Create Hive Table with different schema data

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This topic contains 0 replies, has 1 voice, and was last updated by  Varun Gupta 1 year, 3 months ago.

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  • #52152

    Varun Gupta
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    I need to create Hive table on multiple CSV files were schema header of a CSV file may vary. For example

    File – csv1
    Header
    A, B, C

    File – csv2
    Header
    A, B, C, D

    File – csv3
    Header
    A, B, D, C

    Above, we see are three csv files with little varying schema header. I need to create a Hive table on these three csv files. One solution, I came up with is that I can create three individual hive tables (one for each csv file) and then create view on these hive tables.

    CREATE VIEW view (SELECT A,B,C,NULL from t1 UNION ALL SELECT A,B,C,D from t2 UNION ALL SELECT A,B,C,D from t3);

    This solution works fine with me, but is there a more efficient solution?

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