ORC SerDe を使用して、ORC データから Athena テーブルを作成します。
シリアル化ライブラリ名
ORC SerDe のシリアル化ライブラリは org.apache.hadoop.hive.ql.io.orc.OrcSerde ですが、CREATE
TABLE ステートメントでは、STORED AS
ORC 句を使用してこれを指定します。ソースコード情報については、GitHub.com の「OrcSerde.java
注記
s3://athena-examples- の myregion/path/to/data/myregion を、Athena が実行されるリージョンの識別子 (s3://athena-examples-us-west-1/path/to/data/ など) に置き換えます。
次の例では、ORC で航空便の遅延データのテーブルを作成します。テーブルにはパーティションが含まれます。
DROP TABLE flight_delays_orc;
CREATE EXTERNAL TABLE flight_delays_orc (
yr INT,
quarter INT,
month INT,
dayofmonth INT,
dayofweek INT,
flightdate STRING,
uniquecarrier STRING,
airlineid INT,
carrier STRING,
tailnum STRING,
flightnum STRING,
originairportid INT,
originairportseqid INT,
origincitymarketid INT,
origin STRING,
origincityname STRING,
originstate STRING,
originstatefips STRING,
originstatename STRING,
originwac INT,
destairportid INT,
destairportseqid INT,
destcitymarketid INT,
dest STRING,
destcityname STRING,
deststate STRING,
deststatefips STRING,
deststatename STRING,
destwac INT,
crsdeptime STRING,
deptime STRING,
depdelay INT,
depdelayminutes INT,
depdel15 INT,
departuredelaygroups INT,
deptimeblk STRING,
taxiout INT,
wheelsoff STRING,
wheelson STRING,
taxiin INT,
crsarrtime INT,
arrtime STRING,
arrdelay INT,
arrdelayminutes INT,
arrdel15 INT,
arrivaldelaygroups INT,
arrtimeblk STRING,
cancelled INT,
cancellationcode STRING,
diverted INT,
crselapsedtime INT,
actualelapsedtime INT,
airtime INT,
flights INT,
distance INT,
distancegroup INT,
carrierdelay INT,
weatherdelay INT,
nasdelay INT,
securitydelay INT,
lateaircraftdelay INT,
firstdeptime STRING,
totaladdgtime INT,
longestaddgtime INT,
divairportlandings INT,
divreacheddest INT,
divactualelapsedtime INT,
divarrdelay INT,
divdistance INT,
div1airport STRING,
div1airportid INT,
div1airportseqid INT,
div1wheelson STRING,
div1totalgtime INT,
div1longestgtime INT,
div1wheelsoff STRING,
div1tailnum STRING,
div2airport STRING,
div2airportid INT,
div2airportseqid INT,
div2wheelson STRING,
div2totalgtime INT,
div2longestgtime INT,
div2wheelsoff STRING,
div2tailnum STRING,
div3airport STRING,
div3airportid INT,
div3airportseqid INT,
div3wheelson STRING,
div3totalgtime INT,
div3longestgtime INT,
div3wheelsoff STRING,
div3tailnum STRING,
div4airport STRING,
div4airportid INT,
div4airportseqid INT,
div4wheelson STRING,
div4totalgtime INT,
div4longestgtime INT,
div4wheelsoff STRING,
div4tailnum STRING,
div5airport STRING,
div5airportid INT,
div5airportseqid INT,
div5wheelson STRING,
div5totalgtime INT,
div5longestgtime INT,
div5wheelsoff STRING,
div5tailnum STRING
)
PARTITIONED BY (year String)
STORED AS ORC
LOCATION 's3://athena-examples-myregion/flight/orc/'
tblproperties ("orc.compress"="ZLIB");テーブルに対して MSCK REPAIR TABLE ステートメントを実行し、パーティションのメタデータを更新します。
MSCK REPAIR TABLE flight_delays_orc;次のクエリでは、遅延が 1 時間を超えた上位 10 便を取得します。
SELECT origin, dest, count(*) as delays
FROM flight_delays_orc
WHERE depdelayminutes > 60
GROUP BY origin, dest
ORDER BY 3 DESC
LIMIT 10;