30 lines
918 B
JavaScript
30 lines
918 B
JavaScript
// Test "impossible match" queries, or queries that will always have
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// an empty result set.
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t = db.jstests_indexn;
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t.drop();
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t.save( {a:1,b:[1,2]} );
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t.ensureIndex( {a:1} );
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t.ensureIndex( {b:1} );
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// {a:1} is a single key index, so no matches are possible for this query
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assert.eq( 0, t.count( {a:{$gt:5,$lt:0}} ) );
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assert.eq( 0, t.count( {a:{$gt:5,$lt:0},b:2} ) );
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assert.eq( 0, t.count( {a:{$gt:5,$lt:0},b:{$gt:0,$lt:5}} ) );
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// One clause of an $or is an "impossible match"
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printjson( t.find( {$or:[{a:{$gt:5,$lt:0}},{a:1}]} ).explain() )
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assert.eq( 1, t.count( {$or:[{a:{$gt:5,$lt:0}},{a:1}]} ) );
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// One clause of an $or is an "impossible match"; original order of the $or
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// does not matter.
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printjson( t.find( {$or:[{a:1},{a:{$gt:5,$lt:0}}]} ).explain() )
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assert.eq( 1, t.count( {$or:[{a:1},{a:{$gt:5,$lt:0}}]} ) );
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t.save( {a:2} );
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assert.eq( 2, t.count( {$or:[{a:1},{a:{$gt:5,$lt:0}},{a:2}]} ) );
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