ROOT::Experimental::Internal::RNTupleMerger Class Reference

Given a set of RPageSources merge them into an RPageSink, optionally changing their compression.

This can also be used to change the compression of a single RNTuple by just passing a single source.

Definition at line 49 of file RNTupleMerger.hxx.

Classes
struct	RColumnInfo

Public Member Functions
void	Merge (std::span< RPageSource * > sources, RPageSink &destination, const RNTupleMergeOptions &options=RNTupleMergeOptions())
	Merge a given set of sources into the destination.

Private Member Functions
void	AddColumnsFromField (std::vector< RColumnInfo > &columns, const RNTupleDescriptor &desc, const RFieldDescriptor &fieldDesc, const std::string &prefix="")
	Recursively add columns from a given field.
void	BuildColumnIdMap (std::vector< RColumnInfo > &columns)
	Build the internal column id map from the first source This is where we assign the output ids for the first source.
void	CollectColumns (const RNTupleDescriptor &descriptor, std::vector< RColumnInfo > &columns)
	Recursively collect all the columns for all the fields rooted at field zero.
void	ValidateColumns (std::vector< RColumnInfo > &columns)
	Validate the columns against the internal map that is built from the first source This is where we assign the output ids for the remaining sources.

Private Attributes
std::unordered_map< std::string, DescriptorId_t >	fOutputIdMap

#include <ROOT/RNTupleMerger.hxx>

Member Function Documentation

AddColumnsFromField()

void ROOT::Experimental::Internal::RNTupleMerger::AddColumnsFromField ( std::vector< RColumnInfo > &  columns, const RNTupleDescriptor &  desc, const RFieldDescriptor &  fieldDesc, const std::string &  prefix = ""  )

private

Recursively add columns from a given field.

Definition at line 164 of file RNTupleMerger.cxx.

BuildColumnIdMap()

void ROOT::Experimental::Internal::RNTupleMerger::BuildColumnIdMap ( std::vector< RColumnInfo > &  columns )

private

Build the internal column id map from the first source This is where we assign the output ids for the first source.

Definition at line 120 of file RNTupleMerger.cxx.

CollectColumns()

void ROOT::Experimental::Internal::RNTupleMerger::CollectColumns ( const RNTupleDescriptor &  descriptor, std::vector< RColumnInfo > &  columns  )

private

Recursively collect all the columns for all the fields rooted at field zero.

Definition at line 149 of file RNTupleMerger.cxx.

Merge()

void ROOT::Experimental::Internal::RNTupleMerger::Merge	(	std::span< RPageSource * >	sources,
		RPageSink &	destination,
		const RNTupleMergeOptions &	options = RNTupleMergeOptions()
	)

Merge a given set of sources into the destination.

Definition at line 183 of file RNTupleMerger.cxx.

ValidateColumns()

void ROOT::Experimental::Internal::RNTupleMerger::ValidateColumns ( std::vector< RColumnInfo > &  columns )

private

Validate the columns against the internal map that is built from the first source This is where we assign the output ids for the remaining sources.

Definition at line 130 of file RNTupleMerger.cxx.

Member Data Documentation

fOutputIdMap

std::unordered_map<std::string, DescriptorId_t> ROOT::Experimental::Internal::RNTupleMerger::fOutputIdMap

private

Definition at line 82 of file RNTupleMerger.hxx.

Libraries for ROOT::Experimental::Internal::RNTupleMerger:

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

• tree/ntuple/v7/inc/ROOT/RNTupleMerger.hxx
• tree/ntuple/v7/src/RNTupleMerger.cxx