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t = db.index_check7
t.drop()
for ( var i=0; i<100; i++ )
t.save( { x : i } )
t.ensureIndex( { x : 1 } )
assert.eq( 1 , t.find( { x : 27 } ).explain(true).executionStats.totalKeysExamined , "A" )
t.ensureIndex( { x : -1 } )
assert.eq( 1 , t.find( { x : 27 } ).explain(true).executionStats.totalKeysExamined , "B" )
assert.eq( 40 , t.find( { x : { $gt : 59 } } ).explain(true)
.executionStats.totalKeysExamined , "C" );
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