How to update an entity with an element-collection of type Map<String,String>?

        user.PictureUri = null;
        tableServiceContext.AttachTo(TableNames.User, user);
        tableServiceContext.Update(user);
        tableServiceContext.SaveChanges(SaveChangesOption.ReplaceOnUpdate);
        tableServiceContext.Detach(user);

insert into new_table
select * from old_table

db.SurName.aggregate([
  {$addFields:{
    NUMBER : {$toInt:"$NUMBER"}
  }},
  {$out: "SurName2"}
])

db.SurName.drop()
db.SurName2.renameCollection("SurName")

public function getFile(): ?string
{
    return $this->file;
}

public function setFile(string $file): self
{
    $this->file = $file;

    return $this;
}

public function getFile()
{
    return $this->file;
}

public function setFile($file): self
{
    $this->file = $file;

    return $this;
}