You've already forked mariadb-columnstore-engine
mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-10-31 18:30:33 +03:00
332 lines
12 KiB
C++
332 lines
12 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
|
|
Copyright (C) 2016 MariaDB Corporaton
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; version 2 of
|
|
the License.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
/***********************************************************************
|
|
* $Id$
|
|
*
|
|
*
|
|
***********************************************************************/
|
|
|
|
/**
|
|
* MariaDB ColumnStore interface for writing a user defined function (UDF).
|
|
*
|
|
* The basic steps are:
|
|
*
|
|
* 1. add the UDF function interface in udfsdk.h
|
|
* 2. add the UDF function implementation in udfsdk.cpp
|
|
* 3. add the connector stub for this UDF function in udfsdk.cpp
|
|
* 4. build the dynamic library libudfsdk
|
|
* 5. put the library in /usr/local/mariadb/columnstore/lib of all modules
|
|
* 6. restart MariaDB ColumnStore
|
|
* 7. Register the new functions with the commands like:
|
|
*
|
|
* CREATE FUNCTION mcs_add returns REAL soname 'libudfsdk.so';
|
|
* CREATE FUNCTION mcs_isnull returns BOOL soname 'libudfsdk.so';
|
|
*
|
|
* The UDF functions run distributedly in the ColumnStore engine. The evaluation
|
|
* is row by row. Aggregate UDF is currently not supported. Two examples are
|
|
* given in this file to demonstrate the steps that it takes to create a UDF
|
|
* function. More examples can be found in utils/funcexp/func_*.cpp.
|
|
*/
|
|
|
|
#include "funcexp.h"
|
|
#include "functor.h"
|
|
|
|
#if defined(_MSC_VER) && defined(UDFSDK_DLLEXPORT)
|
|
#define EXPORT __declspec(dllexport)
|
|
#else
|
|
#define EXPORT
|
|
#endif
|
|
|
|
namespace udfsdk
|
|
{
|
|
|
|
/**
|
|
* UDFSDK interface. Do not make modification here.
|
|
*/
|
|
class UDFSDK
|
|
{
|
|
public:
|
|
EXPORT UDFSDK();
|
|
|
|
EXPORT ~UDFSDK();
|
|
|
|
EXPORT funcexp::FuncMap UDFMap() const;
|
|
|
|
protected:
|
|
|
|
private:
|
|
//defaults okay
|
|
//UDFSDK(const UDFSDK& rhs);
|
|
//UDFSDK& operator=(const UDFSDK& rhs);
|
|
|
|
};
|
|
|
|
/**
|
|
* Example: MCS_add (args1, args2)
|
|
*
|
|
* MCS_add takes two arguments of any data type. It returns a double result.
|
|
*
|
|
* The function interface is defined here. All UDF functions are derived from
|
|
* class funcexp::Func. A set of getXXXval interface APIs are declared in the
|
|
* parent class Func, which will be called by IDB function and expression (F&E)
|
|
* framwork when evaluating the function. Which API to be called depends on
|
|
* the context of the function in the SQL query, i.e., the result type that
|
|
* the function is expected to return.
|
|
*
|
|
* For example, given the following two queries, different APIs will be called
|
|
* to evaluate the function MCS_add.
|
|
*
|
|
* select MCS_add(int1, int2) from t1;
|
|
* getDoubleVal() is called, because the result type of MCS_add is DOUBLE(real).
|
|
*
|
|
* select substr(string1, int1, MCS_add(int1+int2));
|
|
* getIntVal() will be called, because MCS_add() is passed as the third argument
|
|
* to substr function, and an integer result is expected.
|
|
*
|
|
* If one API is not implemented but called for a function, IDB-5001 error will
|
|
* be returned.
|
|
*/
|
|
class MCS_add : public funcexp::Func
|
|
{
|
|
public:
|
|
/*
|
|
* Constructor. Pass the function name to the base constructor.
|
|
*/
|
|
MCS_add() : Func("mcs_add") {}
|
|
|
|
/*
|
|
* Destructor. MCS_add does not need to do anything here to clean up.
|
|
*/
|
|
virtual ~MCS_add() {}
|
|
|
|
/**
|
|
* Decide on the function's operation type
|
|
*
|
|
* Operation type decides which API needs to be called for each function
|
|
* parameter. Sometimes it is obvious. e.g. for function substr (c1, c2, c3),
|
|
* one knows that getStrVal(), getIntVal() and getIntVal() should be called for
|
|
* the three parameters in sequence. In that case, a dummy type can be returned
|
|
* because it won't be used in the function implementation. Sometimes the
|
|
* operation type is decided by the data type of the function parameters.
|
|
* e.g., isnull(c1) function, one should call the corresponding getXXXval()
|
|
* function that in compatible with the result type of c1.
|
|
*
|
|
* @parm fp vector of function parameters
|
|
* Each element is a boost::shared_ptr of execplan::ParseTree. class
|
|
* ParseTree is defined in ~/dbcon/execplan/parsetree.h
|
|
* @parm resultType result type of this function
|
|
* Sometimes it may affect the operation type, but most of the time it
|
|
* can be ignored. Struct ColType is defined in ~/dbcon/execplan/calpontsystemcatalog.h
|
|
* @return operation type for this function
|
|
*
|
|
* This function is called only one from the connector. Once it's determined, it
|
|
* will be passed to the getXXXval() APIs during function evaluation.
|
|
*/
|
|
execplan::CalpontSystemCatalog::ColType operationType(funcexp::FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType);
|
|
|
|
/**
|
|
* Returns an integer result of this function.
|
|
* All the getXXXvalue APIs take the same arguments. They will be called
|
|
* for every row in the result set when the function is being evaluated.
|
|
* So these functions needs to be efficient.
|
|
*
|
|
* @parm row reference of the current row
|
|
* @parm fp function parameters
|
|
* @parm isNull NULL indicator throughout this function evaluation.
|
|
* the same reference is passed to all the function argument
|
|
* evaluations. One always need to know if any argument is NULL
|
|
* to decide the result of the function. It's explained in detail
|
|
* in MCS_isnull() function example.
|
|
* @parm op_ct the operation type that is determined in operationType().
|
|
*
|
|
*/
|
|
virtual int64_t getIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a double result of this function.
|
|
*/
|
|
|
|
virtual double getDoubleVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a float result of this function.
|
|
*/
|
|
virtual float getFloatVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a string result of this function.
|
|
*/
|
|
virtual std::string getStrVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a bool result of this function.
|
|
*/
|
|
virtual bool getBoolVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a decimal result of this function.
|
|
*
|
|
* IDB_Decimal is defined in ~/execplan/treenode.h
|
|
*/
|
|
virtual execplan::IDB_Decimal getDecimalVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns an integer representation of a date result of the function.
|
|
*
|
|
* Check the date/time functions in ~/utils/funcexp for implementation
|
|
* example of this API.
|
|
*/
|
|
virtual int32_t getDateIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns an integer representation of a datetime result of the function.
|
|
*
|
|
* Check the date/time functions in ~/utils/funcexp for implementation
|
|
* example of this API.
|
|
*/
|
|
virtual int64_t getDatetimeIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
};
|
|
|
|
/**
|
|
* Example: MCS_isnull(arg1)
|
|
*
|
|
* The purpose of this example is to demostrate the NULL handling in the UDF interface
|
|
*/
|
|
class MCS_isnull : public funcexp::Func
|
|
{
|
|
public:
|
|
/*
|
|
* Constructor. Pass the function name to the base constructor.
|
|
*/
|
|
MCS_isnull() : Func("mcs_isnull") {}
|
|
|
|
/*
|
|
* Destructor. MCS_add does not need to do anything here to clean up.
|
|
*/
|
|
virtual ~MCS_isnull() {}
|
|
|
|
/**
|
|
* Decide on the function's operation type
|
|
*/
|
|
execplan::CalpontSystemCatalog::ColType operationType(funcexp::FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType);
|
|
|
|
/**
|
|
* Returns an integer result of this function.
|
|
*/
|
|
virtual int64_t getIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a double result of this function.
|
|
*/
|
|
virtual double getDoubleVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a float result of this function.
|
|
*/
|
|
virtual float getFloatVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a string result of this function.
|
|
*/
|
|
virtual std::string getStrVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a bool result of this function.
|
|
*/
|
|
virtual bool getBoolVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns a decimal result of this function.
|
|
*
|
|
* IDB_Decimal is defined in ~/execplan/treenode.h
|
|
*/
|
|
virtual execplan::IDB_Decimal getDecimalVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns an integer representation of a date result of the function.
|
|
*
|
|
* Check the date/time functions in ~/utils/funcexp for implementation
|
|
* example of this API.
|
|
*/
|
|
virtual int32_t getDateIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
|
|
/**
|
|
* Returns an integer representation of a datetime result of the function.
|
|
*
|
|
* Check the date/time functions in ~/utils/funcexp for implementation
|
|
* example of this API.
|
|
*/
|
|
virtual int64_t getDatetimeIntVal(rowgroup::Row& row,
|
|
funcexp::FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType& op_ct);
|
|
};
|
|
|
|
}
|
|
|
|
#undef EXPORT
|
|
|
|
// vim:ts=4 sw=4:
|
|
|