[SERVER-7445] $in operator should require an array - MongoDB Jira

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$in should take a list (array) of values. But it currently also accepts an object. An object should probably trigger a query parse error.

c = db.c;

c.drop();

c.save( { a:1 } );

c.save( { a:2 } );

c.save( { a:3 } );

// Works

printjson( c.find( { a:{ $in:[ 1, 3 ] } } ).toArray() );

// Works the same as the above line, but it should probably be uassert.

printjson( c.find( { a:{ $in:{ x:1, y:3 } } } ).toArray() );

is related to

SERVER-7391 Parse bson queries into new MatchExpression AST

related to

SERVER-6400 Refactor Matcher/QueryExpression