What do you mean? Your virtual field is inserting 'mmm' into the log table. 
When you call "select" the virtual field is called for each row by the 
default processor which creates the Rows object.  

You can see the default processing rows from the DB get here:
https://github.com/web2py/pydal/blob/master/pydal/adapters/base.py#L298

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