RDataSource defines an API that RDataFrame can use to read arbitrary data formats.

A concrete RDataSource implementation (i.e. a class that inherits from RDataSource and implements all of its pure methods) provides an adaptor that RDataFrame can leverage to read any kind of tabular data formats. RDataFrame calls into RDataSource to retrieve information about the data, retrieve (thread-local) readers or "cursors" for selected columns and to advance the readers to the desired data entry.

The sequence of calls that RDataFrame (or any other client of a RDataSource) performs is the following:

SetNSlots() : inform RDataSource of the desired level of parallelism
GetColumnReaders() : retrieve from RDataSource per-thread readers for the desired columns
Initialize() : inform RDataSource that an event-loop is about to start
GetEntryRanges() : retrieve from RDataSource a set of ranges of entries that can be processed concurrently
InitSlot() : inform RDataSource that a certain thread is about to start working on a certain range of entries
SetEntry() : inform RDataSource that a certain thread is about to start working on a certain entry
FinalizeSlot() : inform RDataSource that a certain thread finished working on a certain range of entries
Finalize() : inform RDataSource that an event-loop finished

RDataSource implementations must support running multiple event-loops consecutively (although sequentially) on the same dataset.

SetNSlots() is called once per RDataSource object, typically when it is associated to a RDataFrame.
GetColumnReaders() can be called several times, potentially with the same arguments, also in-between event-loops, but not during an event-loop.
GetEntryRanges() will be called several times, including during an event loop, as additional ranges are needed. It will not be called concurrently.
Initialize() and Finalize() are called once per event-loop, right before starting and right after finishing.
InitSlot(), SetEntry(), and FinalizeSlot() can be called concurrently from multiple threads, multiple times per event-loop.

Advanced users that plan to implement a custom RDataSource can check out existing implementations, e.g. RCsvDS or RNTupleDS. See the inheritance diagram below for the full list of existing concrete implementations.

Definition at line 142 of file RDataSource.hxx.

Public Member Functions
	RDataSource ()=default

	RDataSource (const RDataSource &)=delete

	RDataSource (RDataSource &&)=delete

virtual	~RDataSource ()=default

virtual void	Finalize ()
	Convenience method called after concluding an event-loop.

virtual void	FinalizeSlot (unsigned int)
	Convenience method called at the end of the data processing associated to a slot.

virtual const std::vector< std::string > &	GetColumnNames () const =0
	Returns a reference to the collection of the dataset's column names.

template<typename T >
std::vector< T ** >	GetColumnReaders (std::string_view columnName)
	Called at most once per column by RDF.

virtual std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase >	GetColumnReaders (unsigned int, std::string_view, const std::type_info &)
	If the other GetColumnReaders overload returns an empty vector, this overload will be called instead.

virtual std::vector< std::pair< ULong64_t, ULong64_t > >	GetEntryRanges ()=0
	Return ranges of entries to distribute to tasks.

virtual std::string	GetLabel ()
	Return a string representation of the datasource type.

virtual std::size_t	GetNFiles () const
	Returns the number of files from which the dataset is constructed.

virtual std::string	GetTypeName (std::string_view colName) const =0
	Type of a column as a string, e.g.

virtual bool	HasColumn (std::string_view colName) const =0
	Checks if the dataset has a certain column.

virtual void	Initialize ()
	Convenience method called before starting an event-loop.

virtual void	InitSlot (unsigned int, ULong64_t)
	Convenience method called at the start of the data processing associated to a slot.

RDataSource &	operator= (const RDataSource &)=delete

RDataSource &	operator= (RDataSource &&)=delete

virtual bool	SetEntry (unsigned int slot, ULong64_t entry)=0
	Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot.

virtual void	SetGlobalEntryRange (std::pair< ULong64_t, ULong64_t > entryRange)
	Restrict processing to a [begin, end) range of entries.

virtual void	SetNSlots (unsigned int nSlots)
	Inform RDataSource of the number of processing slots (i.e.

Protected Types
using	Record_t = std::vector<void *>

Protected Member Functions
virtual std::string	AsString ()

virtual std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase >	CreateColumnReader (unsigned int slot, std::string_view col, const std::type_info &tid, TTreeReader *)
	Creates a column reader for the requested column.

virtual ROOT::RDF::RSampleInfo	CreateSampleInfo (unsigned int, const std::unordered_map< std::string, ROOT::RDF::Experimental::RSample * > &) const

virtual std::string	DescribeDataset ()

virtual const std::vector< std::string > &	GetColumnNamesNoDuplicates () const

virtual Record_t	GetColumnReadersImpl (std::string_view name, const std::type_info &)=0
	type-erased vector of pointers to pointers to column values - one per slot

virtual const std::vector< std::string > &	GetTopLevelFieldNames () const

virtual std::string	GetTypeNameWithOpts (std::string_view colName, bool) const

virtual void	InitializeWithOpts (const std::set< std::string > &)

virtual void	ProcessMT (ROOT::Detail::RDF::RLoopManager &)

virtual void	RunFinalChecks (bool) const

Protected Attributes
std::optional< std::pair< ULong64_t, ULong64_t > >	fGlobalEntryRange {}

unsigned int	fNSlots {}

Friends
void	ROOT::Internal::RDF::CallInitializeWithOpts (ROOT::RDF::RDataSource &, const std::set< std::string > &)

std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase >	ROOT::Internal::RDF::CreateColumnReader (ROOT::RDF::RDataSource &, unsigned int, std::string_view, const std::type_info &, TTreeReader *)

ROOT::RDF::RSampleInfo	ROOT::Internal::RDF::CreateSampleInfo (const ROOT::RDF::RDataSource &, unsigned int, const std::unordered_map< std::string, ROOT::RDF::Experimental::RSample * > &)

std::string	ROOT::Internal::RDF::DescribeDataset (ROOT::RDF::RDataSource &)

const std::vector< std::string > &	ROOT::Internal::RDF::GetColumnNamesNoDuplicates (const ROOT::RDF::RDataSource &)

const std::vector< std::string > &	ROOT::Internal::RDF::GetTopLevelFieldNames (const ROOT::RDF::RDataSource &)

std::string	ROOT::Internal::RDF::GetTypeNameWithOpts (const RDataSource &, std::string_view, bool)

void	ROOT::Internal::RDF::ProcessMT (RDataSource &, ROOT::Detail::RDF::RLoopManager &)

void	ROOT::Internal::RDF::RunFinalChecks (const ROOT::RDF::RDataSource &, bool)

#include <ROOT/RDataSource.hxx>

Inheritance diagram for ROOT::RDF::RDataSource:

[legend]

Member Typedef Documentation

◆ Record_t

using ROOT::RDF::RDataSource::Record_t = std::vector<void *>

protected

Definition at line 145 of file RDataSource.hxx.

Constructor & Destructor Documentation

◆ RDataSource() [1/3]

ROOT::RDF::RDataSource::RDataSource ( )

default

◆ RDataSource() [2/3]

ROOT::RDF::RDataSource::RDataSource ( const RDataSource & )

delete

◆ RDataSource() [3/3]

ROOT::RDF::RDataSource::RDataSource ( RDataSource && )

delete

◆ ~RDataSource()

virtual ROOT::RDF::RDataSource::~RDataSource ( )

virtualdefault

Member Function Documentation

◆ AsString()

virtual std::string ROOT::RDF::RDataSource::AsString ( )

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 148 of file RDataSource.hxx.

◆ CreateColumnReader()

virtual std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase > ROOT::RDF::RDataSource::CreateColumnReader	(	unsigned int	slot,
		std::string_view	col,
		const std::type_info &	tid,
		TTreeReader *	)

inlineprotectedvirtual

Creates a column reader for the requested column.

In the general case, this is just a redirect to the right GetColumnReaders overload. The signature notably also has a TTreeReader * parameter. This is currently necessary to still allow the TTree-based MT scheduling via TTreeProcessorMT. We use the TTreeProcessorMT::Process method to launch the same kernel across all threads. In each thread task, TTreeProcessorMT creates a thread-local instance of a TTreeReader which is going to read the range of events assigned to that task. That TTreeReader instance is what is passed to this method whenever a column reader needs to be created in a thread task. In the future this method might be removed by either allowing to request a handle to the thread-local TTreeReader instance programmatically from the TTreeProcessorMT, or refactoring the TTreeProcessorMT scheduling into RTTreeDS altogether.

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 198 of file RDataSource.hxx.

◆ CreateSampleInfo()

ROOT::RDF::RSampleInfo ROOT::RDF::RDataSource::CreateSampleInfo	(	unsigned int	,
		const std::unordered_map< std::string, ROOT::RDF::Experimental::RSample * > &	) const

protectedvirtual

Reimplemented in ROOT::RDF::RNTupleDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 11 of file RDataSource.cxx.

◆ DescribeDataset()

virtual std::string ROOT::RDF::RDataSource::DescribeDataset ( )

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 168 of file RDataSource.hxx.

◆ Finalize()

virtual void ROOT::RDF::RDataSource::Finalize ( )

inlinevirtual

Convenience method called after concluding an event-loop.

See Initialize for more details.

Reimplemented in ROOT::RDF::RCsvDS, ROOT::RDF::RNTupleDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 320 of file RDataSource.hxx.

◆ FinalizeSlot()

virtual void ROOT::RDF::RDataSource::FinalizeSlot ( unsigned int )

inlinevirtual

Convenience method called at the end of the data processing associated to a slot.

Parameters

[in] slot The data processing slot wihch needs to be finalized This method might be called multiple times per thread per event-loop.

Reimplemented in ROOT::RDF::RNTupleDS, and ROOT::Internal::RDF::RRootDS.

Definition at line 314 of file RDataSource.hxx.

◆ GetColumnNames()

virtual const std::vector< std::string > & ROOT::RDF::RDataSource::GetColumnNames ( ) const

pure virtual

Returns a reference to the collection of the dataset's column names.

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

◆ GetColumnNamesNoDuplicates()

virtual const std::vector< std::string > & ROOT::RDF::RDataSource::GetColumnNamesNoDuplicates ( ) const

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 162 of file RDataSource.hxx.

◆ GetColumnReaders() [1/2]

template<typename T >

std::vector< T ** > ROOT::RDF::RDataSource::GetColumnReaders ( std::string_view columnName )

inline

Called at most once per column by RDF.

Return vector of pointers to pointers to column values - one per slot.

Template Parameters

T	The type of the data stored in the column

Parameters

[in] columnName The name of the column

These pointers are veritable cursors: it's a responsibility of the RDataSource implementation that they point to the "right" memory region.

Definition at line 251 of file RDataSource.hxx.

◆ GetColumnReaders() [2/2]

virtual std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase > ROOT::RDF::RDataSource::GetColumnReaders	(	unsigned int	,
		std::string_view	,
		const std::type_info &	)

inlinevirtual

If the other GetColumnReaders overload returns an empty vector, this overload will be called instead.

Parameters

[in]	slot	The data processing slot that needs to be considered
[in]	name	The name of the column for which a column reader needs to be returned
[in]	tid	A type_info At least one of the two must return a non-empty/non-null value.

Reimplemented in ROOT::RDF::RNTupleDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 266 of file RDataSource.hxx.

◆ GetColumnReadersImpl()

virtual Record_t ROOT::RDF::RDataSource::GetColumnReadersImpl	(	std::string_view	name,
		const std::type_info &	)

protectedpure virtual

type-erased vector of pointers to pointers to column values - one per slot

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::Internal::RDF::RRootDS, and ROOT::Internal::RDF::RTTreeDS.

◆ GetEntryRanges()

virtual std::vector< std::pair< ULong64_t, ULong64_t > > ROOT::RDF::RDataSource::GetEntryRanges ( )

pure virtual

Return ranges of entries to distribute to tasks.

They are required to be contiguous intervals with no entries skipped. Supposing a dataset with nEntries, the intervals must start at 0 and end at nEntries, e.g. [0-5],[5-10] for 10 entries. This function will be invoked repeatedly by RDataFrame as it needs additional entries to process. The same entry range should not be returned more than once. Returning an empty collection of ranges signals to RDataFrame that the processing can stop.

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

◆ GetLabel()

virtual std::string ROOT::RDF::RDataSource::GetLabel ( )

inlinevirtual

Return a string representation of the datasource type.

The returned string will be used by ROOT::RDF::SaveGraph() to represent the datasource in the visualization of the computation graph. Concrete datasources can override the default implementation.

Reimplemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 326 of file RDataSource.hxx.

◆ GetNFiles()

virtual std::size_t ROOT::RDF::RDataSource::GetNFiles ( ) const

inlinevirtual

Returns the number of files from which the dataset is constructed.

Reimplemented in ROOT::RDF::RCsvDS, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 225 of file RDataSource.hxx.

◆ GetTopLevelFieldNames()

virtual const std::vector< std::string > & ROOT::RDF::RDataSource::GetTopLevelFieldNames ( ) const

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 158 of file RDataSource.hxx.

◆ GetTypeName()

virtual std::string ROOT::RDF::RDataSource::GetTypeName ( std::string_view colName ) const

pure virtual

Type of a column as a string, e.g.

GetTypeName("x") == "double". Required for jitting e.g. df.Filter("x>0").

Parameters

[in] colName The name of the column

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::Internal::RDF::RTTreeDS, and ROOT::RDF::RTrivialDS.

◆ GetTypeNameWithOpts()

virtual std::string ROOT::RDF::RDataSource::GetTypeNameWithOpts	(	std::string_view	colName,
		bool	) const

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 155 of file RDataSource.hxx.

◆ HasColumn()

virtual bool ROOT::RDF::RDataSource::HasColumn ( std::string_view colName ) const

pure virtual

Checks if the dataset has a certain column.

Parameters

[in] colName The name of the column

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

◆ Initialize()

virtual void ROOT::RDF::RDataSource::Initialize ( )

inlinevirtual

Convenience method called before starting an event-loop.

This method might be called multiple times over the lifetime of a RDataSource, since users can run multiple event-loops with the same RDataFrame. Ideally, Initialize should set the state of the RDataSource so that multiple identical event-loops will produce identical results.

Reimplemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RTTreeDS.

Definition at line 299 of file RDataSource.hxx.

◆ InitializeWithOpts()

virtual void ROOT::RDF::RDataSource::InitializeWithOpts ( const std::set< std::string > & )

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 165 of file RDataSource.hxx.

◆ InitSlot()

virtual void ROOT::RDF::RDataSource::InitSlot	(	unsigned int	,
		ULong64_t	)

inlinevirtual

Convenience method called at the start of the data processing associated to a slot.

Parameters

[in]	slot	The data processing slot wihch needs to be initialized
[in]	firstEntry	The first entry of the range that the task will process. This method might be called multiple times per thread per event-loop.

Reimplemented in ROOT::RDF::RArrowDS, ROOT::RDF::RNTupleDS, and ROOT::Internal::RDF::RRootDS.

Definition at line 307 of file RDataSource.hxx.

◆ operator=() [1/2]

RDataSource & ROOT::RDF::RDataSource::operator= ( const RDataSource & )

delete

◆ operator=() [2/2]

RDataSource & ROOT::RDF::RDataSource::operator= ( RDataSource && )

delete

◆ ProcessMT()

void ROOT::RDF::RDataSource::ProcessMT ( ROOT::Detail::RDF::RLoopManager & lm )

protectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 19 of file RDataSource.cxx.

◆ RunFinalChecks()

virtual void ROOT::RDF::RDataSource::RunFinalChecks ( bool ) const

inlineprotectedvirtual

Reimplemented in ROOT::Internal::RDF::RTTreeDS.

Definition at line 177 of file RDataSource.hxx.

◆ SetEntry()

virtual bool ROOT::RDF::RDataSource::SetEntry	(	unsigned int	slot,
		ULong64_t	entry )

pure virtual

Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot.

Parameters

[in]	slot	The data processing slot that needs to be considered
[in]	entry	The entry which needs to be pointed to by the reader pointers Slots are adopted to accommodate parallel data processing. Different workers will loop over different ranges and will be labelled by different "slot" values. Returns true if the entry has to be processed, false otherwise.

Implemented in ROOT::Internal::RDF::RVecDS< ColumnTypes >, ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, ROOT::Internal::RDF::RTTreeDS, and ROOT::RDF::RNTupleDS.

◆ SetGlobalEntryRange()

virtual void ROOT::RDF::RDataSource::SetGlobalEntryRange ( std::pair< ULong64_t, ULong64_t > entryRange )

inlinevirtual

Restrict processing to a [begin, end) range of entries.

Parameters

entryRange The range of entries to process.

Definition at line 330 of file RDataSource.hxx.

◆ SetNSlots()

virtual void ROOT::RDF::RDataSource::SetNSlots ( unsigned int nSlots )

inlinevirtual

Inform RDataSource of the number of processing slots (i.e.

worker threads) used by the associated RDataFrame. Slots numbers are used to simplify parallel execution: RDataFrame guarantees that different threads will always pass different slot values when calling methods concurrently.

Reimplemented in ROOT::RDF::RArrowDS, ROOT::RDF::RCsvDS, ROOT::RDF::RLazyDS< ColumnTypes >, ROOT::RDF::RNTupleDS, ROOT::Internal::RDF::RRootDS, ROOT::RDF::RSqliteDS, ROOT::RDF::RTrivialDS, and ROOT::Internal::RDF::RVecDS< ColumnTypes >.

Definition at line 217 of file RDataSource.hxx.

Friends And Related Symbol Documentation

◆ ROOT::Internal::RDF::CallInitializeWithOpts

void ROOT::Internal::RDF::CallInitializeWithOpts	(	ROOT::RDF::RDataSource &	,
		const std::set< std::string > &	)

friend

◆ ROOT::Internal::RDF::CreateColumnReader

std::unique_ptr< ROOT::Detail::RDF::RColumnReaderBase > ROOT::Internal::RDF::CreateColumnReader	(	ROOT::RDF::RDataSource &	,
		unsigned int	,
		std::string_view	,
		const std::type_info &	,
		TTreeReader *	)

friend

◆ ROOT::Internal::RDF::CreateSampleInfo

ROOT::RDF::RSampleInfo ROOT::Internal::RDF::CreateSampleInfo	(	const ROOT::RDF::RDataSource &	,
		unsigned int	,
		const std::unordered_map< std::string, ROOT::RDF::Experimental::RSample * > &	)

friend

◆ ROOT::Internal::RDF::DescribeDataset

std::string ROOT::Internal::RDF::DescribeDataset ( ROOT::RDF::RDataSource & )

friend

◆ ROOT::Internal::RDF::GetColumnNamesNoDuplicates

const std::vector< std::string > & ROOT::Internal::RDF::GetColumnNamesNoDuplicates ( const ROOT::RDF::RDataSource & )

friend

◆ ROOT::Internal::RDF::GetTopLevelFieldNames

const std::vector< std::string > & ROOT::Internal::RDF::GetTopLevelFieldNames ( const ROOT::RDF::RDataSource & )

friend

◆ ROOT::Internal::RDF::GetTypeNameWithOpts

std::string ROOT::Internal::RDF::GetTypeNameWithOpts	(	const RDataSource &	,
		std::string_view	,
		bool	)

friend

◆ ROOT::Internal::RDF::ProcessMT

void ROOT::Internal::RDF::ProcessMT	(	RDataSource &	,
		ROOT::Detail::RDF::RLoopManager &	)

friend

◆ ROOT::Internal::RDF::RunFinalChecks

void ROOT::Internal::RDF::RunFinalChecks	(	const ROOT::RDF::RDataSource &	,
		bool	)

friend

Member Data Documentation

◆ fGlobalEntryRange

std::optional<std::pair<ULong64_t, ULong64_t> > ROOT::RDF::RDataSource::fGlobalEntryRange {}

protected

Definition at line 152 of file RDataSource.hxx.

◆ fNSlots

unsigned int ROOT::RDF::RDataSource::fNSlots {}

protected

Definition at line 150 of file RDataSource.hxx.

Libraries for ROOT::RDF::RDataSource:

[legend]

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

tree/dataframe/inc/ROOT/RDataSource.hxx
tree/dataframe/src/RDataSource.cxx

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Friends

Member Typedef Documentation

◆ Record_t

Constructor & Destructor Documentation

◆ RDataSource() [1/3]

◆ RDataSource() [2/3]

◆ RDataSource() [3/3]

◆ ~RDataSource()

Member Function Documentation

◆ AsString()

◆ CreateColumnReader()

◆ CreateSampleInfo()

◆ DescribeDataset()

◆ Finalize()

◆ FinalizeSlot()

◆ GetColumnNames()

◆ GetColumnNamesNoDuplicates()

◆ GetColumnReaders() [1/2]

◆ GetColumnReaders() [2/2]

◆ GetColumnReadersImpl()

◆ GetEntryRanges()

◆ GetLabel()

◆ GetNFiles()

◆ GetTopLevelFieldNames()

◆ GetTypeName()

◆ GetTypeNameWithOpts()

◆ HasColumn()

◆ Initialize()

◆ InitializeWithOpts()

◆ InitSlot()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ ProcessMT()

◆ RunFinalChecks()

◆ SetEntry()

◆ SetGlobalEntryRange()

◆ SetNSlots()

Friends And Related Symbol Documentation

◆ ROOT::Internal::RDF::CallInitializeWithOpts

◆ ROOT::Internal::RDF::CreateColumnReader

◆ ROOT::Internal::RDF::CreateSampleInfo

◆ ROOT::Internal::RDF::DescribeDataset

◆ ROOT::Internal::RDF::GetColumnNamesNoDuplicates

◆ ROOT::Internal::RDF::GetTopLevelFieldNames

◆ ROOT::Internal::RDF::GetTypeNameWithOpts

◆ ROOT::Internal::RDF::ProcessMT

◆ ROOT::Internal::RDF::RunFinalChecks

Member Data Documentation

◆ fGlobalEntryRange

◆ fNSlots