061a086641
The actual change is in src/mongo/shell/collection.js with the remaining changes
to adjust tests to the new api.
The "ideal" arguments are now an array of pipeline ops and an optional object
with extra top-level options for the command (such as {explain: true}. For
backwards compatibility, we still support the varargs style where each argument
is a pipeline stage, but there is no way to specify extra parameters in this
mode.
111 lines
3.0 KiB
JavaScript
111 lines
3.0 KiB
JavaScript
// Check $first/$last group accumulators. SERVER-3862
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// $first/$last select first/last value for a group key from the previous pipeline.
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t = db.jstests_aggregation_firstlast;
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t.drop();
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/** Check expected $first and $last result values. */
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function assertFirstLast( expectedFirst, expectedLast, pipeline, expression ) {
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pipeline = pipeline || [];
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expression = expression || '$b'
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pipeline.push( { $group:{ _id:'$a',
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first:{ $first:expression },
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last:{ $last:expression } } } );
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result = t.aggregate( pipeline ).toArray();
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for( var i = 0; i < result.length; ++i ) {
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if ( result[ i ]._id == 1 ) {
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// Check results for group _id 1.
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assert.eq( expectedFirst, result[ i ].first );
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assert.eq( expectedLast, result[ i ].last );
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return;
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}
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}
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assert( false, "Expected group _id '1' missing." );
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}
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// One document.
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t.save( { a:1, b:1 } );
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assertFirstLast( 1, 1 );
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// Two documents.
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t.save( { a:1, b:2 } );
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assertFirstLast( 1, 2 );
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// Three documents.
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t.save( { a:1, b:3 } );
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assertFirstLast( 1, 3 );
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// Another 'a' key value does not affect outcome.
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t.drop();
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t.save( { a:3, b:0 } );
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t.save( { a:1, b:1 } );
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t.save( { a:1, b:2 } );
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t.save( { a:1, b:3 } );
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t.save( { a:2, b:0 } );
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assertFirstLast( 1, 3 );
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// Additional pipeline stages do not affect outcome if order is maintained.
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assertFirstLast( 1, 3, [ { $project:{ x:'$a', y:'$b' } }, { $project:{ a:'$x', b:'$y' } } ] );
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// Additional pipeline stages affect outcome if order is modified.
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assertFirstLast( 3, 1, [ { $sort:{ b:-1 } } ] );
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// Skip and limit affect the results seen.
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t.drop();
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t.save( { a:1, b:1 } );
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t.save( { a:1, b:2 } );
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t.save( { a:1, b:3 } );
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assertFirstLast( 1, 2, [ { $limit:2 } ] );
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assertFirstLast( 2, 3, [ { $skip:1 }, { $limit:2 } ] );
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assertFirstLast( 2, 2, [ { $skip:1 }, { $limit:1 } ] );
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// Mixed type values.
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t.save( { a:1, b:'foo' } );
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assertFirstLast( 1, 'foo' );
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t.drop();
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t.save( { a:1, b:'bar' } );
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t.save( { a:1, b:true } );
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assertFirstLast( 'bar', true );
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// Value null.
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t.drop();
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t.save( { a:1, b:null } );
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t.save( { a:1, b:2 } );
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assertFirstLast( null, 2 );
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t.drop();
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t.save( { a:1, b:2 } );
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t.save( { a:1, b:null } );
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assertFirstLast( 2, null );
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t.drop();
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t.save( { a:1, b:null } );
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t.save( { a:1, b:null } );
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assertFirstLast( null, null );
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// Value missing.
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t.drop();
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t.save( { a:1 } );
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t.save( { a:1, b:2 } );
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assertFirstLast( undefined, 2 );
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t.drop();
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t.save( { a:1, b:2 } );
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t.save( { a:1 } );
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assertFirstLast( 2, undefined );
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t.drop();
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t.save( { a:1 } );
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t.save( { a:1 } );
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assertFirstLast( undefined, undefined );
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// Dotted field.
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t.drop();
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t.save( { a:1, b:[ { c:1 }, { c:2 } ] } );
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t.save( { a:1, b:[ { c:6 }, {} ] } );
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assertFirstLast( [ 1, 2 ], [ 6 ], [], '$b.c' );
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// Computed expressions.
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t.drop();
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t.save( { a:1, b:1 } );
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t.save( { a:1, b:2 } );
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assertFirstLast( 1, 0, [], { $mod:[ '$b', 2 ] } );
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assertFirstLast( 0, 1, [], { $mod:[ { $add:[ '$b', 1 ] }, 2 ] } );
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