60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
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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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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const serverVer = db.version().split('.');
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if ((serverVer[0] == 7 && serverVer[1] >= 3) || serverVer[0] > 7) {
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// Starting in 7.3 running explain() against a non-existent database should result in
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// an EOF plan against mongos or mongod.
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let dbdne = db.getSiblingDB("does_not_exist_hopefully");
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var explain = dbdne.runCommand(
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{explain: {find: collName, filter: {a: {$lte: 2}}}, verbosity: "executionStats"});
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assert.commandWorked(explain);
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// Explain output differs slightly under SBE versus classic engine
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if (explain.queryPlanner.winningPlan.queryPlan) {
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assert.eq("EOF", explain.queryPlanner.winningPlan.queryPlan.stage)
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} else {
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assert.eq("EOF", explain.queryPlanner.winningPlan.stage)
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}
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assert.eq("does_not_exist_hopefully.jstests_explain_find", explain.queryPlanner.namespace)
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assert.eq({"a": {"$lte": 2}}, explain.queryPlanner.parsedQuery)
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}
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