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Type:
Improvement
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Labels:None
Observed behavior: The presence of a string in a $and/$or expression prevents optimization.
Expected behavior: Optimizations will be applied in spite of the string expressions.
/*
If there are any strings, we can't re-arrange anything, so stop
now.
LATER: we could concatenate adjacent strings as a special case.
*/
if (stringCount)
return intrusive_ptr<Expression>(this);
Test:
c = db.c;
c.drop();
c.save( { x:true } );
// Optimized to 'false'.
printjson( c.runCommand( 'aggregate', { pipeline:[ { $project:{ a:{ $and:[ 0, 1, '$x' ] \
} } } ], explain:true } ) );
// Not optimized.
printjson( c.runCommand( 'aggregate', { pipeline:[ { $project:{ a:{ $and:[ 0, 1, '', '$x\
' ] } } } ], explain:true } ) );
- related to
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- Closed
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