TaQL node representing a scalar aggregate function. More...

#include <ExprAggrNode.h>

Inheritance diagram for casacore::TableExprAggrNode:

Public Member Functions
	TableExprAggrNode (FunctionType, NodeDataType, ValueType, const TableExprNodeSet &source, const vector< TENShPtr > &nodes, const Block< Int > &dtypeOper)
	Constructor. More...

virtual void	getAggrNodes (std::vector< TableExprNodeRep * > &aggr)
	Get the nodes representing an aggregate function. More...

TENShPtr	operand ()
	Get the operand node. More...

virtual CountedPtr < TableExprGroupFuncBase >	makeGroupAggrFunc ()
	Create the correct aggregate function object. More...

virtual Bool	isLazyAggregate () const
	Is the aggregate function a lazy or an immediate one? More...

virtual Bool	getBool (const TableExprId &id)
	Functions to get the result of an aggregate function. More...

virtual Int64	getInt (const TableExprId &id)

virtual Double	getDouble (const TableExprId &id)

virtual DComplex	getDComplex (const TableExprId &id)

virtual String	getString (const TableExprId &id)

virtual MVTime	getDate (const TableExprId &id)

Public Member Functions inherited from casacore::TableExprFuncNode
	TableExprFuncNode (FunctionType, NodeDataType, ValueType, const TableExprNodeSet &source, const vector< TENShPtr > &nodes, const Block< Int > &dtypeOper, const Table &=Table())
	Constructor. More...

	~TableExprFuncNode ()
	Destructor. More...

Bool	getBool (const TableExprId &id)
	'get' Functions to get the desired result of a function More...

Int64	getInt (const TableExprId &id)

Double	getDouble (const TableExprId &id)

DComplex	getDComplex (const TableExprId &id)

String	getString (const TableExprId &id)

TaqlRegex	getRegex (const TableExprId &id)

MVTime	getDate (const TableExprId &id)

void	fillUnits ()
	Fill the result unit in the node. More...

void	fillChildNodes (const vector< TENShPtr > &nodes, const Block< Int > &dtypeOper)
	Link the children to the node and convert the children to constants if possible. More...

Double	getScale () const
	Get possible unit scale factor (needed for sqrt). More...

const std::vector< TENShPtr > &	operands () const
	Some functions to be used by TableExprNodeFuncArray. More...

std::vector< TENShPtr > &	rwOperands ()

FunctionType	funcType () const

NodeDataType	argDataType () const

Public Member Functions inherited from casacore::TableExprNodeMulti
	TableExprNodeMulti (NodeDataType, ValueType, OperType, const TableExprNodeRep &source)
	Constructor. More...

virtual	~TableExprNodeMulti ()
	Destructor. More...

virtual void	show (ostream &, uInt indent) const
	Show the expression tree. More...

virtual void	getColumnNodes (std::vector< TableExprNodeRep * > &cols)
	Get the nodes representing a table column. More...

const std::vector< TENShPtr > &	getChildren () const
	Get the child nodes. More...

Public Member Functions inherited from casacore::TableExprNodeRep
	TableExprNodeRep (NodeDataType, ValueType, OperType, ArgType, ExprType, Int ndim, const IPosition &shape, const Table &table)
	Construct a node. More...

	TableExprNodeRep (NodeDataType, ValueType, OperType, const Table &)
	This constructor is called from the derived TableExprNodeRep. More...

	TableExprNodeRep (const TableExprNodeRep &)
	Copy constructor. More...

virtual	~TableExprNodeRep ()
	The destructor deletes all the underlying TableExprNode objects. More...

virtual void	disableApplySelection ()
	Do not apply the selection. More...

virtual void	applySelection (const Vector< rownr_t > &rownrs)
	Re-create the column object for a selection of rows. More...

virtual Double	getUnitFactor () const
	Get the unit conversion factor. More...

void	checkAggrFuncs ()
	Throw an exception if an aggregate function is used in the expression node or its children. More...

virtual MArray< Bool >	getArrayBool (const TableExprId &id)
	Get an array value for this node in the given row. More...

virtual MArray< Int64 >	getArrayInt (const TableExprId &id)

virtual MArray< Double >	getArrayDouble (const TableExprId &id)

virtual MArray< DComplex >	getArrayDComplex (const TableExprId &id)

virtual MArray< String >	getArrayString (const TableExprId &id)

virtual MArray< MVTime >	getArrayDate (const TableExprId &id)

void	get (const TableExprId &id, Bool &value)
	General get functions for template purposes. More...

void	get (const TableExprId &id, Int64 &value)

void	get (const TableExprId &id, Double &value)

void	get (const TableExprId &id, DComplex &value)

void	get (const TableExprId &id, MVTime &value)

void	get (const TableExprId &id, String &value)

void	get (const TableExprId &id, MArray< Bool > &value)

void	get (const TableExprId &id, MArray< Int64 > &value)

void	get (const TableExprId &id, MArray< Double > &value)

void	get (const TableExprId &id, MArray< DComplex > &value)

void	get (const TableExprId &id, MArray< MVTime > &value)

void	get (const TableExprId &id, MArray< String > &value)

MArray< Bool >	getBoolAS (const TableExprId &id)
	Get a value as an array, even it it is a scalar. More...

MArray< Int64 >	getIntAS (const TableExprId &id)

MArray< Double >	getDoubleAS (const TableExprId &id)

MArray< DComplex >	getDComplexAS (const TableExprId &id)

MArray< String >	getStringAS (const TableExprId &id)

MArray< MVTime >	getDateAS (const TableExprId &id)

virtual Bool	hasBool (const TableExprId &id, Bool value)
	Does a value occur in an array or set? The default implementation tests if it is in an array. More...

virtual Bool	hasInt (const TableExprId &id, Int64 value)

virtual Bool	hasDouble (const TableExprId &id, Double value)

virtual Bool	hasDComplex (const TableExprId &id, const DComplex &value)

virtual Bool	hasString (const TableExprId &id, const String &value)

virtual Bool	hasDate (const TableExprId &id, const MVTime &value)

virtual MArray< Bool >	hasArrayBool (const TableExprId &id, const MArray< Bool > &value)

virtual MArray< Bool >	hasArrayInt (const TableExprId &id, const MArray< Int64 > &value)

virtual MArray< Bool >	hasArrayDouble (const TableExprId &id, const MArray< Double > &value)

virtual MArray< Bool >	hasArrayDComplex (const TableExprId &id, const MArray< DComplex > &value)

virtual MArray< Bool >	hasArrayString (const TableExprId &id, const MArray< String > &value)

virtual MArray< Bool >	hasArrayDate (const TableExprId &id, const MArray< MVTime > &value)

rownr_t	nrow () const
	Get the number of rows in the table associated with this expression. More...

virtual Bool	getColumnDataType (DataType &) const
	Get the data type of the column. More...

virtual Array< Bool >	getColumnBool (const Vector< rownr_t > &rownrs)
	Get the value of the expression evaluated for the entire column. More...

virtual Array< uChar >	getColumnuChar (const Vector< rownr_t > &rownrs)

virtual Array< Short >	getColumnShort (const Vector< rownr_t > &rownrs)

virtual Array< uShort >	getColumnuShort (const Vector< rownr_t > &rownrs)

virtual Array< Int >	getColumnInt (const Vector< rownr_t > &rownrs)

virtual Array< uInt >	getColumnuInt (const Vector< rownr_t > &rownrs)

virtual Array< Int64 >	getColumnInt64 (const Vector< rownr_t > &rownrs)

virtual Array< Float >	getColumnFloat (const Vector< rownr_t > &rownrs)

virtual Array< Double >	getColumnDouble (const Vector< rownr_t > &rownrs)

virtual Array< Complex >	getColumnComplex (const Vector< rownr_t > &rownrs)

virtual Array< DComplex >	getColumnDComplex (const Vector< rownr_t > &rownrs)

virtual Array< String >	getColumnString (const Vector< rownr_t > &rownrs)

virtual void	ranges (Block< TableExprRange > &)
	Convert the tree to a number of range vectors which at least select the same things. More...

NodeDataType	dataType () const
	Get the data type of the derived TableExprNode object. More...

Bool	isReal () const
	Is the data type real (i.e., integer or double)? More...

ValueType	valueType () const
	Get the value type. More...

void	setValueType (ValueType vtype)
	Set the value type. More...

OperType	operType () const
	Get the operator type. More...

ExprType	exprType () const
	Get the expression type. More...

Bool	isConstant () const
	Is the expression a constant? More...

const Unit &	unit () const
	Get the unit. More...

void	setUnit (const Unit &unit)
	Set the unit. More...

const Record &	attributes () const
	Get the attributes. More...

void	setAttributes (const Record &)
	Set the attributes. More...

Int	ndim () const
	Get the fixed dimensionality (same for all rows). More...

const IPosition &	shape () const
	Get the fixed shape (same for all rows). More...

const IPosition &	shape (const TableExprId &id)
	Get the shape for the given row. More...

virtual Bool	isDefined (const TableExprId &id)
	Is the value in the given row defined? The default implementation returns True. More...

Table &	table ()
	Get table. More...

const Table &	table () const

virtual void	adaptSetUnits (const Unit &)
	Let a set node convert itself to the given unit. More...

Static Public Member Functions
static NodeDataType	checkOperands (Block< Int > &dtypeOper, ValueType &resVT, FunctionType ftype, std::vector< TENShPtr > &nodes)
	Check the operands of the aggregate function and return the result's data type. More...

Static Public Member Functions inherited from casacore::TableExprFuncNode
static NodeDataType	checkOperands (Block< Int > &dtypeOper, ValueType &resVT, Block< Int > &vtypeOper, FunctionType, std::vector< TENShPtr > &)
	Check the data and value types of the operands. More...

static void	getPrintFormat (String &fmt, Int &width, Int &prec, const std::vector< TENShPtr > &operands, const TableExprId &id)
	Get the possible print format, width, and/or precision. More...

static String	stringDT (const MVTime &dt, Int prec, MVTime::formatTypes)
	Convert the date and/or time to a string. More...

static String	stringDateTime (const MVTime &dt, Int prec)

static String	stringDate (const MVTime &dt)

static String	stringTime (const MVTime &dt, Int prec)

static String	stringValue (Bool val, const String &fmt, Int width)
	Convert a value to a string. More...

static String	stringValue (Int64 val, const String &fmt, Int width)

static String	stringValue (Double val, const String &fmt, Int width, Int prec, const std::pair< int, int > &mvFormat, const Unit &unit)

static String	stringValue (const DComplex &val, const String &fmt, Int width, Int prec)

static String	stringValue (const String &val, const String &fmt, Int width)

static String	stringValue (const MVTime &val, const String &fmt, Int width, const std::pair< int, int > &mvFormat)

static String	stringAngle (double val, Int prec, MVAngle::formatTypes type)
	Convert angle to a string (hms or dms). More...

static String	stringHMS (double val, Int prec)

static String	stringDMS (double val, Int prec)

static std::pair< int, int >	getMVFormat (const String &fmt)
	Get the MVTime/Angle format and optional precision. More...

static double	angdist (double ra1, double dec1, double ra2, double dec2)
	Get the angular distance between two positions on a sphere. More...

static Int64	string2Int (const String &)
	Read a string as an integer, double, complex or bool. More...

static Double	string2Real (const String &)

static DComplex	string2Complex (const String &)

static Bool	string2Bool (const String &)

Static Public Member Functions inherited from casacore::TableExprNodeMulti
static uInt	checkNumOfArg (uInt low, uInt high, const std::vector< TENShPtr > &nodes)
	Check number of arguments low <= number_of_args <= high It throws an exception if wrong number of arguments. More...

static NodeDataType	checkDT (Block< Int > &dtypeOper, NodeDataType dtIn, NodeDataType dtOut, const std::vector< TENShPtr > &nodes, Bool dateConv=True)
	Check datatype of nodes and return output type. More...

Static Public Member Functions inherited from casacore::TableExprNodeRep
static TENShPtr	replaceConstNode (const TENShPtr &node)
	Replace a node with a constant expression by node with its value. More...

static void	createRange (Block< TableExprRange > &, TableExprNodeColumn *, Double start, Double end)
	Create a range object from a column and an interval. More...

static void	createRange (Block< TableExprRange > &)
	Create a empty range object. More...

static String	typeString (NodeDataType)
	Convert a NodeDataType to a string. More...

static String	typeString (ValueType)
	Convert a ValueType to a string. More...

Private Member Functions
TableExprGroupFuncBase *	doMakeGroupAggrFunc ()
	Do the actual creation of the correct aggregate function object. More...

Private Attributes
CountedPtr < TableExprGroupFuncBase >	itsFunc

Additional Inherited Members
Public Types inherited from casacore::TableExprFuncNode
enum	FunctionType { piFUNC, eFUNC, cFUNC, near2FUNC, near3FUNC, nearabs2FUNC, nearabs3FUNC, sinFUNC, sinhFUNC, cosFUNC, coshFUNC, expFUNC, logFUNC, log10FUNC, sqrtFUNC, powFUNC, conjFUNC, squareFUNC, cubeFUNC, minFUNC, maxFUNC, normFUNC, absFUNC, argFUNC, realFUNC, imagFUNC, intFUNC, asinFUNC, acosFUNC, atanFUNC, atan2FUNC, tanFUNC, tanhFUNC, signFUNC, roundFUNC, floorFUNC, ceilFUNC, fmodFUNC, complexFUNC, arrsumFUNC, arrsumsFUNC, runsumFUNC, boxsumFUNC, arrproductFUNC, arrproductsFUNC, runproductFUNC, boxproductFUNC, arrsumsqrFUNC, arrsumsqrsFUNC, runsumsqrFUNC, boxsumsqrFUNC, arrminFUNC, arrminsFUNC, runminFUNC, boxminFUNC, arrmaxFUNC, arrmaxsFUNC, runmaxFUNC, boxmaxFUNC, arrmeanFUNC, arrmeansFUNC, runmeanFUNC, boxmeanFUNC, arrvariance0FUNC, arrvariances0FUNC, runvariance0FUNC, boxvariance0FUNC, arrvariance1FUNC, arrvariances1FUNC, runvariance1FUNC, boxvariance1FUNC, arrstddev0FUNC, arrstddevs0FUNC, runstddev0FUNC, boxstddev0FUNC, arrstddev1FUNC, arrstddevs1FUNC, runstddev1FUNC, boxstddev1FUNC, arravdevFUNC, arravdevsFUNC, runavdevFUNC, boxavdevFUNC, arrrmsFUNC, arrrmssFUNC, runrmsFUNC, boxrmsFUNC, arrmedianFUNC, arrmediansFUNC, runmedianFUNC, boxmedianFUNC, arrfractileFUNC, arrfractilesFUNC, runfractileFUNC, boxfractileFUNC, arranyFUNC, arranysFUNC, runanyFUNC, boxanyFUNC, arrallFUNC, arrallsFUNC, runallFUNC, boxallFUNC, arrntrueFUNC, arrntruesFUNC, runntrueFUNC, boxntrueFUNC, arrnfalseFUNC, arrnfalsesFUNC, runnfalseFUNC, boxnfalseFUNC, arrayFUNC, transposeFUNC, areverseFUNC, resizeFUNC, diagonalFUNC, isnanFUNC, isinfFUNC, isfiniteFUNC, isdefFUNC, isnullFUNC, iscolFUNC, iskeyFUNC, ndimFUNC, nelemFUNC, shapeFUNC, strlengthFUNC, upcaseFUNC, downcaseFUNC, capitalizeFUNC, sreverseFUNC, trimFUNC, ltrimFUNC, rtrimFUNC, substrFUNC, replaceFUNC, regexFUNC, patternFUNC, sqlpatternFUNC, datetimeFUNC, mjdtodateFUNC, mjdFUNC, dateFUNC, timeFUNC, yearFUNC, monthFUNC, dayFUNC, cmonthFUNC, weekdayFUNC, cdowFUNC, weekFUNC, ctodFUNC, cdateFUNC, ctimeFUNC, stringFUNC, hmsFUNC, dmsFUNC, hdmsFUNC, randFUNC, rownrFUNC, rowidFUNC, iifFUNC, angdistFUNC, angdistxFUNC, conesFUNC, cones3FUNC, anyconeFUNC, anycone3FUNC, findconeFUNC, findcone3FUNC, normangleFUNC, boolFUNC, nullarrayFUNC, marrayFUNC, arrdataFUNC, arrmaskFUNC, negatemaskFUNC, replmaskedFUNC, replunmaskedFUNC, arrflatFUNC, FirstAggrFunc, countallFUNC, gcountFUNC, gfirstFUNC, glastFUNC, gminFUNC, gmaxFUNC, gsumFUNC, gproductFUNC, gsumsqrFUNC, gmeanFUNC, gvariance0FUNC, gvariance1FUNC, gstddev0FUNC, gstddev1FUNC, grmsFUNC, ganyFUNC, gallFUNC, gntrueFUNC, gnfalseFUNC, FirstAggrArrayFunc, gminsFUNC, gmaxsFUNC, gsumsFUNC, gproductsFUNC, gsumsqrsFUNC, gmeansFUNC, gvariances0FUNC, gvariances1FUNC, gstddevs0FUNC, gstddevs1FUNC, grmssFUNC, ganysFUNC, gallsFUNC, gntruesFUNC, gnfalsesFUNC, LastAggrArrayFunc, ghistFUNC, gaggrFUNC, growidFUNC, gmedianFUNC, gfractileFUNC, gexpridFUNC, NRFUNC }

Public Types inherited from casacore::TableExprNodeRep
enum	NodeDataType { NTBool, NTInt, NTDouble, NTComplex, NTString, NTRegex, NTDate, NTReal, NTDouCom, NTNumeric, NTAny }
	Define the data types of a node. More...

enum	ValueType { VTScalar, VTArray, VTRecord, VTSetElem, VTSet, VTIndex }
	Define the value types. More...

enum	OperType { OtPlus, OtMinus, OtTimes, OtDivide, OtModulo, OtBitAnd, OtBitOr, OtBitXor, OtBitNegate, OtEQ, OtGE, OtGT, OtNE, OtIN, OtAND, OtOR, OtNOT, OtMIN, OtColumn, OtField, OtLiteral, OtFunc, OtSlice, OtUndef, OtRownr, OtRandom }
	Define the operator types. More...

enum	ArgType { NoArr, ArrArr, ArrSca, ScaArr }
	Define the value types of the 2 arguments when arrays are involved. More...

enum	ExprType { Constant, Variable }
	Define (sub-)expression type. More...

Protected Member Functions inherited from casacore::TableExprNodeRep
virtual const IPosition &	getShape (const TableExprId &id)
	Get the shape for the given row. More...

virtual void	convertConstChild ()
	If one of the children is a constant, convert its data type to that of the other operand (if appropriate). More...

void	checkTablePtr (const TENShPtr &node)
	Check if this node uses the same table pointer. More...

void	fillExprType (const TENShPtr &node)
	Set expression type to Variable if node is Variable. More...

Static Protected Member Functions inherited from casacore::TableExprNodeRep
static void	checkTablePtr (Table &table, const TENShPtr &node)

static void	fillExprType (ExprType &, const TENShPtr &node)

static TENShPtr	convertNode (const TENShPtr &thisNode, Bool convertConstType)
	If the node is constant, it is evaluated and replaced by the appropriate TableExprNodeConst object. More...

Protected Attributes inherited from casacore::TableExprNodeMulti
std::vector< TENShPtr >	operands_p

Protected Attributes inherited from casacore::TableExprNodeRep
Table	table_p

NodeDataType	dtype_p

ValueType	vtype_p

OperType	optype_p

ArgType	argtype_p

ExprType	exprtype_p

Int	ndim_p

IPosition	shape_p

Unit	unit_p

Record	attributes_p

Detailed Description

TaQL node representing a scalar aggregate function.

Intended use:

Internal

Review Status

Test programs:: tTableGram

Synopsis

A TableExprAggrNode object is a special TableExprFuncNode object. Instead of operating on a single row, it operates on a group of table rows, usually formed by means of the GROUPBY clause. It aggregates the values in the rows in the group by means of an aggregation function derived from TableExprGroupFuncBase. Several standard aggregation functions (e.g., gmean, gmin, gsum) are defined in TaQL and implemented this way.

There are two types of aggregate function implementations:

Immediate aggregate functions calculate the results while the groups are being formed. In this way they step sequentially through the data. This is only possible for functions that do not have to keep to many data in memory.
Lazy aggregate functions calculate the results after the groups are formed using the vector of TableExprIds they get per group. In this way only data for a single group might need to be kept in memory. It is used, for instance, to calculate the median.

Note that this class handles operands that are a scalar or array. If array, all values in the array are used as individual values. Class TableExprAggrNodeArray handles aggregate functions giving an array result (e.g., function gaggr).

It is also possible to define an aggregate function in a UDF derived from class UDFBase. Such an aggregate function is instantiated as a TableExprUDFNode(Array) object, not as TabeExprAggrNode(Array). These functions are always lazy.

Definition at line 83 of file ExprAggrNode.h.

Constructor & Destructor Documentation

casacore::TableExprAggrNode::TableExprAggrNode	(	FunctionType	,
		NodeDataType	,
		ValueType	,
		const TableExprNodeSet &	source,
		const vector< TENShPtr > &	nodes,
		const Block< Int > &	dtypeOper
	)

Constructor.

Member Function Documentation

static NodeDataType casacore::TableExprAggrNode::checkOperands	(	Block< Int > &	dtypeOper,
		ValueType &	resVT,
		FunctionType	ftype,
		std::vector< TENShPtr > &	nodes
	)