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How can I log something in USQL UDO?


By : samej
Date : October 17 2020, 01:08 AM
I wish did fix the issue. A recent release of U-SQL has added diagnostic logging for UDOs. See the release notes here.
code :
// Enable the diagnostics preview feature
SET @@FeaturePreviews = "DIAGNOSTICS:ON";


// Extract as one column
@input =
    EXTRACT col string
    FROM "/input/input42.txt"
    USING new Utilities.MyExtractor();


@output =
    SELECT *
    FROM @input;


// Output the file
OUTPUT @output
TO "/output/output.txt"
USING Outputters.Tsv(quoting : false);
using System.Collections.Generic;
using System.IO;
using System.Text;
using Microsoft.Analytics.Interfaces;

namespace Utilities
{
    [SqlUserDefinedExtractor(AtomicFileProcessing = true)]
    public class MyExtractor : IExtractor
    {
        //Contains the row
        private readonly Encoding _encoding;
        private readonly byte[] _row_delim;
        private readonly char _col_delim;

        public MyExtractor()
        {
            _encoding = Encoding.UTF8;
            _row_delim = _encoding.GetBytes("\n\n");
            _col_delim = '|';
        }

        public override IEnumerable<IRow> Extract(IUnstructuredReader input, IUpdatableRow output)
        {
            string s = string.Empty;
            string x = string.Empty;
            int i = 0;

            foreach (var current in input.Split(_row_delim))
            {
                using (System.IO.StreamReader streamReader = new StreamReader(current, this._encoding))
                {
                    while ((s = streamReader.ReadLine()) != null)
                    {
                        //Strip any line feeds
                        //s = s.Replace("/n", "");

                        // Concatenate the lines
                        x += s;
                        i += 1;

                    }

                    Microsoft.Analytics.Diagnostics.DiagnosticStream.WriteLine(System.String.Format("Concatenations done: {0}", i));

                    //Create the output
                    output.Set<string>(0, x);
                    yield return output.AsReadOnly();

                    // Reset
                    x = string.Empty;

                }
            }
        }
    }
}


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USQL - How To Select All Rows Between Two String Rows in USQL


By : Gaurav
Date : March 29 2020, 07:55 AM
wish helps you I think this is possible using normal U-SQL without a custom extractor. I have created a simple example based on your sample data:
code :
// Get raw input
@input =
    EXTRACT rawData string
    FROM "/input/input36.txt"
    USING Extractors.Tsv();


// Add a row number and break out the section;
// Get all [START OF ...] and [END OF ...] blocks and pair them.
// !!WARNING code assumes there are no duplicate sections, ie can not be more than one DAILY ACCOUNT section for example
@working =
    SELECT ROW_NUMBER() OVER() AS rn,
           System.Text.RegularExpressions.Regex.Match(rawData, "(START OF|END OF) (?<sectionName>.+)").Groups["sectionName"].ToString() AS sectionName,
           *
    FROM @input;


// Work out the section boundaries
@sections =
    SELECT sectionName,
           MIN(rn) AS startRn,
           MAX(rn) AS endRn,
           COUNT( * ) AS records
    FROM @working
    WHERE sectionName != ""
    GROUP BY sectionName;


// Create the output
@output =
    SELECT s.sectionName,
           i.rn == s.startRn ? 1 : 0 AS isStartSection,
           i.rn == s.endRn ? 1 : 0 AS isEndSection,
           i.rawData
    FROM @sections AS s
         CROSS JOIN
             @working AS i
    WHERE i.rn BETWEEN s.startRn AND s.endRn;


// Output the file
OUTPUT @output
TO "/output/output.txt"
USING Outputters.Tsv(quoting : false);
@dailyAccount =
    SELECT rawData
    FROM @output
    WHERE sectionName == "DAILY ACCOUNT"
          AND isStartSection == 0
          AND isEndSection == 0;

How to use subquery in USQL?


By : Augusto Rolon
Date : March 29 2020, 07:55 AM
Does that help In U-SQL NOT EXISTS is implemented as ANTISEMIJOIN, something like this:
code :
@CourseDataExcludingUpdatedCourse =
    SELECT cd.*
    FROM @CourseData AS cd
         ANTISEMIJOIN
             @UpdatedCourseData AS us
         ON cd.courseId == us.courseId;

Can't we upload documents/Image using USQL Custom Code and usql?


By : Jus wantoro
Date : March 29 2020, 07:55 AM
it helps some times I am a bit puzzled in what you are trying to achieve. Are you trying to call the Azure SDK calls from within a U-SQL User-defined operator? That will not work since the U-SQL containers do not allows calling web services APIs, including the data lake REST APIs.

passing dynamic parameter to USQL script using data factory v2 USQL activity


By : keshav gaur
Date : March 29 2020, 07:55 AM
wish help you to fix your issue When passing in parameters from ADF to a U-SQL script, you should declare a default value for the parameter in your script using DECLARE EXTERNAL. ADF v2 passes in parameters to U-SQL by writing in DECLARE statements at the very top of your script. However, multiple DECLARE statements for the same variable cause a compilation error - but having a DECLARE EXTERNAL and DECLARE statement won't cause an error, because DECLARE EXTERNAL's use case is to be overwritten by the DECLARE statement above it (for this very use case).
U-SQL requires that a variable has a value when it is defined, which is your Scenario 2 error.

Slow execution of USQL


By : GHOST
Date : March 29 2020, 07:55 AM
To fix the issue you can do I assume you are using the file set syntax to specify the 1000 files? Unfortunately the current default implementation of file sets is not scaling well and the compilation (preparation) phase is going to take a long time (as does the execution). We currently have a better implementation in preview. Can you please send me a mail to usql at Microsoft dot com and I will tell you how you can try out the preview implementation.
Michael
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