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// test short-circuiting of $and and $or in
// $project stages to a $const boolean
//
// Cannot implicitly shard accessed collections because the explain output from a mongod when run
// against a sharded collection is wrapped in a "shards" object with keys for each shard.
//
// This test makes assumptions about how the explain output will be formatted, so cannot be
// transformed to be put inside a $facet stage or when pipeline optimization is disabled.
// @tags: [
// assumes_unsharded_collection,
// do_not_wrap_aggregations_in_facets,
// requires_pipeline_optimization,
// ]
(function() {
"use strict";
load("jstests/libs/analyze_plan.js"); // For 'getPlanStage'.
const t = db.jstests_aggregation_server6192;
t.drop();
assert.commandWorked(t.insert({x: true}));
function assertOptimized(pipeline, v) {
const explained = t.runCommand("aggregate", {pipeline: pipeline, explain: true});
const projectStage = getPlanStage(explained, "PROJECTION_DEFAULT");
assert.eq(projectStage.transformBy.a["$const"], v, "ensure short-circuiting worked", explained);
}
function assertNotOptimized(pipeline) {
const explained = t.runCommand("aggregate", {pipeline: pipeline, explain: true});
const projectStage = getPlanStage(explained, "PROJECTION_DEFAULT");
assert(!("$const" in projectStage.transformBy.a), "ensure no short-circuiting");
}
// short-circuiting for $and
assertOptimized([{$project: {a: {$and: [0, '$x']}}}], false);
assertOptimized([{$project: {a: {$and: [0, 1, '$x']}}}], false);
assertOptimized([{$project: {a: {$and: [0, 1, '', '$x']}}}], false);
assertOptimized([{$project: {a: {$and: [1, 0, '$x']}}}], false);
assertOptimized([{$project: {a: {$and: [1, '', 0, '$x']}}}], false);
assertOptimized([{$project: {a: {$and: [1, 1, 0, 1]}}}], false);
// short-circuiting for $or
assertOptimized([{$project: {a: {$or: [1, '$x']}}}], true);
assertOptimized([{$project: {a: {$or: [1, 0, '$x']}}}], true);
assertOptimized([{$project: {a: {$or: [1, '', '$x']}}}], true);
assertOptimized([{$project: {a: {$or: [0, 1, '$x']}}}], true);
assertOptimized([{$project: {a: {$or: ['', 0, 1, '$x']}}}], true);
assertOptimized([{$project: {a: {$or: [0, 0, 0, 1]}}}], true);
// examples that should not short-circuit
assertNotOptimized([{$project: {a: {$and: [1, '$x']}}}]);
assertNotOptimized([{$project: {a: {$or: [0, '$x']}}}]);
assertNotOptimized([{$project: {a: {$and: ['$x', '$x']}}}]);
assertNotOptimized([{$project: {a: {$or: ['$x', '$x']}}}]);
assertNotOptimized([{$project: {a: {$and: ['$x']}}}]);
assertNotOptimized([{$project: {a: {$or: ['$x']}}}]);
}());
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