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/**
* Test that $locf works as a window function.
* @tags: [
* # Needed as $fill and $locf are 5.2 features.
* requires_fcv_52,
* ]
*/
(function() {
"use strict";
load("jstests/aggregation/extras/window_function_helpers.js");
load("jstests/aggregation/extras/utils.js"); // For arrayEq.
load("jstests/libs/feature_flag_util.js"); // For isEnabled.
const coll = db[jsTestName()];
coll.drop();
// Test that $locf doesn't parse with a window.
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{
$setWindowFields: {
sortBy: {_id: 1},
output: {val: {$locf: {}, window: []}},
}
}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// Create some documents.
let collection = [
{_id: 0, val: null},
{_id: 1, val: 0},
{_id: 2, val: 2},
{_id: 3, val: null},
{_id: 4},
{_id: 5, val: "str"},
{_id: 6, val: null},
{_id: 7, rand: "rand"},
];
assert.commandWorked(coll.insert(collection));
let result = coll.aggregate([{
$setWindowFields: {
sortBy: {_id: 1},
output: {val: {$locf: "$val"}},
}
}])
.toArray();
let expected = [
{_id: 0, val: null},
{_id: 1, val: 0},
{_id: 2, val: 2},
{_id: 3, val: 2},
{_id: 4, val: 2},
{_id: 5, val: "str"},
{_id: 6, val: "str"},
{_id: 7, rand: "rand", val: "str"},
];
assertArrayEq({actual: result, expected: expected});
// Test projecting to a different field.
result = coll.aggregate([{
$setWindowFields: {
sortBy: {_id: 1},
output: {newVal: {$locf: "$val"}},
}
}])
.toArray();
expected = [
{_id: 0, val: null},
{_id: 1, val: 0, newVal: 0},
{_id: 2, val: 2, newVal: 2},
{_id: 3, val: null, newVal: 2},
{_id: 4, newVal: 2},
{_id: 5, val: "str", newVal: "str"},
{_id: 6, val: null, newVal: "str"},
{_id: 7, rand: "rand", newVal: "str"},
];
assertArrayEq({actual: result, expected: expected});
// Partitions don't mix values
collection = [
{_id: 1, val: 0, part: 1},
{_id: 2, val: 2, part: 2},
{_id: 3, val: null, part: 1},
{_id: 4, val: null, part: 2},
];
coll.drop();
assert.commandWorked(coll.insert(collection));
result = coll.aggregate([{
$setWindowFields: {
sortBy: {_id: 1},
output: {val: {$locf: "$val"}},
partitionBy: "$part",
}
}])
.toArray();
expected = [
{_id: 1, val: 0, part: 1},
{_id: 2, val: 2, part: 2},
{_id: 3, val: 0, part: 1},
{_id: 4, val: 2, part: 2},
];
assertArrayEq({actual: result, expected: expected});
// Values stay missing if all values are missing.
collection = [
{_id: 1},
{_id: 2},
{_id: 3, val: null},
{_id: 4, val: null},
];
coll.drop();
assert.commandWorked(coll.insert(collection));
expected = collection;
result = coll.aggregate([{
$setWindowFields: {
sortBy: {_id: 1},
output: {val: {$locf: "$val"}},
}
}])
.toArray();
assertArrayEq({actual: result, expected: expected});
collection = [
{_id: 1, val: null},
{_id: 2},
{_id: 3, val: null},
{_id: 4},
];
coll.drop();
assert.commandWorked(coll.insert(collection));
expected = collection;
result = coll.aggregate([{
$setWindowFields: {
sortBy: {_id: 1},
output: {val: {$locf: "$val"}},
}
}])
.toArray();
assertArrayEq({actual: result, expected: expected});
})();
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