Video: Dab tsi yog cov ntaub ntawv nyuaj hauv npua?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Hom complex . Npua muaj peb hom ntaub ntawv complex : maps, tuples, and bag. Tag nrho cov no hom tuaj yeem muaj cov ntaub ntawv ntawm tej hom , suav nrog lwm yam hom complex . Yog li ntawd nws yog ib qhov ua tau kom muaj ib daim ntawv qhia uas tus nqi teb yog ib lub hnab, uas muaj ib tug tuple qhov twg ib tug ntawm cov teb yog ib daim ntawv qhia.
Ntawm no, dab tsi yog lub neej ntawd cov ntaub ntawv hom teb hauv npua?
bytearray: Siv los sawv cev bytes. Nws yog tus hom ntaub ntawv default . Yog koj tsis qhia a hom ntaub ntawv rau ib daim ntawv, ces bytearray hom ntaub ntawv yog muab rau lub teb.
Ib sab saum toj no, dab tsi yog kev sib raug zoo hauv npua? A Pig txheeb yog ib lub hnab tuples. A Pig txheeb zoo ib yam li ib lub rooj nyob rau hauv ib tug relational database, qhov twg cov tuples nyob rau hauv lub hnab sib haum mus rau kab nyob rau hauv ib lub rooj.
Hais txog qhov no, dab tsi yog flatten nyob rau hauv npua?
Cov FLATTEN tus neeg teb xov tooj uas yog tus neeg ua lej lej zoo li UDF syntactically, tab sis nws yog tus neeg teb xov tooj uas hloov cov qauv ntawm tuples thiab hnab hauv txoj kev uas UDF tsis tuaj yeem. Flatten un-zes tuples thiab hnab. Rau tuples, tiaj tus hloov cov teb ntawm ib tug tuple nyob rau hauv qhov chaw ntawm lub tuple.
npua Big Data yog dab tsi?
PIG Hadoop Npua yog qib siab cov ntaub ntawv flow system uas ua rau koj ib hom lus yooj yim platform nrov npe hu ua Npua Latin uas tuaj yeem siv rau kev tswj hwm cov ntaub ntawv thiab cov lus nug. Npua yog siv los ntawm Microsoft, Yahoo thiab Google, los sau thiab khaws cia cov ntaub ntawv loj teev nyob rau hauv daim ntawv ntawm web crawls, nyem kwj thiab tshawb cav.
Pom zoo:
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