casacore::TableExprGroupNull Class Reference

Class derived from TableExprGroupFuncBase representing a no function. More...

#include <ExprGroup.h>

Public Member Functions
	TableExprGroupNull (TableExprNodeRep *node)
virtual	~TableExprGroupNull ()
virtual Bool	isLazy () const
	Does the aggregate function use lazy semantics? The default implementation returns False.
virtual void	apply (const TableExprId &id)
	Get the operand's value for the given row and apply it to the aggregation.
Public Member Functions inherited from casacore::TableExprGroupFuncBase
	TableExprGroupFuncBase (TableExprNodeRep *node)
	Construct from the TaQL aggregation node.
virtual	~TableExprGroupFuncBase ()
	TableExprGroupFuncBase (const TableExprGroupFuncBase &)=delete
	Copying is not needed, thus not allowed.
TableExprGroupFuncBase &	operator= (const TableExprGroupFuncBase &)=delete
uInt	seqnr () const
	Get the function's sequence nr.
void	setSeqnr (uInt seqnr)
	Set the function's sequence nr.
virtual void	finish ()
	If needed, finish the aggregation.
virtual std::shared_ptr< vector< TableExprId > >	getIds () const
	Get the assembled TableExprIds of a group.
virtual Bool	getBool (const vector< TableExprId > &=vector< TableExprId >())
	Get the aggregated value.
virtual Int64	getInt (const vector< TableExprId > &=vector< TableExprId >())
virtual Double	getDouble (const vector< TableExprId > &=vector< TableExprId >())
virtual DComplex	getDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MVTime	getDate (const vector< TableExprId > &=vector< TableExprId >())
virtual String	getString (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Bool >	getArrayBool (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Int64 >	getArrayInt (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Double >	getArrayDouble (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< DComplex >	getArrayDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< MVTime >	getArrayDate (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< String >	getArrayString (const vector< TableExprId > &=vector< TableExprId >())

Additional Inherited Members
Protected Attributes inherited from casacore::TableExprGroupFuncBase
TableExprNodeRep *	itsNode
TableExprNodeRep *	itsOperand
uInt	itsSeqnr

Detailed Description

Class derived from TableExprGroupFuncBase representing a no function.

Intended use:

Internal

Review Status

Test programs:

tExprGroup

Synopsis

This class represents a null aggregate function which is meant for possible aggregate functionality in UDFs.

Definition at line 263 of file ExprGroup.h.

Constructor & Destructor Documentation

TableExprGroupNull()

casacore::TableExprGroupNull::TableExprGroupNull ( TableExprNodeRep *  node )

explicit

~TableExprGroupNull()

virtual casacore::TableExprGroupNull::~TableExprGroupNull ( )

virtual

Member Function Documentation

apply()

virtual void casacore::TableExprGroupNull::apply ( const TableExprId &  id )

virtual

Get the operand's value for the given row and apply it to the aggregation.

This function should not be called for lazy classes.

Implements casacore::TableExprGroupFuncBase.

isLazy()

virtual Bool casacore::TableExprGroupNull::isLazy ( ) const

virtual

Does the aggregate function use lazy semantics? The default implementation returns False.

Reimplemented from casacore::TableExprGroupFuncBase.

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

• tables/TaQL/ExprGroup.h