MAXLEN is not applicable for %GlobalCharacterStream (Blob). You will get compilation error #5480

I noticed that you are using the {Stream} syntax, which is typical for trigger code or calculated field.
Could you check the following code at your place:

Class dc.test Extends %Persistent
{

Property stream As %GlobalCharacterStream;

Trigger NewTrigger1 [ Event = INSERT ]
{
 i $IsObject({stream}) {
   s t={stream}
   s ^||tmp=t.Size
 }
}

ClassMethod Test()
{
  d ..%KillExtent(,$$$YES)
  
  s f=##class(%Stream.FileBinary).%New()
  d f.LinkToFile("C:\test.jpg")
  
  &sql(insert into dc.test(stream) values(:f))
  i 'SQLCODE {
    &sql(select CHAR_LENGTH(stream) into :len from dc.test where %id=1)
    w len," ",^||tmp,!
  }
}

}

I have saved a 16 MB file without any problems:

USER>d ##class(dc.test).Test()
16446809 16446809

String Length Limit

USER>w $system.SYS.MaxLocalLength()
3641144

The resulting archive is easily recognized/unpacked in WinRAR, 7z:

s f=##class(%Stream.FileCharacterGzip).%New()
s f.TranslateTable="UTF8"
s f.Filename="C:\test.gz"
d f.WriteLine("test")
d f.Write("Привет Caché")
d f.%Save()

I think it will also be useful to mention here the links to the documentation:

• Optimizing SQL^IRIS (Best Practices for Improving SQL Performance, Configure SQL Performance Options, etc.)
• Performance and Programming Considerations^Caché (for ECP)
• Performance tips for Business Intelligence^IRIS (DeepSee)
• Performance&Security Tips and Information^IRIS (for Persistent Classes)

I would like to supplement the above with such parameters as STORAGEDEFAULT, SQLTABLENAME, and SQLPROJECTION: Storage and SQL Projection of Collection Properties

However a collection property is actually stored, the property can be projected as a column in the parent table, as a child table, or in both ways (as of release 2022.1, this is true for both list and array properties). To control this, you specify the SQLPROJECTION parameter of the property.

Thanks for the hint, I fixed it.
By the way, your code can be reduced to 173:  f i=$i(r):1:a

There is no limit to perfection.

By the way, your code shows 175 characters, where did the number 174 come from?

Ah, got it.

I improved my score to 179 (see above).

Have you used a test case?

Have you used a test case?

Try this:

ClassMethod test2()
{
  set tKP = ..%New()
  set tIdentifierSerial = ##class(HS.Message.AddUpdateHubRequest).%OpenId(21986071).Identifiers
  zw tIdentifierSerial
  set tKP.IsSerial = 1
  set tKP.IsList = 1
  set tSerial = tIdentifierSerial.GetObjectNext(.tKey)
  for {
    if tKey="" {quit}
    do tKP.SerialList.InsertObject(tSerial)
    set tSerial = tIdentifierSerial.GetObjectNext(.tKey)
  }
  w tKP.%Save()
}

As far as I understand, the author wants to calculate the value of a field based on some list of fields whose names he takes from some table. Right?

Try inserting an apostrophe through concatenation, something like

INSERT INTO MyText
    (text)
VALUES
    ('I visited O' || CHAR(39) || 'Brien before heading out of town.')

I'm getting an error:

ERROR #9406: Unexpected format for value of field, searchCriteria, using class base mapping

After fixing the JSON, the error disappeared:

{"searchCriteria": {..}} ==> {"searchCriteria": [{..}]}

Also note the mapping between the fields professionalId/professionalNif and preparation/actPreparation

Your code does not take into account the numbers, so an incorrect result is given for "L33T C0d3r".