76 lines
2.6 KiB
JavaScript
76 lines
2.6 KiB
JavaScript
// test short-circuiting of $and and $or in
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// $project stages to a $const boolean
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//
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// Cannot implicitly shard accessed collections because the explain output from a mongod when run
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// against a sharded collection is wrapped in a "shards" object with keys for each shard.
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//
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// This test makes assumptions about how the explain output will be formatted, so cannot be
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// transformed to be put inside a $facet stage or when pipeline optimization is disabled.
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// @tags: [
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// assumes_unsharded_collection,
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// do_not_wrap_aggregations_in_facets,
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// requires_pipeline_optimization,
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// ]
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(function() {
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"use strict";
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load("jstests/libs/analyze_plan.js"); // For 'getPlanStage'.
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const t = db.jstests_aggregation_server6192;
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t.drop();
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assert.commandWorked(t.insert({x: true}));
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function optimize(expression) {
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const explained = t.explain().aggregate([
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// This inhibit optimization prevents the expression being pushed down into the .find()
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// layer, to make assertions simpler. But it doesn't prevent the $project stage itself
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// from being optimized.
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{$_internalInhibitOptimization: {}},
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{$project: {result: expression}},
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]);
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const stage = getAggPlanStage(explained, "$project");
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assert(stage, explained);
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assert(stage.$project.result, explained);
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return stage.$project.result;
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}
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function assertOptimized(expression, value) {
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const optimized = optimize(expression);
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assert.docEq({$const: value}, optimized, "ensure short-circuiting worked");
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}
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function assertNotOptimized(expression) {
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const optimized = optimize(expression);
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// 'optimized' may be simpler than 'expression', but we assert it did not optimize to a
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// constant.
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assert.neq(Object.keys(optimized), ['$const'], "ensure no short-circuiting", optimized);
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}
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// short-circuiting for $and
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assertOptimized({$and: [0, '$x']}, false);
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assertOptimized({$and: [0, 1, '$x']}, false);
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assertOptimized({$and: [0, 1, '', '$x']}, false);
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assertOptimized({$and: [1, 0, '$x']}, false);
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assertOptimized({$and: [1, '', 0, '$x']}, false);
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assertOptimized({$and: [1, 1, 0, 1]}, false);
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// short-circuiting for $or
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assertOptimized({$or: [1, '$x']}, true);
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assertOptimized({$or: [1, 0, '$x']}, true);
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assertOptimized({$or: [1, '', '$x']}, true);
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assertOptimized({$or: [0, 1, '$x']}, true);
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assertOptimized({$or: ['', 0, 1, '$x']}, true);
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assertOptimized({$or: [0, 0, 0, 1]}, true);
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// examples that should not short-circuit
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assertNotOptimized({$and: [1, '$x']});
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assertNotOptimized({$or: [0, '$x']});
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assertNotOptimized({$and: ['$x', '$x']});
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assertNotOptimized({$or: ['$x', '$x']});
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assertNotOptimized({$and: ['$x']});
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assertNotOptimized({$or: ['$x']});
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}());
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