41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
/**
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* Test that standard deviation works as a window function.
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*/
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import {
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seedWithTickerData,
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testAccumAgainstGroup
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} from "jstests/aggregation/extras/window_function_helpers.js";
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const coll = db[jsTestName()];
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coll.drop();
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// Create a collection of tickers and prices.
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const nDocsPerTicker = 10;
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seedWithTickerData(coll, nDocsPerTicker);
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// Run the suite of partition and bounds tests against the $stdDevPop function.
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testAccumAgainstGroup(coll, "$stdDevPop");
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// Run the suite of partition and bounds tests against the $stdDevSamp function.
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testAccumAgainstGroup(coll, "$stdDevSamp");
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// Test that $stdDevPop and $stdDevSamp return null for windows which do not contain numeric values.
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let results =
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coll.aggregate([
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{$addFields: {str: "hiya"}},
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{
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$setWindowFields: {
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sortBy: {ts: 1},
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output: {
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stdDevPop:
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{$stdDevPop: "$str", window: {documents: ["unbounded", "current"]}},
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stdDevSamp:
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{$stdDevSamp: "$str", window: {documents: ["unbounded", "current"]}},
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}
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}
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}
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])
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.toArray();
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for (let index = 0; index < results.length; index++) {
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assert.eq(null, results[index].stdDevPop);
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assert.eq(null, results[index].stdDevSamp);
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} |