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// Use of an $atomic match expression does not affect choice of index. SERVER-5354
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t = db.jstests_queryoptimizerc;
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function checkExplainResults( explain ) {
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assert.eq( 'BtreeCursor a_1', explain.cursor ); // a:1 index chosen.
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assert.eq( 1, explain.allPlans.length ); // Only one (optimal) plan is attempted.
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t.ensureIndex( { a:1 } );
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checkExplainResults( t.find( { a:1 } ).explain( true ) );
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checkExplainResults( t.find( { a:1, $atomic:1 } ).explain( true ) );