jstests/core/or_always_false.js


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// Tests that a rooted-$or query with each clause provably false will not return any results.
(function() {
    "use strict";

    const coll = db.or_always_false;
    coll.drop();

    assert.writeOK(coll.insert([{}, {}, {}]));
    const emptyOrError = assert.throws(() => coll.find({$or: []}).itcount());
    assert.eq(emptyOrError.code, ErrorCodes.BadValue);

    assert.eq(coll.find({$or: [{$alwaysFalse: 1}]}).itcount(), 0);
    assert.eq(coll.find({$or: [{a: {$all: []}}]}).itcount(), 0);
    assert.eq(coll.find({$or: [{$alwaysFalse: 1}, {$alwaysFalse: 1}]}).itcount(), 0);
    assert.eq(coll.find({$or: [{$alwaysFalse: 1}, {a: {$all: []}}, {$alwaysFalse: 1}]}).itcount(),
              0);
}());