Define schema of file, must map all columns @searchlog = EXTRACT UserId int, Start DateTime, Region string, Query string, ...

//Define schema of file, must map all columns
@searchlog = 
    EXTRACT UserId          int, 
            Start           DateTime, 
            Region          string, 
            Query           string, 
            Duration        int, 
            Urls            string, 
            ClickedUrls     string
    FROM @"/Samples/Data/SearchLog.tsv"
    USING Extractors.Tsv();

OUTPUT @searchlog 
    TO @"/Samples/Output/SearchLog_output.tsv"
    USING Outputters.Tsv();
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