ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping Class Reference

Provides a mapping from one or several join field values to an entry index.

Definition at line 50 of file RNTupleJoinTable.hxx.

Classes
struct	RCombinedJoinFieldValue
	Container for the combined hashes of join field values. More...
struct	RCombinedJoinFieldValueHash
	Hash combining the individual join field value hashes from RCombinedJoinFieldValue. More...

Public Member Functions
	REntryMapping (RPageSource &pageSource, const std::vector< std::string > &joinFieldNames)
	Create a new entry mapping.
const std::vector< ROOT::NTupleSize_t > *	GetEntryIndexes (std::vector< void * > valuePtrs) const
	Get the entry indexes for this entry mapping.

Private Attributes
std::vector< std::string >	fJoinFieldNames
	Names of the join fields used for the mapping to their respective entry indexes.
std::vector< std::size_t >	fJoinFieldValueSizes
	The size (in bytes) for each join field, corresponding to fJoinFieldNames.
std::unordered_map< RCombinedJoinFieldValue, std::vector< ROOT::NTupleSize_t >, RCombinedJoinFieldValueHash >	fMapping
	The mapping itself.

Constructor & Destructor Documentation

REntryMapping()

ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping::REntryMapping	(	RPageSource &	pageSource,
		const std::vector< std::string > &	joinFieldNames )

Create a new entry mapping.

Parameters

[in]	pageSource	The page source of the RNTuple with the entries to map.
[in]	joinFieldNames	Names of the join fields to use in the mapping.

Definition at line 35 of file RNTupleJoinTable.cxx.

Member Function Documentation

GetEntryIndexes()

const std::vector< ROOT::NTupleSize_t > * ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping::GetEntryIndexes

(

std::vector< void * >

valuePtrs

)

const

Get the entry indexes for this entry mapping.

Definition at line 90 of file RNTupleJoinTable.cxx.

Member Data Documentation

fJoinFieldNames

std::vector<std::string> ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping::fJoinFieldNames

private

Names of the join fields used for the mapping to their respective entry indexes.

Definition at line 86 of file RNTupleJoinTable.hxx.

fJoinFieldValueSizes

std::vector<std::size_t> ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping::fJoinFieldValueSizes

private

The size (in bytes) for each join field, corresponding to fJoinFieldNames.

This information is stored to be able to properly cast incoming void pointers to the join field values in GetEntryIndexes.

Definition at line 90 of file RNTupleJoinTable.hxx.

fMapping

std::unordered_map<RCombinedJoinFieldValue, std::vector<ROOT::NTupleSize_t>, RCombinedJoinFieldValueHash> ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping::fMapping

private

The mapping itself.

Maps field values (or combinations thereof in case the join key is composed of multiple fields) to their respective entry numbers.

Definition at line 83 of file RNTupleJoinTable.hxx.

Libraries for ROOT::Experimental::Internal::RNTupleJoinTable::REntryMapping:

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

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