Hello, based on this Stackoverflow question/answer:

http://stackoverflow.com/questions/24825047/doctrine-custom-form-field-based-on-query

I would like to bring an ideia to the development team in using 

select exists(select * from associated_table where id_main_table = 
<whatever> limit 1)

in isEmpty() for EXTRA_LAZY associations. 

The current functionality is it would fetch the whole collection when 
called. 

Based on my tests the performace gain on using it over count() > 0 would be 
20x faster.

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