import "github.com.youtube.vitess.go.vt.vtgate.proto" // Example 1: handling a QueryResultError returned by vtgate func executeQuery() error { result, err := vtgate.Execute(..) if err != nil { if qErr, ok := err.(*proto.QueryResultError); ok { // handle QueryResultError // e.g. log error, return custom error with code/message, etc. } // handle other errors } // handle successful result } // Example 2: creating a QueryResultError func createError() *proto.QueryResultError { return &proto.QueryResultError{ ErrorCode: 1001, ErrorMessage: "Query timed out", } }In the first example, we handle a QueryResultError that was returned by the "vtgate.Execute" function. We check if the error is a QueryResultError using a type assertion and then handle it appropriately. In the second example, we create a new QueryResultError with an error code of 1001 and a message of "Query timed out". This can be used for testing purposes or to return custom errors from our own functions.