The on-storage meta-data of an ntuple.

Represents the on-disk (on storage) information about an ntuple. The meta-data consists of a header and one or several footers. The header carries the ntuple schema, i.e. the fields and the associated columns and their relationships. The footer(s) carry information about one or several clusters. For every cluster, a footer stores its location and size, and for every column the range of element indexes as well as a list of pages and page locations.

The descriptor provide machine-independent (de-)serialization of headers and footers, and it provides lookup routines for ntuple objects (pages, clusters, ...). It is supposed to be usable by all RPageStorage implementations.

The serialization does not use standard ROOT streamers in order to not let it depend on libCore. The serialization uses the concept of frames: header, footer, and substructures have a preamble with version numbers and the size of the writte struct. This allows for forward and backward compatibility when the meta-data evolves.

Definition at line 539 of file RNTupleDescriptor.hxx.

Classes
class	RClusterDescriptorIterable
	Used to loop over all the clusters of an ntuple (in unspecified order) More...

class	RClusterGroupDescriptorIterable
	Used to loop over all the cluster groups of an ntuple (in unspecified order) More...

class	RColumnDescriptorIterable
	Used to loop over a field's associated columns. More...

struct	RCreateModelOptions
	Modifiers passed to `CreateModel` More...

class	RExtraTypeInfoDescriptorIterable
	Used to loop over all the extra type info record of an ntuple (in unspecified order) More...

class	RFieldDescriptorIterable
	Used to loop over a field's child fields. More...

class	RHeaderExtension
	Summarizes information about fields and the corresponding columns that were added after the header has been serialized. More...

Public Member Functions
	RNTupleDescriptor ()=default

	RNTupleDescriptor (const RNTupleDescriptor &other)=delete

	RNTupleDescriptor (RNTupleDescriptor &&other)=default

RResult< void >	AddClusterGroupDetails (DescriptorId_t clusterGroupId, std::vector< RClusterDescriptor > &clusterDescs)
	Methods to load and drop cluster group details (cluster IDs and page locations)

RNTupleDescriptor	Clone () const

std::unique_ptr< RNTupleModel >	CreateModel (const RCreateModelOptions &options=RCreateModelOptions()) const
	Re-create the C++ model from the stored meta-data.

RResult< void >	DropClusterGroupDetails (DescriptorId_t clusterGroupId)

DescriptorId_t	FindClusterId (DescriptorId_t physicalColumnId, NTupleSize_t index) const

DescriptorId_t	FindFieldId (std::string_view fieldName) const
	Searches for a top-level field.

DescriptorId_t	FindFieldId (std::string_view fieldName, DescriptorId_t parentId) const

DescriptorId_t	FindLogicalColumnId (DescriptorId_t fieldId, std::uint32_t columnIndex, std::uint16_t representationIndex) const

DescriptorId_t	FindNextClusterId (DescriptorId_t clusterId) const

DescriptorId_t	FindPhysicalColumnId (DescriptorId_t fieldId, std::uint32_t columnIndex, std::uint16_t representationIndex) const

DescriptorId_t	FindPrevClusterId (DescriptorId_t clusterId) const

const RClusterDescriptor &	GetClusterDescriptor (DescriptorId_t clusterId) const

const RClusterGroupDescriptor &	GetClusterGroupDescriptor (DescriptorId_t clusterGroupId) const

RClusterGroupDescriptorIterable	GetClusterGroupIterable () const

RClusterDescriptorIterable	GetClusterIterable () const

const RColumnDescriptor &	GetColumnDescriptor (DescriptorId_t columnId) const

RColumnDescriptorIterable	GetColumnIterable () const

RColumnDescriptorIterable	GetColumnIterable (const RFieldDescriptor &fieldDesc) const

RColumnDescriptorIterable	GetColumnIterable (DescriptorId_t fieldId) const

const std::string &	GetDescription () const

RExtraTypeInfoDescriptorIterable	GetExtraTypeInfoIterable () const

std::vector< std::uint64_t >	GetFeatureFlags () const

const RFieldDescriptor &	GetFieldDescriptor (DescriptorId_t fieldId) const

RFieldDescriptorIterable	GetFieldIterable (const RFieldDescriptor &fieldDesc) const

RFieldDescriptorIterable	GetFieldIterable (const RFieldDescriptor &fieldDesc, const std::function< bool(DescriptorId_t, DescriptorId_t)> &comparator) const

RFieldDescriptorIterable	GetFieldIterable (DescriptorId_t fieldId) const

RFieldDescriptorIterable	GetFieldIterable (DescriptorId_t fieldId, const std::function< bool(DescriptorId_t, DescriptorId_t)> &comparator) const

const RFieldDescriptor &	GetFieldZero () const

DescriptorId_t	GetFieldZeroId () const
	Returns the logical parent of all top-level NTuple data fields.

std::uint64_t	GetGeneration () const

const RHeaderExtension *	GetHeaderExtension () const
	Return header extension information; if the descriptor does not have a header extension, return `nullptr`

std::size_t	GetNActiveClusters () const

const std::string &	GetName () const

std::size_t	GetNClusterGroups () const

std::size_t	GetNClusters () const

NTupleSize_t	GetNElements (DescriptorId_t physicalColumnId) const

NTupleSize_t	GetNEntries () const
	We know the number of entries from adding the cluster summaries.

std::size_t	GetNExtraTypeInfos () const

std::size_t	GetNFields () const

std::size_t	GetNLogicalColumns () const

std::size_t	GetNPhysicalColumns () const

std::uint64_t	GetOnDiskFooterSize () const

std::uint64_t	GetOnDiskHeaderSize () const

std::uint64_t	GetOnDiskHeaderXxHash3 () const

std::string	GetQualifiedFieldName (DescriptorId_t fieldId) const
	Walks up the parents of the field ID and returns a field name of the form a.b.c.d In case of invalid field ID, an empty string is returned.

RFieldDescriptorIterable	GetTopLevelFields () const

RFieldDescriptorIterable	GetTopLevelFields (const std::function< bool(DescriptorId_t, DescriptorId_t)> &comparator) const

bool	HasFeature (unsigned int flag) const

void	IncGeneration ()

RNTupleDescriptor &	operator= (const RNTupleDescriptor &other)=delete

RNTupleDescriptor &	operator= (RNTupleDescriptor &&other)=default

bool	operator== (const RNTupleDescriptor &other) const

void	PrintInfo (std::ostream &output) const

Static Public Attributes
static constexpr unsigned int	kFeatureFlagTest = 137

Private Member Functions
DescriptorId_t	FindClusterId (NTupleSize_t entryIdx) const

Private Attributes
std::unordered_map< DescriptorId_t, RClusterDescriptor >	fClusterDescriptors
	May contain only a subset of all the available clusters, e.g.

std::unordered_map< DescriptorId_t, RClusterGroupDescriptor >	fClusterGroupDescriptors

std::unordered_map< DescriptorId_t, RColumnDescriptor >	fColumnDescriptors

std::string	fDescription
	Free text from the user.

std::vector< RExtraTypeInfoDescriptor >	fExtraTypeInfoDescriptors

std::set< unsigned int >	fFeatureFlags

std::unordered_map< DescriptorId_t, RFieldDescriptor >	fFieldDescriptors

DescriptorId_t	fFieldZeroId = kInvalidDescriptorId
	Set by the descriptor builder.

std::uint64_t	fGeneration = 0
	Once constructed by an RNTupleDescriptorBuilder, the descriptor is mostly immutable except for set of active the page locations.

std::unique_ptr< RHeaderExtension >	fHeaderExtension

std::string	fName
	The ntuple name needs to be unique in a given storage location (file)

std::uint64_t	fNClusters = 0
	Updated by the descriptor builder when the cluster groups are added.

std::uint64_t	fNEntries = 0
	Updated by the descriptor builder when the cluster groups are added.

std::uint64_t	fNPhysicalColumns = 0
	Updated by the descriptor builder when columns are added.

std::uint64_t	fOnDiskFooterSize = 0
	Like fOnDiskHeaderSize, contains both cluster summaries and page locations.

std::uint64_t	fOnDiskHeaderSize = 0
	Set by the descriptor builder when deserialized.

std::uint64_t	fOnDiskHeaderXxHash3 = 0
	Set by the descriptor builder when deserialized.

std::vector< DescriptorId_t >	fSortedClusterGroupIds
	References cluster groups sorted by entry range and thus allows for binary search.

Friends
class	Internal::RNTupleDescriptorBuilder

#include <ROOT/RNTupleDescriptor.hxx>

Constructor & Destructor Documentation

◆ RNTupleDescriptor() [1/3]

ROOT::Experimental::RNTupleDescriptor::RNTupleDescriptor ( )

default

◆ RNTupleDescriptor() [2/3]

ROOT::Experimental::RNTupleDescriptor::RNTupleDescriptor ( const RNTupleDescriptor & other )

delete

◆ RNTupleDescriptor() [3/3]

ROOT::Experimental::RNTupleDescriptor::RNTupleDescriptor ( RNTupleDescriptor && other )

default

Member Function Documentation

◆ AddClusterGroupDetails()

ROOT::RResult< void > ROOT::Experimental::RNTupleDescriptor::AddClusterGroupDetails	(	DescriptorId_t	clusterGroupId,
		std::vector< RClusterDescriptor > &	clusterDescs )

Methods to load and drop cluster group details (cluster IDs and page locations)

Definition at line 597 of file RNTupleDescriptor.cxx.

◆ Clone()

ROOT::Experimental::RNTupleDescriptor ROOT::Experimental::RNTupleDescriptor::Clone ( ) const

Definition at line 666 of file RNTupleDescriptor.cxx.

◆ CreateModel()

std::unique_ptr< ROOT::Experimental::RNTupleModel > ROOT::Experimental::RNTupleDescriptor::CreateModel ( const RCreateModelOptions & options = RCreateModelOptions() ) const

Re-create the C++ model from the stored meta-data.

Definition at line 640 of file RNTupleDescriptor.cxx.

◆ DropClusterGroupDetails()

ROOT::RResult< void > ROOT::Experimental::RNTupleDescriptor::DropClusterGroupDetails ( DescriptorId_t clusterGroupId )

Definition at line 625 of file RNTupleDescriptor.cxx.

◆ FindClusterId() [1/2]

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindClusterId	(	DescriptorId_t	physicalColumnId,
		NTupleSize_t	index ) const

Definition at line 402 of file RNTupleDescriptor.cxx.

◆ FindClusterId() [2/2]

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindClusterId ( NTupleSize_t entryIdx ) const

private

Definition at line 460 of file RNTupleDescriptor.cxx.

◆ FindFieldId() [1/2]

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindFieldId ( std::string_view fieldName ) const

Searches for a top-level field.

Definition at line 371 of file RNTupleDescriptor.cxx.

◆ FindFieldId() [2/2]

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindFieldId	(	std::string_view	fieldName,
		DescriptorId_t	parentId ) const

Definition at line 340 of file RNTupleDescriptor.cxx.

◆ FindLogicalColumnId()

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindLogicalColumnId	(	DescriptorId_t	fieldId,
		std::uint32_t	columnIndex,
		std::uint16_t	representationIndex ) const

Definition at line 377 of file RNTupleDescriptor.cxx.

◆ FindNextClusterId()

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindNextClusterId ( DescriptorId_t clusterId ) const

Definition at line 513 of file RNTupleDescriptor.cxx.

◆ FindPhysicalColumnId()

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindPhysicalColumnId	(	DescriptorId_t	fieldId,
		std::uint32_t	columnIndex,
		std::uint16_t	representationIndex ) const

Definition at line 392 of file RNTupleDescriptor.cxx.

◆ FindPrevClusterId()

ROOT::Experimental::DescriptorId_t ROOT::Experimental::RNTupleDescriptor::FindPrevClusterId ( DescriptorId_t clusterId ) const

Definition at line 525 of file RNTupleDescriptor.cxx.

◆ GetClusterDescriptor()

const RClusterDescriptor & ROOT::Experimental::RNTupleDescriptor::GetClusterDescriptor ( DescriptorId_t clusterId ) const

inline

Definition at line 636 of file RNTupleDescriptor.hxx.

◆ GetClusterGroupDescriptor()

const RClusterGroupDescriptor & ROOT::Experimental::RNTupleDescriptor::GetClusterGroupDescriptor ( DescriptorId_t clusterGroupId ) const

inline

Definition at line 632 of file RNTupleDescriptor.hxx.

◆ GetClusterGroupIterable()

ROOT::Experimental::RNTupleDescriptor::RClusterGroupDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetClusterGroupIterable ( ) const

Definition at line 1357 of file RNTupleDescriptor.cxx.

◆ GetClusterIterable()

ROOT::Experimental::RNTupleDescriptor::RClusterDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetClusterIterable ( ) const

Definition at line 1363 of file RNTupleDescriptor.cxx.

◆ GetColumnDescriptor()

const RColumnDescriptor & ROOT::Experimental::RNTupleDescriptor::GetColumnDescriptor ( DescriptorId_t columnId ) const

inline

Definition at line 628 of file RNTupleDescriptor.hxx.

◆ GetColumnIterable() [1/3]

ROOT::Experimental::RNTupleDescriptor::RColumnDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetColumnIterable ( ) const

Definition at line 1339 of file RNTupleDescriptor.cxx.

◆ GetColumnIterable() [2/3]

ROOT::Experimental::RNTupleDescriptor::RColumnDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetColumnIterable ( const RFieldDescriptor & fieldDesc ) const

Definition at line 1345 of file RNTupleDescriptor.cxx.

◆ GetColumnIterable() [3/3]

ROOT::Experimental::RNTupleDescriptor::RColumnDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetColumnIterable ( DescriptorId_t fieldId ) const

Definition at line 1351 of file RNTupleDescriptor.cxx.

◆ GetDescription()

const std::string & ROOT::Experimental::RNTupleDescriptor::GetDescription ( ) const

inline

Definition at line 665 of file RNTupleDescriptor.hxx.

◆ GetExtraTypeInfoIterable()

ROOT::Experimental::RNTupleDescriptor::RExtraTypeInfoDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetExtraTypeInfoIterable ( ) const

Definition at line 1369 of file RNTupleDescriptor.cxx.

◆ GetFeatureFlags()

std::vector< std::uint64_t > ROOT::Experimental::RNTupleDescriptor::GetFeatureFlags ( ) const

Definition at line 576 of file RNTupleDescriptor.cxx.

◆ GetFieldDescriptor()

const RFieldDescriptor & ROOT::Experimental::RNTupleDescriptor::GetFieldDescriptor ( DescriptorId_t fieldId ) const

inline

Definition at line 627 of file RNTupleDescriptor.hxx.

◆ GetFieldIterable() [1/4]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetFieldIterable ( const RFieldDescriptor & fieldDesc ) const

Definition at line 1302 of file RNTupleDescriptor.cxx.

◆ GetFieldIterable() [2/4]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetFieldIterable	(	const RFieldDescriptor &	fieldDesc,
		const std::function< bool(DescriptorId_t, DescriptorId_t)> &	comparator ) const

Definition at line 1307 of file RNTupleDescriptor.cxx.

◆ GetFieldIterable() [3/4]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetFieldIterable ( DescriptorId_t fieldId ) const

Definition at line 1314 of file RNTupleDescriptor.cxx.

◆ GetFieldIterable() [4/4]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetFieldIterable	(	DescriptorId_t	fieldId,
		const std::function< bool(DescriptorId_t, DescriptorId_t)> &	comparator ) const

Definition at line 1319 of file RNTupleDescriptor.cxx.

◆ GetFieldZero()

const RFieldDescriptor & ROOT::Experimental::RNTupleDescriptor::GetFieldZero ( ) const

inline

Definition at line 681 of file RNTupleDescriptor.hxx.

◆ GetFieldZeroId()

DescriptorId_t ROOT::Experimental::RNTupleDescriptor::GetFieldZeroId ( ) const

inline

Returns the logical parent of all top-level NTuple data fields.

Definition at line 680 of file RNTupleDescriptor.hxx.

◆ GetGeneration()

std::uint64_t ROOT::Experimental::RNTupleDescriptor::GetGeneration ( ) const

inline

Definition at line 707 of file RNTupleDescriptor.hxx.

◆ GetHeaderExtension()

const RHeaderExtension * ROOT::Experimental::RNTupleDescriptor::GetHeaderExtension ( ) const

inline

Return header extension information; if the descriptor does not have a header extension, return nullptr

Definition at line 701 of file RNTupleDescriptor.hxx.

◆ GetNActiveClusters()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNActiveClusters ( ) const

inline

Definition at line 672 of file RNTupleDescriptor.hxx.

◆ GetName()

const std::string & ROOT::Experimental::RNTupleDescriptor::GetName ( ) const

inline

Definition at line 664 of file RNTupleDescriptor.hxx.

◆ GetNClusterGroups()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNClusterGroups ( ) const

inline

Definition at line 670 of file RNTupleDescriptor.hxx.

◆ GetNClusters()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNClusters ( ) const

inline

Definition at line 671 of file RNTupleDescriptor.hxx.

◆ GetNElements()

ROOT::Experimental::NTupleSize_t ROOT::Experimental::RNTupleDescriptor::GetNElements ( DescriptorId_t physicalColumnId ) const

Definition at line 327 of file RNTupleDescriptor.cxx.

◆ GetNEntries()

NTupleSize_t ROOT::Experimental::RNTupleDescriptor::GetNEntries ( ) const

inline

We know the number of entries from adding the cluster summaries.

Definition at line 676 of file RNTupleDescriptor.hxx.

◆ GetNExtraTypeInfos()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNExtraTypeInfos ( ) const

inline

Definition at line 673 of file RNTupleDescriptor.hxx.

◆ GetNFields()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNFields ( ) const

inline

Definition at line 667 of file RNTupleDescriptor.hxx.

◆ GetNLogicalColumns()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNLogicalColumns ( ) const

inline

Definition at line 668 of file RNTupleDescriptor.hxx.

◆ GetNPhysicalColumns()

std::size_t ROOT::Experimental::RNTupleDescriptor::GetNPhysicalColumns ( ) const

inline

Definition at line 669 of file RNTupleDescriptor.hxx.

◆ GetOnDiskFooterSize()

std::uint64_t ROOT::Experimental::RNTupleDescriptor::GetOnDiskFooterSize ( ) const

inline

Definition at line 625 of file RNTupleDescriptor.hxx.

◆ GetOnDiskHeaderSize()

std::uint64_t ROOT::Experimental::RNTupleDescriptor::GetOnDiskHeaderSize ( ) const

inline

Definition at line 624 of file RNTupleDescriptor.hxx.

◆ GetOnDiskHeaderXxHash3()

std::uint64_t ROOT::Experimental::RNTupleDescriptor::GetOnDiskHeaderXxHash3 ( ) const

inline

Definition at line 623 of file RNTupleDescriptor.hxx.

◆ GetQualifiedFieldName()

std::string ROOT::Experimental::RNTupleDescriptor::GetQualifiedFieldName ( DescriptorId_t fieldId ) const

Walks up the parents of the field ID and returns a field name of the form a.b.c.d In case of invalid field ID, an empty string is returned.

Definition at line 359 of file RNTupleDescriptor.cxx.

◆ GetTopLevelFields() [1/2]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetTopLevelFields ( ) const

Definition at line 1326 of file RNTupleDescriptor.cxx.

◆ GetTopLevelFields() [2/2]

ROOT::Experimental::RNTupleDescriptor::RFieldDescriptorIterable ROOT::Experimental::RNTupleDescriptor::GetTopLevelFields ( const std::function< bool(DescriptorId_t, DescriptorId_t)> & comparator ) const

Definition at line 1332 of file RNTupleDescriptor.cxx.

◆ HasFeature()

bool ROOT::Experimental::RNTupleDescriptor::HasFeature ( unsigned int flag ) const

inline

Definition at line 697 of file RNTupleDescriptor.hxx.

◆ IncGeneration()

void ROOT::Experimental::RNTupleDescriptor::IncGeneration ( )

inline

Definition at line 708 of file RNTupleDescriptor.hxx.

◆ operator=() [1/2]

RNTupleDescriptor & ROOT::Experimental::RNTupleDescriptor::operator= ( const RNTupleDescriptor & other )

delete

◆ operator=() [2/2]

RNTupleDescriptor & ROOT::Experimental::RNTupleDescriptor::operator= ( RNTupleDescriptor && other )

default

◆ operator==()

bool ROOT::Experimental::RNTupleDescriptor::operator== ( const RNTupleDescriptor & other ) const

Definition at line 311 of file RNTupleDescriptor.cxx.

◆ PrintInfo()

void ROOT::Experimental::RNTupleDescriptor::PrintInfo ( std::ostream & output ) const

Definition at line 83 of file RNTupleDescriptorFmt.cxx.

Friends And Related Symbol Documentation

◆ Internal::RNTupleDescriptorBuilder

friend class Internal::RNTupleDescriptorBuilder

friend

Definition at line 540 of file RNTupleDescriptor.hxx.

Member Data Documentation

◆ fClusterDescriptors

std::unordered_map<DescriptorId_t, RClusterDescriptor> ROOT::Experimental::RNTupleDescriptor::fClusterDescriptors

private

May contain only a subset of all the available clusters, e.g.

the clusters of the current file from a chain of files

Definition at line 580 of file RNTupleDescriptor.hxx.

◆ fClusterGroupDescriptors

std::unordered_map<DescriptorId_t, RClusterGroupDescriptor> ROOT::Experimental::RNTupleDescriptor::fClusterGroupDescriptors

private

Definition at line 573 of file RNTupleDescriptor.hxx.

◆ fColumnDescriptors

std::unordered_map<DescriptorId_t, RColumnDescriptor> ROOT::Experimental::RNTupleDescriptor::fColumnDescriptors

private

Definition at line 572 of file RNTupleDescriptor.hxx.

◆ fDescription

std::string ROOT::Experimental::RNTupleDescriptor::fDescription

private

Free text from the user.

Definition at line 549 of file RNTupleDescriptor.hxx.

◆ fExtraTypeInfoDescriptors

std::vector<RExtraTypeInfoDescriptor> ROOT::Experimental::RNTupleDescriptor::fExtraTypeInfoDescriptors

private

Definition at line 581 of file RNTupleDescriptor.hxx.

◆ fFeatureFlags

std::set<unsigned int> ROOT::Experimental::RNTupleDescriptor::fFeatureFlags

private

Definition at line 570 of file RNTupleDescriptor.hxx.

◆ fFieldDescriptors

std::unordered_map<DescriptorId_t, RFieldDescriptor> ROOT::Experimental::RNTupleDescriptor::fFieldDescriptors

private

Definition at line 571 of file RNTupleDescriptor.hxx.

◆ fFieldZeroId

DescriptorId_t ROOT::Experimental::RNTupleDescriptor::fFieldZeroId = kInvalidDescriptorId

private

Set by the descriptor builder.

Definition at line 559 of file RNTupleDescriptor.hxx.

◆ fGeneration

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fGeneration = 0

private

Once constructed by an RNTupleDescriptorBuilder, the descriptor is mostly immutable except for set of active the page locations.

During the lifetime of the descriptor, page location information for clusters can be added or removed. When this happens, the generation should be increased, so that users of the descriptor know that the information changed. The generation is increased, e.g., by the page source's exclusive lock guard around the descriptor. It is used, e.g., by the descriptor cache in RNTupleReader.

Definition at line 568 of file RNTupleDescriptor.hxx.

◆ fHeaderExtension

std::unique_ptr<RHeaderExtension> ROOT::Experimental::RNTupleDescriptor::fHeaderExtension

private

Definition at line 582 of file RNTupleDescriptor.hxx.

◆ fName

std::string ROOT::Experimental::RNTupleDescriptor::fName

private

The ntuple name needs to be unique in a given storage location (file)

Definition at line 547 of file RNTupleDescriptor.hxx.

◆ fNClusters

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fNClusters = 0

private

Updated by the descriptor builder when the cluster groups are added.

Definition at line 556 of file RNTupleDescriptor.hxx.

◆ fNEntries

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fNEntries = 0

private

Updated by the descriptor builder when the cluster groups are added.

Definition at line 555 of file RNTupleDescriptor.hxx.

◆ fNPhysicalColumns

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fNPhysicalColumns = 0

private

Updated by the descriptor builder when columns are added.

Definition at line 557 of file RNTupleDescriptor.hxx.

◆ fOnDiskFooterSize

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fOnDiskFooterSize = 0

private

Like fOnDiskHeaderSize, contains both cluster summaries and page locations.

Definition at line 553 of file RNTupleDescriptor.hxx.

◆ fOnDiskHeaderSize

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fOnDiskHeaderSize = 0

private

Set by the descriptor builder when deserialized.

Definition at line 552 of file RNTupleDescriptor.hxx.

◆ fOnDiskHeaderXxHash3

std::uint64_t ROOT::Experimental::RNTupleDescriptor::fOnDiskHeaderXxHash3 = 0

private

Set by the descriptor builder when deserialized.

Definition at line 551 of file RNTupleDescriptor.hxx.

◆ fSortedClusterGroupIds

std::vector<DescriptorId_t> ROOT::Experimental::RNTupleDescriptor::fSortedClusterGroupIds

private

References cluster groups sorted by entry range and thus allows for binary search.

Note that this list is empty during the descriptor building process and will only be created when the final descriptor is extracted from the builder.

Definition at line 577 of file RNTupleDescriptor.hxx.

◆ kFeatureFlagTest

constexpr unsigned int ROOT::Experimental::RNTupleDescriptor::kFeatureFlagTest = 137

staticconstexpr

Definition at line 588 of file RNTupleDescriptor.hxx.

Libraries for ROOT::Experimental::RNTupleDescriptor:

[legend]

The documentation for this class was generated from the following files:

tree/ntuple/v7/inc/ROOT/RNTupleDescriptor.hxx
tree/ntuple/v7/src/RNTupleDescriptor.cxx
tree/ntuple/v7/src/RNTupleDescriptorFmt.cxx

Classes

Public Member Functions

Static Public Attributes

Private Member Functions

Private Attributes

Friends

Constructor & Destructor Documentation

◆ RNTupleDescriptor() [1/3]

◆ RNTupleDescriptor() [2/3]

◆ RNTupleDescriptor() [3/3]

Member Function Documentation

◆ AddClusterGroupDetails()

◆ Clone()

◆ CreateModel()

◆ DropClusterGroupDetails()

◆ FindClusterId() [1/2]

◆ FindClusterId() [2/2]

◆ FindFieldId() [1/2]

◆ FindFieldId() [2/2]

◆ FindLogicalColumnId()

◆ FindNextClusterId()

◆ FindPhysicalColumnId()

◆ FindPrevClusterId()

◆ GetClusterDescriptor()

◆ GetClusterGroupDescriptor()

◆ GetClusterGroupIterable()

◆ GetClusterIterable()

◆ GetColumnDescriptor()

◆ GetColumnIterable() [1/3]

◆ GetColumnIterable() [2/3]

◆ GetColumnIterable() [3/3]

◆ GetDescription()

◆ GetExtraTypeInfoIterable()

◆ GetFeatureFlags()

◆ GetFieldDescriptor()

◆ GetFieldIterable() [1/4]

◆ GetFieldIterable() [2/4]

◆ GetFieldIterable() [3/4]

◆ GetFieldIterable() [4/4]

◆ GetFieldZero()

◆ GetFieldZeroId()

◆ GetGeneration()

◆ GetHeaderExtension()

◆ GetNActiveClusters()

◆ GetName()

◆ GetNClusterGroups()

◆ GetNClusters()

◆ GetNElements()

◆ GetNEntries()

◆ GetNExtraTypeInfos()

◆ GetNFields()

◆ GetNLogicalColumns()

◆ GetNPhysicalColumns()

◆ GetOnDiskFooterSize()

◆ GetOnDiskHeaderSize()

◆ GetOnDiskHeaderXxHash3()

◆ GetQualifiedFieldName()

◆ GetTopLevelFields() [1/2]

◆ GetTopLevelFields() [2/2]

◆ HasFeature()

◆ IncGeneration()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ operator==()

◆ PrintInfo()

Friends And Related Symbol Documentation

◆ Internal::RNTupleDescriptorBuilder

Member Data Documentation

◆ fClusterDescriptors

◆ fClusterGroupDescriptors

◆ fColumnDescriptors

◆ fDescription

◆ fExtraTypeInfoDescriptors

◆ fFeatureFlags

◆ fFieldDescriptors

◆ fFieldZeroId

◆ fGeneration

◆ fHeaderExtension

◆ fName

◆ fNClusters