mirror of https://github.com/mongodb/mongo
33 lines
1.5 KiB
JavaScript
33 lines
1.5 KiB
JavaScript
// This test was written to reproduce SERVER-44258 and prove that a band-aid approach is having the
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// desired effect. It should be ported to a unit test once SERVER-44258 is tackled more
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// holistically.
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//
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// TODO SERVER-44258 delete this test and replace it with a unit test.
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//
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// @tags: [
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// # Tests the 'stages' field of the explain output which is hidden beneath each shard's name when
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// # run against sharded collections.
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// assumes_unsharded_collection,
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// # Tests the explain output, so does not work when wrapped in a facet.
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// do_not_wrap_aggregations_in_facets,
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// # Explicitly testing optimization.
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// requires_pipeline_optimization,
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// ]
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const coll = db.double_optimize;
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coll.drop();
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assert.commandWorked(coll.insert([{_id: 0}, {_id: 1}, {_id: 2}, {_id: 3}, {_id: 4}]));
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// Test that this $match can be split in two and partially swapped before the $addFields stage. We
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// expect optimization to examine the $or and observe that the {_id: 4} portion of the predicate is
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// independent of the "trap" field and can be evaluated before the "trap" computation.
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//
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// If the optimizer fails to move the {_id: 4} filter to the front of the pipeline, the $addFields
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// stage will evaluate sqrt(_id - 4) on every document, resulting in a fatal error when (_id - 4) is
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// negative.
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const inputPipe = [
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{$addFields: {trap: {$sqrt: {$subtract: ["$_id", 4]}}}},
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{$match: {$or: [{_id: 4, trap: {$ne: 0}}]}}
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];
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const result = coll.aggregate(inputPipe).toArray();
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assert.sameMembers([], result);
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