class TracingTensorHandle : public AbstractTensorHandle {
 protected:
  explicit TracingTensorHandle(AbstractTensorHandleKind kind)
      : AbstractTensorHandle(kind) {}

 public:
  // For LLVM style RTTI.
  static bool classof(const AbstractTensorHandle* ptr) {
    return ptr->getKind() == kGraph || ptr->getKind() == kMlir;
  }
};

// An abstract operation describes an operation by its type, name, and

	EnvNSQQueueLimit    = "MINIO_NOTIFY_NSQ_QUEUE_LIMIT"
)

// NSQArgs - NSQ target arguments.
type NSQArgs struct {
	Enable      bool      `json:"enable"`
	NSQDAddress xnet.Host `json:"nsqdAddress"`
	Topic       string    `json:"topic"`
	TLS         struct {
		Enable     bool `json:"enable"`
		SkipVerify bool `json:"skipVerify"`
	} `json:"tls"`
	QueueDir   string `json:"queueDir"`
	QueueLimit uint64 `json:"queueLimit"`
}

)

// Config - kafka target arguments.
type Config struct {
	Enabled bool        `json:"enable"`
	Brokers []xnet.Host `json:"brokers"`
	Topic   string      `json:"topic"`
	Version string      `json:"version"`
	TLS     struct {
		Enable        bool               `json:"enable"`
		RootCAs       *x509.CertPool     `json:"-"`
		SkipVerify    bool               `json:"skipVerify"`
		ClientAuth    tls.ClientAuthType `json:"clientAuth"`

	// of this function is to know if the "drive" has "format.json" or not
	// if it has a "format.json" then is it correct "format.json" or not.
	IsOnline() bool

	// Returns the last time this disk (re)-connected
	LastConn() time.Time

	// Indicates if disk is local or not.
	IsLocal() bool

	// Returns hostname if disk is remote.
	Hostname() string

	// Returns the entire endpoint.
	Endpoint() Endpoint

		URL:    &url.URL{Path: grid.RouteLockPath},
	}
	if !guessIsRPCReq(r) {
		t.Fatal("Grid RPC path not detected")
	}
}

var isHTTPHeaderSizeTooLargeTests = []struct {
	header     http.Header
	shouldFail bool
}{
	{header: generateHeader(0, 0), shouldFail: false},
	{header: generateHeader(1024, 0), shouldFail: false},
	{header: generateHeader(2048, 0), shouldFail: false},
	{header: generateHeader(8*1024+1, 0), shouldFail: true},

func IsValidObjectName(object string) bool {
	if len(object) == 0 {
		return false
	}
	if HasSuffix(object, SlashSeparator) {
		return false
	}
	return IsValidObjectPrefix(object)
}

// IsValidObjectPrefix verifies whether the prefix is a valid object name.
// Its valid to have a empty prefix.
func IsValidObjectPrefix(object string) bool {
	if hasBadPathComponent(object) {
		return false
	}

type JSONPathElement struct {
	Key            *ObjectKey `parser:"  @@"`               // ['name'] and .name forms
	Index          *int       `parser:"| \"[\" @Int \"]\""` // [3] form
	ObjectWildcard bool       `parser:"| @\".*\""`          // .* form
	ArrayWildcard  bool       `parser:"| @\"[*]\""`         // [*] form
}

// JSONPath represents a keypath.
// Instances should be treated idempotent and not change once created.
type JSONPath struct {

	}

	readTriggerCh := make(chan bool, len(p.readers))
	defer xioutil.SafeClose(readTriggerCh) // close the channel upon return

	for i := 0; i < p.dataBlocks; i++ {
		// Setup read triggers for p.dataBlocks number of reads so that it reads in parallel.
		readTriggerCh <- true
	}

	disksNotFound := int32(0)
	bitrotHeal := int32(0)       // Atomic bool flag.
	missingPartsHeal := int32(0) // Atomic bool flag.

// SelectAndOmitColumns get select and omit columns, select -> true, omit -> false
func (stmt *Statement) SelectAndOmitColumns(requireCreate, requireUpdate bool) (map[string]bool, bool) {
	results := map[string]bool{}
	notRestricted := false

	processColumn := func(column string, result bool) {
		if stmt.Schema == nil {
			results[column] = result
		} else if column == "*" {
			notRestricted = result

}

// Expr raw expression
type Expr struct {
	SQL                string
	Vars               []interface{}
	WithoutParentheses bool
}

// Build build raw expression
func (expr Expr) Build(builder Builder) {
	var (
		afterParenthesis bool
		idx              int
	)

	for _, v := range []byte(expr.SQL) {
		if v == '?' && len(expr.Vars) > idx {
			if afterParenthesis || expr.WithoutParentheses {