44 lines
1022 B
JavaScript
44 lines
1022 B
JavaScript
/**
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* Tests for explaining find through the explain command.
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* @tags: [
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* assumes_read_concern_local,
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* ]
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*/
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(function() {
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"use strict";
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var collName = "jstests_explain_find";
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var t = db[collName];
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t.drop();
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t.createIndex({a: 1});
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for (var i = 0; i < 10; i++) {
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t.insert({_id: i, a: i});
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}
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var explain =
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db.runCommand({explain: {find: collName, filter: {a: {$lte: 2}}}, verbosity: "executionStats"});
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assert.commandWorked(explain);
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assert.eq(3, explain.executionStats.nReturned);
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explain = db.runCommand({
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explain: {find: collName, min: {a: 4}, max: {a: 6}, hint: {a: 1}},
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verbosity: "executionStats",
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});
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assert.commandWorked(explain);
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assert.eq(2, explain.executionStats.nReturned);
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// Invalid verbosity string.
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let error = assert.throws(function() {
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t.explain("foobar").find().finish();
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});
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assert.commandFailedWithCode(error, ErrorCodes.BadValue);
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error = assert.throws(function() {
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t.find().explain("foobar");
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});
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assert.commandFailedWithCode(error, ErrorCodes.BadValue);
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}());
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