Right now if $inc would cause two positive ints to overflow, the result is converted to a long to prevent overflow. However, if two negative ints are added the result may overflow to a negative int.
Test
c = db.c;
c.drop();
c.save( { a:NumberInt( 0x7fffffff ) } );
c.update( {}, { $inc:{ a:NumberInt( 10000 ) } } );
// The sum of two positive ints is converted to a positive long on overflow.
printjson( c.find().toArray() );
c.drop();
c.save( { a:NumberInt( 0xffffffff ) } );
c.update( {}, { $inc:{ a:NumberInt( -10000 ) } } );
// The sum of two negative ints overflows to a positive int.
printjson( c.find().toArray() );
- related to
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SERVER-6399 Refactor update() code
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- Closed
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