File: in.js

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mongodb 1%3A2.4.10-5
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t = db.in1;
t.drop();

t.save( { a : 1 } );
t.save( { a : 2 } );

assert.eq( 1 , t.find( { a : { $in : [ 1 ] } } ).itcount() , "A" );
assert.eq( 1 , t.find( { a : { $in : [ 2 ] } } ).itcount() , "B" );
assert.eq( 2 , t.find( { a : { $in : [ 1 , 2 ] } } ).itcount() , "C" );

t.ensureIndex( { a : 1 } );

assert.eq( 1 , t.find( { a : { $in : [ 1 ] } } ).itcount(), "D" );
assert.eq( 1 , t.find( { a : { $in : [ 2 ] } } ).itcount() , "E" );
assert.eq( 2 , t.find( { a : { $in : [ 1 , 2 ] } } ).itcount() , "F" );

assert.eq( 0 , t.find( { a : { $in : [] } } ).itcount() , "G" );

assert.eq( 1 , t.find( { a : { $gt: 1, $in : [ 2 ] } } ).itcount() , "E" );