45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
// Check explain results for a plan that uses an index to obtain the requested sort order.
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// @tags: [
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// assumes_balancer_off,
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// assumes_read_concern_local,
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// operations_longer_than_stepdown_interval, // large bulk inserts
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// ]
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(function() {
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'use strict';
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const t = db.jstests_explain5;
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t.drop();
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assert.commandWorked(t.createIndexes([
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{a: 1},
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{b: 1},
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]));
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let docs = [];
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for (let i = 0; i < 1000; ++i) {
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docs.push({_id: i, a: i, b: i % 3});
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}
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assert.commandWorked(t.insert(docs));
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// Query with an initial set of documents.
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const explain1 = t.find({a: {$gte: 0}, b: 2}).sort({a: 1}).hint({a: 1}).explain("executionStats");
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jsTestLog('explain5 explain output after initial documents: ' + tojson(explain1));
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const stats1 = explain1.executionStats;
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assert.eq(333, stats1.nReturned, 'wrong nReturned for explain1');
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assert.eq(1000, stats1.totalKeysExamined, 'wrong totalKeysExamined for explain1');
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docs = [];
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for (let i = 1000; i < 2000; ++i) {
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docs.push({_id: i, a: i, b: i % 3});
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}
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assert.commandWorked(t.insert(docs));
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// Query with some additional documents.
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const explain2 = t.find({a: {$gte: 0}, b: 2}).sort({a: 1}).hint({a: 1}).explain("executionStats");
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jsTestLog('explain5 explain output after additional documents: ' + tojson(explain2));
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const stats2 = explain2.executionStats;
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assert.eq(666, stats2.nReturned, 'wrong nReturned for explain2');
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assert.eq(2000, stats2.totalKeysExamined, 'wrong totalKeysExamined for explain2');
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})();
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