A platform for high-performance distributed tool and library development written in C++. It can be deployed in two different cluster modes: standalone or distributed. API for v0.5.0, released on June 13, 2018.
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pdb::EqualsLambda< LeftType, RightType > Class Template Reference

#include <EqualsLambda.h>

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Public Member Functions

 EqualsLambda (LambdaTree< LeftType > lhsIn, LambdaTree< RightType > rhsIn)
 
std::string getTypeOfLambda () override
 
std::string toTCAPString (std::vector< std::string > &inputTupleSetNames, std::vector< std::string > &inputColumnNames, std::vector< std::string > &inputColumnsToApply, std::vector< std::string > &childrenLambdaNames, int lambdaLabel, std::string computationName, int computationLabel, std::string &outputTupleSetName, std::vector< std::string > &outputColumns, std::string &outputColumnName, std::string &myLambdaName, MultiInputsBase *multiInputsComp=nullptr, bool amIPartOfJoinPredicate=false, bool amILeftChildOfEqualLambda=false, bool amIRightChildOfEqualLambda=false, std::string parentLambdaName="", bool isSelfJoin=false) override
 
std::map< std::string,
std::string > 		getInfo () override
 
unsigned int getNumInputs () override
 
int getNumChildren () override
 
GenericLambdaObjectPtr getChild (int which) override
 
ComputeExecutorPtr getExecutor (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput) override
 
ComputeExecutorPtr getRightHasher (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput) override
 
ComputeExecutorPtr getLeftHasher (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput) override
 
- Public Member Functions inherited from pdb::TypedLambdaObject< bool >
virtual ~TypedLambdaObject ()=default
 
std::string getOutputType () override
 
- Public Member Functions inherited from pdb::GenericLambdaObject
virtual ~GenericLambdaObject ()=default
 
void setInputIndex (int i, unsigned int index)
 
virtual unsigned int getInputIndex (int i)
 
virtual ComputeExecutorPtr getExecutor (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput, ComputeInfoPtr)
 
virtual ComputeExecutorPtr getLeftHasher (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput, ComputeInfoPtr)
 
virtual ComputeExecutorPtr getRightHasher (TupleSpec &inputSchema, TupleSpec &attsToOperateOn, TupleSpec &attsToIncludeInOutput, ComputeInfoPtr)
 
std::string getTCAPString (const std::string &inputTupleSetName, const std::vector< std::string > &inputColumnNames, const std::vector< std::string > &inputColumnsToApply, const std::string &outputTupleSetName, const std::vector< std::string > &outputColumns, const std::string &outputColumnName, const std::string &tcapOperation, const std::string &computationNameAndLabel, const std::string &lambdaNameAndLabel, const std::map< std::string, std::string > &info)
 
virtual std::string toTCAPStringForCartesianJoin (int lambdaLabel, std::string computationName, int computationLabel, std::string &outputTupleSetName, std::vector< std::string > &outputColumns, std::string &outputColumnName, std::string &myLambdaName, MultiInputsBase *multiInputsComp)
 

Public Attributes

LambdaTree< LeftType > lhs
 
LambdaTree< RightType > rhs
 

Detailed Description

template<class LeftType, class RightType>
class pdb::EqualsLambda< LeftType, RightType >

Definition at line 83 of file EqualsLambda.h.

Constructor & Destructor Documentation

template<class LeftType , class RightType >
pdb::EqualsLambda< LeftType, RightType >::EqualsLambda ( LambdaTree< LeftType >  lhsIn,
LambdaTree< RightType >  rhsIn 
)
inline

Definition at line 90 of file EqualsLambda.h.

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Member Function Documentation

template<class LeftType , class RightType >
GenericLambdaObjectPtr pdb::EqualsLambda< LeftType, RightType >::getChild ( int  which)
inlineoverridevirtual

gets a particular child of this Lambda

Parameters
which- // TODO missing description
Returns
- // TODO missing description

Implements pdb::GenericLambdaObject.

Definition at line 341 of file EqualsLambda.h.

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template<class LeftType , class RightType >
ComputeExecutorPtr pdb::EqualsLambda< LeftType, RightType >::getExecutor ( TupleSpec &  inputSchema,
TupleSpec &  attsToOperateOn,
TupleSpec &  attsToIncludeInOutput 
)
inlineoverridevirtual

Used this gets an executor that appends the result of running this lambda to the end of each tuple

Parameters
inputSchema- // TODO missing description
attsToOperateOn- // TODO missing description
attsToIncludeInOutput- // TODO missing description
Returns
- // TODO missing description

Implements pdb::GenericLambdaObject.

Definition at line 359 of file EqualsLambda.h.

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template<class LeftType , class RightType >
std::map<std::string, std::string> pdb::EqualsLambda< LeftType, RightType >::getInfo ( )
inlineoverridevirtual

Returns the additional information about this lambda currently just the lambda type

Returns
the map

Implements pdb::GenericLambdaObject.

Definition at line 325 of file EqualsLambda.h.

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template<class LeftType , class RightType >
ComputeExecutorPtr pdb::EqualsLambda< LeftType, RightType >::getLeftHasher ( TupleSpec &  inputSchema,
TupleSpec &  attsToOperateOn,
TupleSpec &  attsToIncludeInOutput 
)
inlineoverridevirtual

This gets an executor that appends a hash value to the end of each tuple; implemented, for example, by ==

Parameters
inputSchema
attsToOperateOn
attsToIncludeInOutput
Returns
- // TODO missing description

Reimplemented from pdb::GenericLambdaObject.

Definition at line 466 of file EqualsLambda.h.

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template<class LeftType , class RightType >
int pdb::EqualsLambda< LeftType, RightType >::getNumChildren ( )
inlineoverridevirtual

one big technical problem is that when tuples are added to a hash table to be recovered at a later time, we we break a pipeline. The difficulty with this is that when we want to probe a hash table to find a set of hash values, we can't use the input TupleSet as a way to create the columns to store the result of the probe. The hash table needs to be able to create (from scratch) the columns that store the output. This is a problem, because the hash table has no information about the types of the objects that it contains. The way around this is that we have a function attached to each GenericLambdaObject that allows us to ask the GenericLambdaObject to try to add a column to a tuple set, of a specific type, where the type name is specified as a string. When the hash table needs to create an output TupleSet, it can ask all of the GenericLambdaObjects associated with a query to create the necessary columns, as a way to build up the output TupleSet. This method is how the hash table can ask for this. It takes tree args: the type of the column that the hash table wants the tuple set to build, the tuple set to add the column to, and the position where the column will be added. If the GenericLambdaObject cannot build the column (it has no knowledge of that type) a false is returned. Otherwise, a true is returned. virtual bool addColumnToTupleSet (std :: string &typeToMatch, TupleSetPtr addToMe, int posToAddTo) = 0; returns the number of children of this Lambda type

Returns
- // TODO missing description

Implements pdb::GenericLambdaObject.

Definition at line 337 of file EqualsLambda.h.

template<class LeftType , class RightType >
unsigned int pdb::EqualsLambda< LeftType, RightType >::getNumInputs ( )
inlineoverridevirtual

Used to get number of inputs to this Lambda

Returns
- the number of inputs

Implements pdb::GenericLambdaObject.

Definition at line 333 of file EqualsLambda.h.

template<class LeftType , class RightType >
ComputeExecutorPtr pdb::EqualsLambda< LeftType, RightType >::getRightHasher ( TupleSpec &  inputSchema,
TupleSpec &  attsToOperateOn,
TupleSpec &  attsToIncludeInOutput 
)
inlineoverridevirtual

This gets an executor that appends a hash value to the end of each tuple; implemented, for example, by ==

Parameters
inputSchema- // TODO add proper description of this parameter
attsToOperateOn- // TODO add proper description of this parameter
attsToIncludeInOutput- // TODO add proper description of this parameter
Returns
- // TODO add proper description of this return value

Reimplemented from pdb::GenericLambdaObject.

Definition at line 415 of file EqualsLambda.h.

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template<class LeftType , class RightType >
std::string pdb::EqualsLambda< LeftType, RightType >::getTypeOfLambda ( )
inlineoverridevirtual

returns the name of this LambdaBase type, as a string

Returns
- // TODO missing description

Implements pdb::GenericLambdaObject.

Definition at line 99 of file EqualsLambda.h.

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template<class LeftType , class RightType >
std::string pdb::EqualsLambda< LeftType, RightType >::toTCAPString ( std::vector< std::string > &  inputTupleSetNames,
std::vector< std::string > &  inputColumnNames,
std::vector< std::string > &  inputColumnsToApply,
std::vector< std::string > &  childrenLambdaNames,
int  lambdaLabel,
std::string  computationName,
int  computationLabel,
std::string &  outputTupleSetName,
std::vector< std::string > &  outputColumns,
std::string &  outputColumnName,
std::string &  myLambdaName,
MultiInputsBase *  multiInputsComp = nullptr,
bool  amIPartOfJoinPredicate = false,
bool  amILeftChildOfEqualLambda = false,
bool  amIRightChildOfEqualLambda = false,
std::string  parentLambdaName = "",
bool  isSelfJoin = false 
)
inlineoverridevirtual

This gets TCAP string corresponding to this Lambda JiaNote: below is just a default implementation for Lambdas to "Apply" you can override this implementation in your subclasses

// TODO this method has been glued and tied together multiple times and should be completely rewritten and refactored

Parameters
inputTupleSetNames- // TODO add proper descriptions of the parameter
inputColumnNames- // TODO add proper descriptions of the parameter
inputColumnsToApply- // TODO add proper descriptions of the parameter
childrenLambdaNames- // TODO add proper descriptions of the parameter
lambdaLabel- // TODO add proper descriptions of the parameter
computationName- // TODO add proper descriptions of the parameter
computationLabel- // TODO add proper descriptions of the parameter
outputTupleSetName- // TODO add proper descriptions of the parameter
outputColumns- // TODO add proper descriptions of the parameter
outputColumnName- // TODO add proper descriptions of the parameter
myLambdaName- // TODO add proper descriptions of the parameter
multiInputsComp- // TODO add proper descriptions of the parameter
amIPartOfJoinPredicate- // TODO add proper descriptions of the parameter
amILeftChildOfEqualLambda- // TODO add proper descriptions of the parameter
amIRightChildOfEqualLambda- // TODO add proper descriptions of the parameter
parentLambdaName- // TODO add proper descriptions of the parameter
isSelfJoin- // TODO add proper descriptions of the parameter
Returns
- // TODO add proper descriptions of the return value

Reimplemented from pdb::GenericLambdaObject.

Definition at line 103 of file EqualsLambda.h.

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Member Data Documentation

template<class LeftType , class RightType >
LambdaTree<LeftType> pdb::EqualsLambda< LeftType, RightType >::lhs

Definition at line 86 of file EqualsLambda.h.

template<class LeftType , class RightType >
LambdaTree<RightType> pdb::EqualsLambda< LeftType, RightType >::rhs

Definition at line 87 of file EqualsLambda.h.

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