcrds))))
(defn collector
"Returns row aggregator"
[coll-type]
(case coll-type
:vector rows->vectors
:map rows->maps
(throw (java.lang.Exception. (format "Unsupported collection type: %s" coll-type)))))