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    select => [
        'A.foo',
        'E.bar',
    ],

    select => [
        'A.foo',                                  #normal
        { 'A.foo' => 'the_foo' },                 #simple
        { 'E.bar' => { alias => 'the_e_bar' } },  #flexible
    ],

SELECT A.foo, A.foo the_foo, E.bar the_e_bar