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/**
* Test that the 'n' family of accumulators work as window functions.
*/
(function() {
"use strict";
load("jstests/aggregation/extras/window_function_helpers.js");
const coll = db[jsTestName()];
coll.drop();
const needsSortBy = (op) => ({
$minN: false,
$maxN: false,
$firstN: false,
$lastN: false,
$topN: true,
$bottomN: true,
$top: true,
$bottom: true,
}[op]);
// A map from the accumulator name to a function that ignores the parameters it doesn't need and
// generates a valid accumulator spec.
const simple = (n, input) => ({n, input: "$" + input});
const topBottomN = (n, output) => ({n, output: "$" + output, sortBy: {[output]: 1}});
const topBottom = (n, output) => ({output: "$" + output, sortBy: {[output]: 1}});
const nAccumulators = {
$minN: simple,
$maxN: simple,
$firstN: simple,
$lastN: simple,
$topN: topBottomN,
$bottomN: topBottomN,
$top: topBottom,
$bottom: topBottom,
};
// Create a collection of tickers and prices.
const nDocsPerTicker = 10;
seedWithTickerData(coll, nDocsPerTicker);
for (const acc of Object.keys(nAccumulators)) {
for (const nValue of [4, 7, 12]) {
jsTestLog("Testing accumulator " + tojson(acc) + " with 'n' set to " + tojson(nValue));
const noValue = (acc === "$top" || acc === "$bottom") ? null : [];
testAccumAgainstGroup(coll, acc, noValue, nAccumulators[acc](nValue, "price"));
}
// Verify that the accumulator will not throw if the 'n' expression evaluates to a constant.
const pipeline = [
{
$setWindowFields: {
partitionBy: "$ticker",
sortBy: {_id: 1},
output: {res: {[acc]: nAccumulators[acc]({$add: [1, 2]}, "price")}}
},
},
];
assert.doesNotThrow(() => coll.aggregate(pipeline).toArray());
// Error cases.
function testError(accSpec, expectedCode) {
assert.throwsWithCode(() => coll.aggregate([{
$setWindowFields: {
partitionBy: "$ticket",
sortBy: {ts: 1},
output: {outputField: accSpec},
}
}]),
expectedCode);
}
// The parsers for $minN/$maxN and $firstN/$lastN will use different codes to indicate a
// parsing error due to a non-object specification.
const expectedCode = (acc === "$minN" || acc === "$maxN") ? 5787900 : 5787801;
if (!needsSortBy(acc)) {
// Invalid/missing accumulator specification.
testError({[acc]: "non object"}, expectedCode);
testError({window: {documents: [-1, 1]}}, ErrorCodes.FailedToParse);
testError({[acc]: {n: 2}, window: {documents: [-1, 1]}}, 5787907);
testError({[acc]: {input: "$foo"}, window: {documents: [-1, 1]}}, 5787906);
testError({[acc]: {input: "$foo", n: 2.1}, window: {documents: [-1, 1]}}, 5787903);
// Invalid window specification.
testError({[acc]: {input: "$foo", n: 2.0}, window: [-1, 1]}, ErrorCodes.FailedToParse);
// Non constant argument for 'n'.
testError({[acc]: {input: "$foo", n: "$a"}, window: {documents: [-1, 1]}}, 5787902);
// Can't reference partition key.
testError({[acc]: {input: "$foo", n: "$ticket"}, window: {documents: [-1, 1]}}, 5787902);
// n = 0
testError({[acc]: {input: "$foo", n: 0}, window: {documents: [-1, 1]}}, 5787908);
// n < 0
testError({[acc]: {input: "$foo", n: -100}, window: {documents: [-1, 1]}}, 5787908);
} else if (acc == "$topN" || acc == "$bottomN") {
// TODO SERVER-59327 combine error codes if we decide to use the same parser function.
// Invalid/missing accumulator specification.
const sortBy = {"foo": 1};
const output = "$foo";
testError({[acc]: "non object"}, 5788001);
testError({window: {documents: [-1, 1]}}, ErrorCodes.FailedToParse);
testError({[acc]: {n: 2, sortBy}, window: {documents: [-1, 1]}}, 5788004);
testError({[acc]: {output, sortBy}, window: {documents: [-1, 1]}}, 5788003);
testError({[acc]: {output, sortBy, n: 2.1}, window: {documents: [-1, 1]}}, 5787903);
// Missing sortBy.
testError({[acc]: {output, n: 2}, window: {documents: [-1, 1]}}, 5788005);
// Invalid window specification.
testError({[acc]: {output, sortBy, n: 2.0}, window: [-1, 1]}, ErrorCodes.FailedToParse);
// Non constant argument for 'n'.
testError({[acc]: {output, sortBy, n: "$a"}, window: {documents: [-1, 1]}}, 5787902);
// Can't reference partition key.
testError({[acc]: {output, sortBy, n: "$ticket"}, window: {documents: [-1, 1]}}, 5787902);
// n = 0
testError({[acc]: {output, sortBy, n: 0}, window: {documents: [-1, 1]}}, 5787908);
// n < 0
testError({[acc]: {output, sortBy, n: -100}, window: {documents: [-1, 1]}}, 5787908);
} else {
// $top/$bottom parsing tests.
const sortBy = {"foo": 1};
const output = "$foo";
testError({[acc]: "non object"}, 5788001);
testError({window: {documents: [-1, 1]}}, ErrorCodes.FailedToParse);
testError({[acc]: {sortBy}, window: {documents: [-1, 1]}}, 5788004);
testError({[acc]: {n: 2, output, sortBy}, window: {documents: [-1, 1]}}, 5788002);
// Missing sortBy.
testError({[acc]: {output}, window: {documents: [-1, 1]}}, 5788005);
}
}
})();
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