44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
// Tests for explaining find through the explain command.
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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.ensureIndex({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 = db.runCommand({
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explain: {
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find: collName,
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filter: {a: {$lte: 2}}
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},
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verbosity: "executionStats"
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});
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printjson(explain);
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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: {
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find: collName,
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min: {a: 4},
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max: {a: 6}
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},
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verbosity: "executionStats"
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});
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printjson(explain);
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assert.commandWorked(explain);
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assert.eq(2, explain.executionStats.nReturned);
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// Compatibility test for the $explain OP_QUERY flag. This can only run if find command is disabled.
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if (!db.getMongo().useReadCommands()) {
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var explain = t.find({$query: {a: 4}, $explain: true}).limit(-1).next();
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assert("queryPlanner" in explain);
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assert("executionStats" in explain);
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assert.eq(1, explain.executionStats.nReturned);
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assert("allPlansExecution" in explain.executionStats);
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}
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