55 lines
2.1 KiB
JavaScript
55 lines
2.1 KiB
JavaScript
// test short-circuiting of $and and $or in
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// $project stages to a $const boolean
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var t = db.jstests_aggregation_server6192;
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t.drop();
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t.save({x: true});
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function assertOptimized(pipeline, v) {
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var explained = t.runCommand("aggregate", {pipeline: pipeline, explain: true});
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printjson({input: pipeline, output: explained});
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assert("stages" in explained);
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assert("$project" in explained.stages[1]);
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var projectStage = explained.stages[1]["$project"];
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assert.eq(projectStage.a["$const"], v, "ensure short-circuiting worked");
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}
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function assertNotOptimized(pipeline) {
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var explained = t.runCommand("aggregate", {pipeline: pipeline, explain: true});
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printjson({input: pipeline, output: explained});
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assert("stages" in explained);
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assert("$project" in explained.stages[1]);
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var projectStage = explained.stages[1]["$project"];
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assert(!("$const" in projectStage.a), "ensure no short-circuiting");
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}
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// short-circuiting for $and
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assertOptimized([{$project: {a: {$and: [0, '$x']}}}], false);
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assertOptimized([{$project: {a: {$and: [0, 1, '$x']}}}], false);
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assertOptimized([{$project: {a: {$and: [0, 1, '', '$x']}}}], false);
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assertOptimized([{$project: {a: {$and: [1, 0, '$x']}}}], false);
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assertOptimized([{$project: {a: {$and: [1, '', 0, '$x']}}}], false);
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assertOptimized([{$project: {a: {$and: [1, 1, 0, 1]}}}], false);
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// short-circuiting for $or
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assertOptimized([{$project: {a: {$or: [1, '$x']}}}], true);
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assertOptimized([{$project: {a: {$or: [1, 0, '$x']}}}], true);
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assertOptimized([{$project: {a: {$or: [1, '', '$x']}}}], true);
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assertOptimized([{$project: {a: {$or: [0, 1, '$x']}}}], true);
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assertOptimized([{$project: {a: {$or: ['', 0, 1, '$x']}}}], true);
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assertOptimized([{$project: {a: {$or: [0, 0, 0, 1]}}}], true);
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// examples that should not short-circuit
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assertNotOptimized([{$project: {a: {$and: [1, '$x']}}}]);
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assertNotOptimized([{$project: {a: {$or: [0, '$x']}}}]);
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assertNotOptimized([{$project: {a: {$and: ['$x', '$x']}}}]);
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assertNotOptimized([{$project: {a: {$or: ['$x', '$x']}}}]);
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assertNotOptimized([{$project: {a: {$and: ['$x']}}}]);
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assertNotOptimized([{$project: {a: {$or: ['$x']}}}]);
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