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/************************************************************************************
Copyright (C) 2017 MariaDB Corporation AB
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 see <http://www.gnu.org/licenses>
or write to the Free Software Foundation, Inc.,
51 Franklin St., Fifth Floor, Boston, MA 02110, USA
*************************************************************************************/
#ifndef UTILS_WF_UDAF_H
#define UTILS_WF_UDAF_H
#ifndef _MSC_VER
#include <tr1/unordered_map>
#else
#include <unordered_map>
#endif
#include "windowfunctiontype.h"
#include "mcsv1_udaf.h"
namespace windowfunction
{
// Hash classes for the distinct hashmap
class DistinctHasher
{
public:
inline size_t operator()(const static_any::any& a) const
{
return a.getHash();
}
};
class DistinctEqual
{
public:
inline bool operator()(const static_any::any lhs, static_any::any rhs) const
{
return lhs == rhs;
}
};
// A class to control the execution of User Define Analytic Functions (UDAnF)
// as defined by a specialization of mcsv1sdk::mcsv1_UDAF
class WF_udaf : public WindowFunctionType
{
public:
WF_udaf(int id, const std::string& name, mcsv1sdk::mcsv1Context& context)
: WindowFunctionType(id, name), fUDAFContext(context), fDistinct(false), bHasDropValue(true)
{
}
WF_udaf(WF_udaf& rhs);
// pure virtual in base
void operator()(int64_t b, int64_t e, int64_t c);
WindowFunctionType* clone() const;
void resetData();
void parseParms(const std::vector<execplan::SRCP>&);
virtual bool dropValues(int64_t, int64_t);
mcsv1sdk::mcsv1Context& getContext()
{
return fUDAFContext;
}
bool getInterrupted()
{
return bInterrupted;
}
bool* getInterruptedPtr()
{
return &bInterrupted;
}
bool getDistinct()
{
return fDistinct;
}
void setDistinct(bool d = true)
{
fDistinct = d;
}
protected:
void SetUDAFValue(static_any::any& valOut, int64_t colOut, int64_t b, int64_t e, int64_t c);
mcsv1sdk::mcsv1Context fUDAFContext; // The UDAF context
bool bInterrupted; // Shared by all the threads
bool fDistinct;
bool bRespectNulls; // respect null | ignore null
bool bHasDropValue; // Set to false when we discover the UDAnF doesn't implement dropValue.
// To hold distinct values and their counts
typedef std::tr1::unordered_map<static_any::any, uint64_t, DistinctHasher, DistinctEqual> DistinctMap;
DistinctMap fDistinctMap;
static_any::any fValOut; // The return value
public:
static boost::shared_ptr<WindowFunctionType> makeFunction(int id, const string& name, int ct,
mcsv1sdk::mcsv1Context& context,
WindowFunctionColumn* wc);
};
} // namespace windowfunction
#endif // UTILS_WF_UDAF_H
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