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/*
* SERVER-6147 : aggregation $ne expression applied to constant returns incorrect result.
*
* This test validates the SERVER-6147 ticket. Return true when comparing a constant to a field
* containing a different value using $ne. Previously it would return false when comparing a
* constant and a field regardless of whether they were equal or not.
*/
(function() {
"use strict";
db.s6147.drop();
assert.commandWorked(db.s6147.insert({a: 1}));
assert.commandWorked(db.s6147.insert({a: 2}));
// Aggregate checking various combinations of the constant and the field.
const cursor = db.s6147.aggregate([
{$sort: {a: 1}},
{
$project: {
_id: 0,
constantAndField: {$ne: [1, "$a"]},
fieldAndConstant: {$ne: ["$a", 1]},
constantAndConstant: {$ne: [1, 1]},
fieldAndField: {$ne: ["$a", "$a"]}
}
}
]);
// In both documents, the constantAndConstant and fieldAndField should be false since they
// compare something with itself. However, the constantAndField and fieldAndConstant should be
// different as document one contains 1 which should return false and document 2 contains
// something different so should return true.
const expected = [
{
constantAndField: false,
fieldAndConstant: false,
constantAndConstant: false,
fieldAndField: false
},
{
constantAndField: true,
fieldAndConstant: true,
constantAndConstant: false,
fieldAndField: false
}
];
assert.eq(cursor.toArray(), expected);
}());
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