How to avoid unnecessary join

[shekhar0413]

Hi, I have an explore in which I join a view, say view1 to another view, say view2 like so:

explore: view1{

  join : view2{
    type: inner
    relationship: many_to_many
    sql_on: ${view1.id} = ${view2.id} ;;
  }
}

Now, when I am in Explore, both view1 and view2 are visible to explore. If I select dimensions and measures only from view1, then the sql generated has no joins which is what I expected. But, if I select dimensions and measures only from view2, the sql generated has a join. I was expecting that since no measure and dimension has been selected from view1 there would have been no join in the resulting sql. Why is a join required when nothing from view1 has been selected, is there a reason looker does this? And are there ways I can define the lookMl to avoid this join?

Thanks for the inputs