53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
/**
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* Tests that modding the smallest representable integer values by -1 does not result in integer
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* overflow. Exercises the fix for SERVER-43699.
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* @tags: [
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* requires_getmore,
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* ]
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*/
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const testDB = db.getSiblingDB(jsTestName());
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const testColl = testDB.test;
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testColl.drop();
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// Insert two documents, one with a value of -2^63 and the other with a value of -2^31.
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const insertedDocs = [
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{_id: 0, val: NumberLong("-9223372036854775808")},
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{_id: 1, val: NumberInt("-2147483648")},
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];
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assert.commandWorked(testColl.insert(insertedDocs));
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// For each possible integral representation of -1, confirm that overflow does not occur.
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for (let divisor of [-1.0, NumberInt("-1"), NumberLong("-1"), NumberDecimal("-1")]) {
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assert.docEq(
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insertedDocs,
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testColl
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.find({val: {$mod: [divisor, 0]}})
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.sort({_id: 1})
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.toArray(),
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);
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assert.docEq(
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insertedDocs,
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testColl.aggregate([{$match: {$expr: {$eq: [0, {$mod: ["$val", divisor]}]}}}, {$sort: {_id: 1}}]).toArray(),
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);
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// Confirm that overflow does not occur during agg expression evaluation. Also confirm that the
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// correct type is returned for each combination of input types.
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const expectedResults = [
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Object.merge(insertedDocs[0], {
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modVal: divisor instanceof NumberDecimal ? NumberDecimal("-0") : NumberLong("0"),
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}),
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Object.merge(insertedDocs[1], {
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modVal:
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divisor instanceof NumberLong
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? NumberLong("0")
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: divisor instanceof NumberDecimal
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? NumberDecimal("-0")
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: 0,
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}),
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];
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assert.docEq(
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expectedResults,
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testColl.aggregate([{$project: {val: 1, modVal: {$mod: ["$val", divisor]}}}, {$sort: {_id: 1}}]).toArray(),
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);
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}
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