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//# ExprAggrNodeArray.h: TaQL node representing an array aggregate function
//# Copyright (C) 2013
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id: TaQLNode.h 21051 2011-04-20 11:46:29Z gervandiepen $
#ifndef TABLES_EXPRAGGRNODEARRAY_H
#define TABLES_EXPRAGGRNODEARRAY_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/tables/TaQL/ExprFuncNodeArray.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations.
class TableExprGroupFuncBase;
class TableExprGroupFuncSet;
// <summary>
// TaQL node representing an array aggregate function
// </summary>
// <use visibility=local>
// <reviewed reviewer="" date="" tests="tTaQLNode">
// </reviewed>
// <synopsis>
// This class is similar to TableExprAggrNode, but its result is an array
// instead of a scalar value.
// There are few aggregate functions resulting in an array. An example
// is <src>gaggr</src>, which aggregates the non-empty arrays in a group
// into a single array. Other functions (like medians, runningmean, etc.)
// can be applied to its result making it quite versatile.
//
// Most array aggregate functions are lazy to avoid using too much memory.
// </synopsis>
class TableExprAggrNodeArray: public TableExprFuncNodeArray
{
public:
// Constructor.
TableExprAggrNodeArray (TableExprFuncNode::FunctionType,
NodeDataType, ValueType,
const TableExprNodeSet& source,
const vector<TENShPtr>& nodes,
const Block<Int>& dtypeOper,
const TaQLStyle& style);
// Get the nodes representing an aggregate function.
virtual void getAggrNodes (std::vector<TableExprNodeRep*>& aggr);
// Get the operand node.
TENShPtr operand()
{ return (operands().empty() ? TENShPtr() : operands()[0]); }
// Create the correct aggregate function object.
virtual CountedPtr<TableExprGroupFuncBase> makeGroupAggrFunc();
// Is the array aggregate function lazy?
virtual Bool isLazyAggregate() const;
// Functions to get the result of an aggregate function.
// <group>
virtual MArray<Bool> getArrayBool (const TableExprId& id);
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);
// </group>
private:
// Create the correct aggregate function object.
CountedPtr<TableExprGroupFuncBase> doMakeGroupAggrFunc();
//# Data members.
CountedPtr<TableExprGroupFuncBase> itsFunc;
};
} //# NAMESPACE CASACORE - END
#endif
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