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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.
*/
/*
* 1) Clear and create testing db
* 2) Run an aggregation with $ne comparing constants and fields in various configurations
* 3) Assert that the result is what we expected
*/
// Clear db
db.s6147.drop();
// Populate db
db.s6147.save({a: 1});
db.s6147.save({a: 2});
// Aggregate checking various combinations of the constant and the field
var s6147 = db.s6147.aggregate({
$project: {
_id: 0,
constantAndField: {$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 but 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
*/
var s6147result = [
{
constantAndField: false,
fieldAndConstant: false,
constantAndConstant: false,
fieldAndField: false
},
{
constantAndField: true,
fieldAndConstant: true,
constantAndConstant: false,
fieldAndField: false
}
];
// Assert
assert.eq(s6147.toArray(), s6147result, 's6147 failed');
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