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

Given a set of RPageSources merge them into an RPagePersistentSink, 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 111 of file RNTupleMerger.hxx.

Public Member Functions
	RNTupleMerger (std::unique_ptr< ROOT::Internal::RPagePersistentSink > destination)
	Creates a RNTupleMerger with the given destination.
RResult< void >	Merge (std::span< ROOT::Internal::RPageSource * > sources, const RNTupleMergeOptions &mergeOpts=RNTupleMergeOptions())
	Merge a given set of sources into the destination.

Private Member Functions
	RNTupleMerger (std::unique_ptr< ROOT::Internal::RPagePersistentSink > destination, std::unique_ptr< ROOT::RNTupleModel > model)
	Creates a RNTupleMerger with the given destination.
ROOT::RResult< void >	MergeCommonColumns (ROOT::Internal::RClusterPool &clusterPool, const ROOT::RClusterDescriptor &clusterDesc, std::span< RColumnMergeInfo > commonColumns, const ROOT::Internal::RCluster::ColumnSet_t &commonColumnSet, RSealedPageMergeData &sealedPageData, const RNTupleMergeData &mergeData, ROOT::Internal::RPageAllocator &pageAlloc)
ROOT::RResult< void >	MergeSourceClusters (ROOT::Internal::RPageSource &source, std::span< RColumnMergeInfo > commonColumns, std::span< const RColumnMergeInfo > extraDstColumns, RNTupleMergeData &mergeData)

Private Attributes
std::unique_ptr< ROOT::Internal::RPagePersistentSink >	fDestination
std::unique_ptr< ROOT::RNTupleModel >	fModel
std::unique_ptr< ROOT::Internal::RPageAllocator >	fPageAlloc
std::optional< TTaskGroup >	fTaskGroup

Friends
class	ROOT::RNTuple

#include <ROOT/RNTupleMerger.hxx>

Constructor & Destructor Documentation

RNTupleMerger() [1/2]

RNTupleMerger::RNTupleMerger ( std::unique_ptr< ROOT::Internal::RPagePersistentSink > destination, std::unique_ptr< ROOT::RNTupleModel > model )

private

Creates a RNTupleMerger with the given destination.

The model must be given if and only if destination has been initialized with that model (i.e. in case of incremental merging).

Definition at line 1323 of file RNTupleMerger.cxx.

RNTupleMerger() [2/2]

RNTupleMerger::RNTupleMerger ( std::unique_ptr< ROOT::Internal::RPagePersistentSink > destination )

explicit

Creates a RNTupleMerger with the given destination.

Definition at line 1339 of file RNTupleMerger.cxx.

Member Function Documentation

Merge()

ROOT::RResult< void > RNTupleMerger::Merge	(	std::span< ROOT::Internal::RPageSource * >	sources,
		const RNTupleMergeOptions &	mergeOpts = RNTupleMergeOptions() )

Merge a given set of sources into the destination.

Note that sources with an empty schema (i.e. created from a Model that had no fields added to it) are in general valid (depending on the merging mode) but add no entries to the destination.

Definition at line 1344 of file RNTupleMerger.cxx.

MergeCommonColumns()

ROOT::RResult< void > RNTupleMerger::MergeCommonColumns ( ROOT::Internal::RClusterPool & clusterPool, const ROOT::RClusterDescriptor & clusterDesc, std::span< RColumnMergeInfo > commonColumns, const ROOT::Internal::RCluster::ColumnSet_t & commonColumnSet, RSealedPageMergeData & sealedPageData, const RNTupleMergeData & mergeData, ROOT::Internal::RPageAllocator & pageAlloc )

private

Definition at line 894 of file RNTupleMerger.cxx.

MergeSourceClusters()

ROOT::RResult< void > RNTupleMerger::MergeSourceClusters ( ROOT::Internal::RPageSource & source, std::span< RColumnMergeInfo > commonColumns, std::span< const RColumnMergeInfo > extraDstColumns, RNTupleMergeData & mergeData )

private

Definition at line 1031 of file RNTupleMerger.cxx.

Friends And Related Symbol Documentation

ROOT::RNTuple

friend class ROOT::RNTuple

friend

Definition at line 112 of file RNTupleMerger.hxx.

Member Data Documentation

fDestination

std::unique_ptr<ROOT::Internal::RPagePersistentSink> ROOT::Experimental::Internal::RNTupleMerger::fDestination

private

Definition at line 114 of file RNTupleMerger.hxx.

fModel

std::unique_ptr<ROOT::RNTupleModel> ROOT::Experimental::Internal::RNTupleMerger::fModel

private

Definition at line 117 of file RNTupleMerger.hxx.

fPageAlloc

std::unique_ptr<ROOT::Internal::RPageAllocator> ROOT::Experimental::Internal::RNTupleMerger::fPageAlloc

private

Definition at line 115 of file RNTupleMerger.hxx.

fTaskGroup

std::optional<TTaskGroup> ROOT::Experimental::Internal::RNTupleMerger::fTaskGroup

private

Definition at line 116 of file RNTupleMerger.hxx.

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

---

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

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