jstests/core/explain_db_mismatch.js


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// Ensure that explain command errors if the inner command has a $db field that doesn't match the
// outer command.
(function() {
    assert.commandFailedWithCode(
        db.runCommand({explain: {find: 'some_collection', $db: 'not_my_db'}}),
        ErrorCodes.InvalidNamespace);
}());