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/**
* Test the behavior of $integral.
*/
(function() {
"use strict";
load("jstests/aggregation/extras/window_function_helpers.js");
const getParam = db.adminCommand({getParameter: 1, featureFlagWindowFunctions: 1});
jsTestLog(getParam);
const featureEnabled = assert.commandWorked(getParam).featureFlagWindowFunctions.value;
if (!featureEnabled) {
jsTestLog("Skipping test because the window function feature flag is disabled");
return;
}
const coll = db.setWindowFields_integral;
// Like most other window functions, the default window for $integral is [unbounded, unbounded].
coll.drop();
assert.commandWorked(coll.insert([
{x: 0, y: 0},
{x: 1, y: 42},
{x: 3, y: 67},
{x: 7, y: 99},
{x: 10, y: 20},
]));
let result = coll.runCommand({
aggregate: coll.getName(),
cursor: {},
pipeline: [
{
$setWindowFields: {
sortBy: {x: 1},
output: {
integral: {$integral: {input: "$y"}},
}
}
},
]
});
assert.commandWorked(result);
// $integral never compares values from separate partitions.
coll.drop();
assert.commandWorked(coll.insert([
{partitionID: 1, x: 0, y: 1},
{partitionID: 1, x: 1, y: 2},
{partitionID: 1, x: 2, y: 1},
{partitionID: 1, x: 3, y: 4},
{partitionID: 2, x: 0, y: 100},
{partitionID: 2, x: 2, y: 105},
{partitionID: 2, x: 4, y: 107},
{partitionID: 2, x: 6, y: -100},
]));
result = coll.aggregate([
{
$setWindowFields: {
partitionBy: "$partitionID",
sortBy: {x: 1},
output: {
integral: {$integral: {input: "$y"}, window: {documents: [-1, 0]}},
}
}
},
{$unset: "_id"},
])
.toArray();
assert.sameMembers(result, [
{partitionID: 1, x: 0, y: 1, integral: 0},
{partitionID: 1, x: 1, y: 2, integral: 1.5}, // (1 + 2) * (1 - 0) / 2 = 1.5
{partitionID: 1, x: 2, y: 1, integral: 1.5}, // (1 + 2) * (2 - 1) / 2 = 1.5
{partitionID: 1, x: 3, y: 4, integral: 2.5}, // (4 + 1) * (3 - 2) / 2 = 2.5
{partitionID: 2, x: 0, y: 100, integral: 0}, //
{partitionID: 2, x: 2, y: 105, integral: 205}, // (100 + 105) * 2 / 2 = 205
{partitionID: 2, x: 4, y: 107, integral: 212}, // (105 + 107) * 2 / 2 = 212
{partitionID: 2, x: 6, y: -100, integral: 7}, // (107 - 100) * 2 / 2 = 7
]);
// 'outputUnit' only supports 'week' and smaller.
coll.drop();
function explainUnit(outputUnit) {
return coll.runCommand({
explain: {
aggregate: coll.getName(),
cursor: {},
pipeline: [{
$setWindowFields: {
sortBy: {x: 1},
output: {
integral: {
$integral: {
input: "$y",
outputUnit: outputUnit,
},
window: {documents: [-1, 1]}
},
}
}
}]
}
});
}
assert.commandFailedWithCode(explainUnit('year'), 5490704);
assert.commandFailedWithCode(explainUnit('quarter'), 5490704);
assert.commandFailedWithCode(explainUnit('month'), 5490704);
assert.commandWorked(explainUnit('week'));
assert.commandWorked(explainUnit('day'));
assert.commandWorked(explainUnit('hour'));
assert.commandWorked(explainUnit('minute'));
assert.commandWorked(explainUnit('second'));
assert.commandWorked(explainUnit('millisecond'));
// Test if 'outputUnit' is specified. Date type input is supported.
coll.drop();
assert.commandWorked(coll.insert([
{x: ISODate("2020-01-01T00:00:00.000Z"), y: 0},
{x: ISODate("2020-01-01T00:00:00.002Z"), y: 2},
{x: ISODate("2020-01-01T00:00:00.004Z"), y: 4},
{x: ISODate("2020-01-01T00:00:00.006Z"), y: 6},
]));
const pipelineWithOutputUnit = [
{
$setWindowFields: {
sortBy: {x: 1},
output: {
integral:
{$integral: {input: "$y", outputUnit: 'second'}, window: {documents: [-1, 1]}},
}
}
},
{$unset: "_id"},
];
result = coll.aggregate(pipelineWithOutputUnit).toArray();
assert.sameMembers(result, [
// We should scale the result by 'millisecond/second'.
{x: ISODate("2020-01-01T00:00:00.000Z"), y: 0, integral: 0.002},
{x: ISODate("2020-01-01T00:00:00.002Z"), y: 2, integral: 0.008},
{x: ISODate("2020-01-01T00:00:00.004Z"), y: 4, integral: 0.016},
{x: ISODate("2020-01-01T00:00:00.006Z"), y: 6, integral: 0.010},
]);
const pipelineWithNoOutputUnit = [
{
$setWindowFields: {
sortBy: {x: 1},
output: {
integral: {$integral: {input: "$y"}, window: {documents: [-1, 1]}},
}
}
},
{$unset: "_id"},
];
// 'outputUnit' is only valid if the 'sortBy' values are ISODate objects.
// Dates are only valid if 'outputUnit' is specified.
coll.drop();
assert.commandWorked(coll.insert([
{x: 0, y: 100},
{x: 1, y: 100},
{x: ISODate("2020-01-01T00:00:00.000Z"), y: 5},
{x: ISODate("2020-01-01T00:00:00.001Z"), y: 4},
]));
assert.commandFailedWithCode(db.runCommand({
aggregate: "setWindowFields_integral",
pipeline: pipelineWithOutputUnit,
cursor: {},
}),
5423901);
assert.commandFailedWithCode(db.runCommand({
aggregate: "setWindowFields_integral",
pipeline: pipelineWithNoOutputUnit,
cursor: {},
}),
5423902);
// Test various type of window. Only test the stability not testing the actual result.
coll.drop();
assert.commandWorked(coll.insert([
{x: 0, y: 0},
{x: 1, y: 42},
{x: 3, y: 67},
]));
documentBounds.forEach(function(bounds) {
const res = assert.commandWorked(coll.runCommand({
aggregate: coll.getName(),
cursor: {},
pipeline: [
{
$setWindowFields: {
sortBy: {x: 1},
output: {
integral: {$integral: {input: "$y"}, window: {documents: bounds}},
}
}
},
]
}));
assert.eq(res.cursor.firstBatch.length, 3);
});
})();
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