// Expression represents a logical disjunction of clauses
type Expression struct {
	And []*AndCondition `parser:"@@ ( \"OR\" @@ )*"`
}

// ListExpr represents a literal list with elements as expressions.
type ListExpr struct {
	Elements []*Expression `parser:"\"(\" @@ ( \",\" @@ )* \")\" | \"[\" @@ ( \",\" @@ )* \"]\""`
}

// AndCondition represents logical conjunction of clauses
type AndCondition struct {

	ErrStorageClassValue = newErrFn(
		"Invalid storage class value",
		"Please check the value",
		`MINIO_STORAGE_CLASS_STANDARD: Format "EC:<Default_Parity_Standard_Class>" (e.g. "EC:3"). This sets the number of parity drives for MinIO server in Standard mode. Objects are stored in Standard mode, if storage class is not defined in Put request

)

var (
	errInvalidASTNode    = errors.New("invalid AST Node")
	errExpectedBool      = errors.New("expected bool")
	errLikeNonStrArg     = errors.New("LIKE clause requires string arguments")
	errLikeInvalidEscape = errors.New("LIKE clause has invalid ESCAPE character")
	errNotImplemented    = errors.New("not implemented")
)

// AST Node Evaluation functions
//

	}

	userDefined := cloneMSS(opts.UserDefined)
	if opts.PreserveETag != "" {
		userDefined["etag"] = opts.PreserveETag
	}
	onlineDisks := er.getDisks()

	// Get parity and data drive count based on storage class metadata
	parityDrives := globalStorageClass.GetParityForSC(userDefined[xhttp.AmzStorageClass])
	if parityDrives < 0 {
		parityDrives = er.defaultParityCount
	}

	if globalStorageClass.AvailabilityOptimized() {

	_, err = j.UnmarshalMsg(job)
	return err
}

func batchReplicationOpts(ctx context.Context, sc string, objInfo ObjectInfo) (putOpts miniogo.PutObjectOptions, err error) {
	// TODO: support custom storage class for remote replication
	putOpts, err = putReplicationOpts(ctx, "", objInfo)
	if err != nil {
		return putOpts, err
	}
	putOpts.Internal = miniogo.AdvancedPutOptions{
		SourceVersionID:    objInfo.VersionID,

			keys:     []string{"etag", "md5"},
			want:     map[string]string{"content-type": "application/octet-stream", "x-amz-storage-class": "STANDARD"},
		},
		{
			name:     "2",
			metadata: map[string]string{"content-type": "application/octet-stream", "etag": "de75a98baf2c6aef435b57dd0fc33c86", "x-amz-storage-class": "REDUCED_REDUNDANCY", "md5sum": "abcde"},

		statusCode: 400,
		cause:      err,
	}
}

func errParseExpectedWhenClause(err error) *s3Error {
	return &s3Error{
		code:       "ParseExpectedWhenClause",
		message:    "Did not find the expected WHEN clause in the SQL expression. CASE is not supported.",
		statusCode: 400,
		cause:      err,
	}
}

func errParseUnsupportedToken(err error) *s3Error {
	return &s3Error{
		code:       "ParseUnsupportedToken",

	// Request tags used in GetObjectAttributes
	Checksum     = "Checksum"
	StorageClass = "StorageClass"
	ObjectSize   = "ObjectSize"
	ObjectParts  = "ObjectParts"

	// S3 storage class
	AmzStorageClass = "x-amz-storage-class"

	// S3 object version ID
	AmzVersionID    = "x-amz-version-id"
	AmzDeleteMarker = "x-amz-delete-marker"

	// S3 object tagging
	AmzObjectTagging = "X-Amz-Tagging"

	peerRESTSubSys         = "sub-sys"
	peerRESTProfiler       = "profiler"
	peerRESTSize           = "size"
	peerRESTConcurrent     = "concurrent"
	peerRESTDuration       = "duration"
	peerRESTStorageClass   = "storage-class"
	peerRESTEnableSha256   = "enableSha256"
	peerRESTMetricsTypes   = "types"
	peerRESTDisk           = "disk"
	peerRESTHost           = "host"
	peerRESTJobID          = "job-id"
	peerRESTDepID          = "depID"

		return rules[i].Priority > rules[j].Priority && rules[i].Destination.String() == rules[j].Destination.String()
	})

	return rules
}

// GetDestination returns destination bucket and storage class.
func (c Config) GetDestination() Destination {
	if len(c.Rules) > 0 {
		return c.Rules[0].Destination
	}
	return Destination{}
}

// Replicate returns true if the object should be replicated.