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MCOL-825 : update udf to columnstore naming

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This commit is contained in:
David Thompson 2017-07-20 20:07:21 -07:00
parent 853eb1388e
commit 1c032cbec6
5 changed files with 95 additions and 98 deletions
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2
utils/udfsdk/CMakeLists.txt
View File

@ -4,7 +4,7 @@ include_directories( ${ENGINE_COMMON_INCLUDES}
########### next target ############### ########### next target ###############
set(udfsdk_LIB_SRCS udfinfinidb.cpp) set(udfsdk_LIB_SRCS udfsdk.cpp)
add_definitions(-DMYSQL_DYNAMIC_PLUGIN) add_definitions(-DMYSQL_DYNAMIC_PLUGIN)

39
utils/udfsdk/README.txt
View File

@ -1,26 +1,23 @@
How to use the InfiniDB UDF SDK How to use the ColumnStore UDF SDK
Make sure you have a working GCC C++ compiler system, version 4.1.2 or later. You Obtain the MariaDB columnstore source code from https://github.com/mariadb-corporation/mariadb-columnstore-server
also must have the libxml2-devel package installed. and follow the pre-requisite and build instructions.
Obtain the InfiniDB source distribution for your version of InfiniDB
from github.com.
Ideally, the machine you are compiling on and deploying on are the same machine. If this
is not possible, they must have the same InfiniDB software installation.
Unpack the source tar file
Go into the utils/udfsdk directory. Go into the utils/udfsdk directory.
At this point you can use the idb_add() function template in udfinfinidb.cpp and udfmysql.cpp At this point you can use the MCS_add() function template in udfsdk.cpp and udfmysql.cpp
files to create your own function or just try that function as is. files to create your own function or just try that function as is.
Make the library - Make the library
Stop InfiniDB $ make
Copy the libudf_mysql.so.1.0.0 and libudfsdk.so.1.0.0 file to /usr/local/mariadb/columnstore/lib on - Copy the libudf_mysql.so.1.0.0 and libudfsdk.so.1.0.0 file to /usr/local/mariadb/columnstore/lib on
every InfiniDB node every columnstore node.
Start InfiniDB $ sudo cp libudf_mysql.so.1.0.0 libudfsdk.so.1.0.0 /usr/local/mariadb/columnstore/lib/
In the directory /usr/local/mariadb/columnstore/mysql/lib64/mysql/plugin create a symbolic link called - Restart ColumnStore
libudf_msql.so to the file /usr/local/mariadb/columnstore/lib/libudf_msql.so.1.0.0 $ mcsadmin restartsystem y
In the mysql client add the function (e.g. "create function idb_add returns integer soname - Using the mcsmysql client add the user defined function, e.g,
'libudf_msql.so';") $ mcsmysql
You should now be able to use the idb_add() function in the select and/or where clauses > create function mcs_add returns integer soname 'libudf_mysql.so';
of SQL statements. > create function mcs_isnull returns string soname 'libudf_mysql.so';
You should now be able to use the mcs_add(arg1, arg2) and mcs_isnull(arg) functions in the select and/or where clauses
of SQL statements.

28
utils/udfsdk/udfmysql.cpp
View File

@ -82,8 +82,8 @@ inline string cvtArgToString(int t, const char* v)
} }
/**************************************************************************** /****************************************************************************
* UDF function interface for MySQL connector to recognize is defined in * UDF function interface for MariaDB connector to recognize is defined in
* this section. MySQL's UDF function creation guideline needs to be followed. * this section. MariaDB's UDF function creation guideline needs to be followed.
* *
* Three interface need to be defined on the connector for each UDF function. * Three interface need to be defined on the connector for each UDF function.
* *
@ -91,12 +91,12 @@ inline string cvtArgToString(int t, const char* v)
* the input. * the input.
* XXX_deinit: To clean up the memory. * XXX_deinit: To clean up the memory.
* XXX: The function implementation. * XXX: The function implementation.
* Detailed instruction can be found at MySQL source directory: * Detailed instruction can be found at MariaDB source directory:
* ~/sql/udf_example.cc. * ~/sql/udf_example.cc.
* *
* Please note that the implementation of the function defined on the connector * Please note that the implementation of the function defined on the connector
* will only be called when all the input arguments are constant. e.g., * will only be called when all the input arguments are constant. e.g.,
* idb_add(2,3). That way, the function does not run in a distributed fashion * mcs_add(2,3). That way, the function does not run in a distributed fashion
* and could be slow. If there is a need for the UDF function to run with * and could be slow. If there is a need for the UDF function to run with
* pure constant input, then one needs to put a implementation in the XXX * pure constant input, then one needs to put a implementation in the XXX
* body, which is very similar to the ones in getXXXval API. If there's no * body, which is very similar to the ones in getXXXval API. If there's no
@ -106,16 +106,16 @@ inline string cvtArgToString(int t, const char* v)
extern "C" extern "C"
{ {
/** /**
* IDB_ADD connector stub * MCS_ADD connector stub
*/ */
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
my_bool idb_add_init(UDF_INIT* initid, UDF_ARGS* args, char* message) my_bool mcs_add_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{ {
if (args->arg_count != 2) if (args->arg_count != 2)
{ {
strcpy(message,"idb_add() requires two argument"); strcpy(message,"mcs_add() requires two argument");
return 1; return 1;
} }
@ -125,14 +125,14 @@ my_bool idb_add_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
void idb_add_deinit(UDF_INIT* initid) void mcs_add_deinit(UDF_INIT* initid)
{ {
} }
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
double idb_add(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error) double mcs_add(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
{ {
double op1, op2; double op1, op2;
@ -143,17 +143,17 @@ double idb_add(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
} }
/** /**
* IDB_ISNULL connector stub * MCS_ISNULL connector stub
*/ */
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
my_bool idb_isnull_init(UDF_INIT* initid, UDF_ARGS* args, char* message) my_bool mcs_isnull_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{ {
if (args->arg_count != 1) if (args->arg_count != 1)
{ {
strcpy(message,"idb_isnull() requires one argument"); strcpy(message,"mcs_isnull() requires one argument");
return 1; return 1;
} }
@ -163,14 +163,14 @@ my_bool idb_isnull_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
void idb_isnull_deinit(UDF_INIT* initid) void mcs_isnull_deinit(UDF_INIT* initid)
{ {
} }
#ifdef _MSC_VER #ifdef _MSC_VER
__declspec(dllexport) __declspec(dllexport)
#endif #endif
long long idb_isnull(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error) long long mcs_isnull(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
{ {
return 0; return 0;
} }

70
utils/udfsdk/udfinfinidb.cpp → utils/udfsdk/udfsdk.cpp
View File

@ -53,9 +53,9 @@ UDFSDK::~UDFSDK()
/** /**
* All UDF functions should be registered in the function map. They will be * All UDF functions should be registered in the function map. They will be
* picked up by the InfiniDB F&E framework when the servers are started. * picked up by the MariaDB ColumnStore F&E framework when the servers are started.
* That will make sure the UDF functions runs distributedly in InfiniDB * That will make sure the UDF functions runs distributedly in ColumnStore
* engines just like the internal InfiniDB functions. * engines just like the internal ColumnStore functions.
*/ */
FuncMap UDFSDK::UDFMap() const FuncMap UDFSDK::UDFMap() const
{ {
@ -64,23 +64,23 @@ FuncMap UDFSDK::UDFMap() const
// first: function name // first: function name
// second: Function pointer // second: Function pointer
// please use lower case for the function name. Because the names might be // please use lower case for the function name. Because the names might be
// case-insensitive in MySQL depending on the setting. In such case, // case-insensitive in MariaDB depending on the setting. In such case,
// the function names passed to the interface is always in lower case. // the function names passed to the interface is always in lower case.
fm["idb_add"] = new IDB_add(); fm["mcs_add"] = new MCS_add();
fm["idb_isnull"] = new IDB_isnull(); fm["mcs_isnull"] = new MCS_isnull();
return fm; return fm;
} }
/*************************************************************************** /***************************************************************************
* IDB_ADD implementation * MCS_ADD implementation
* *
* OperationType() definition * OperationType() definition
*/ */
CalpontSystemCatalog::ColType IDB_add::operationType (FunctionParm& fp, CalpontSystemCatalog::ColType MCS_add::operationType (FunctionParm& fp,
CalpontSystemCatalog::ColType& resultType) CalpontSystemCatalog::ColType& resultType)
{ {
// operation type of idb_add is determined by the argument types // operation type of MCS_add is determined by the argument types
assert (fp.size() == 2); assert (fp.size() == 2);
CalpontSystemCatalog::ColType rt; CalpontSystemCatalog::ColType rt;
if (fp[0]->data()->resultType() == fp[1]->data()->resultType()) if (fp[0]->data()->resultType() == fp[1]->data()->resultType())
@ -135,7 +135,7 @@ CalpontSystemCatalog::ColType IDB_add::operationType (FunctionParm& fp,
* *
* This API is called when an double value is needed to return from the UDF function * This API is called when an double value is needed to return from the UDF function
*/ */
double IDB_add::getDoubleVal(Row& row, double MCS_add::getDoubleVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -190,7 +190,7 @@ double IDB_add::getDoubleVal(Row& row,
return 0; return 0;
} }
float IDB_add::getFloatVal(Row& row, float MCS_add::getFloatVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -203,11 +203,11 @@ float IDB_add::getFloatVal(Row& row,
* *
* This API is called when an integer value is needed to return from the UDF function * This API is called when an integer value is needed to return from the UDF function
* *
* Because the result type idb_add is double(real), all the other API can simply call * Because the result type MCS_add is double(real), all the other API can simply call
* getDoubleVal and apply the conversion. This method may not fit for all the UDF * getDoubleVal and apply the conversion. This method may not fit for all the UDF
* implementation. * implementation.
*/ */
int64_t IDB_add::getIntVal(Row& row, int64_t MCS_add::getIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -215,7 +215,7 @@ int64_t IDB_add::getIntVal(Row& row,
return (int64_t)getDoubleVal(row, parm, isNull, op_ct); return (int64_t)getDoubleVal(row, parm, isNull, op_ct);
} }
string IDB_add::getStrVal(Row& row, string MCS_add::getStrVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -227,7 +227,7 @@ string IDB_add::getStrVal(Row& row,
return oss.str(); return oss.str();
} }
IDB_Decimal IDB_add::getDecimalVal(Row& row, IDB_Decimal MCS_add::getDecimalVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -239,26 +239,26 @@ IDB_Decimal IDB_add::getDecimalVal(Row& row,
} }
/** /**
* This API should never be called for IDB_add, because the latter * This API should never be called for MCS_add, because the latter
* is not for date/datetime values addition. In such case, one can * is not for date/datetime values addition. In such case, one can
* either not implement this API and an IDB-5001 error will be thrown, * either not implement this API and an IDB-5001 error will be thrown,
* or throw a customized exception here. * or throw a customized exception here.
*/ */
int32_t IDB_add::getDateIntVal(Row& row, int32_t MCS_add::getDateIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
{ {
throw logic_error("Invalid API called for IDB_ADD"); throw logic_error("Invalid API called for MCS_ADD");
} }
/** /**
* This API should never be called for IDB_add, because the latter * This API should never be called for MCS_add, because the latter
* is not for date/datetime values addition. In such case, one can * is not for date/datetime values addition. In such case, one can
* either not implement this API and an IDB-5001 error will be thrown, * either not implement this API and an IDB-5001 error will be thrown,
* or throw a customized exception here. * or throw a customized exception here.
*/ */
int64_t IDB_add::getDatetimeIntVal(Row& row, int64_t MCS_add::getDatetimeIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -266,7 +266,7 @@ int64_t IDB_add::getDatetimeIntVal(Row& row,
return (int64_t)getDoubleVal(row, parm, isNull, op_ct); return (int64_t)getDoubleVal(row, parm, isNull, op_ct);
} }
bool IDB_add::getBoolVal(Row& row, bool MCS_add::getBoolVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -275,14 +275,14 @@ bool IDB_add::getBoolVal(Row& row,
} }
/*************************************************************************** /***************************************************************************
* IDB_ISNULL implementation * MCS_ISNULL implementation
* *
* OperationType() definition * OperationType() definition
*/ */
CalpontSystemCatalog::ColType IDB_isnull::operationType (FunctionParm& fp, CalpontSystemCatalog::ColType MCS_isnull::operationType (FunctionParm& fp,
CalpontSystemCatalog::ColType& resultType) CalpontSystemCatalog::ColType& resultType)
{ {
// operation type of idb_isnull should be the same as the argument type // operation type of MCS_isnull should be the same as the argument type
assert (fp.size() == 1); assert (fp.size() == 1);
return fp[0]->data()->resultType(); return fp[0]->data()->resultType();
} }
@ -290,9 +290,9 @@ CalpontSystemCatalog::ColType IDB_isnull::operationType (FunctionParm& fp,
/** /**
* getBoolVal API definition * getBoolVal API definition
* *
* This would be the most commonly called API for idb_isnull function * This would be the most commonly called API for MCS_isnull function
*/ */
bool IDB_isnull::getBoolVal(Row& row, bool MCS_isnull::getBoolVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -304,7 +304,7 @@ bool IDB_isnull::getBoolVal(Row& row,
// in parameter isNull will be set if the parameter is evaluated NULL. // in parameter isNull will be set if the parameter is evaluated NULL.
// Please note that before this function returns, isNull should be set to // Please note that before this function returns, isNull should be set to
// false, otherwise the result of the function would be considered NULL, // false, otherwise the result of the function would be considered NULL,
// which is not possible for idb_isnull(). // which is not possible for MCS_isnull().
case CalpontSystemCatalog::DECIMAL: case CalpontSystemCatalog::DECIMAL:
case CalpontSystemCatalog::UDECIMAL: case CalpontSystemCatalog::UDECIMAL:
parm[0]->data()->getDecimalVal(row, isNull); parm[0]->data()->getDecimalVal(row, isNull);
@ -327,7 +327,7 @@ bool IDB_isnull::getBoolVal(Row& row,
* *
* This API is called when a double value is needed to return from the UDF function * This API is called when a double value is needed to return from the UDF function
*/ */
double IDB_isnull::getDoubleVal(Row& row, double MCS_isnull::getDoubleVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -335,7 +335,7 @@ double IDB_isnull::getDoubleVal(Row& row,
return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0); return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0);
} }
float IDB_isnull::getFloatVal(Row& row, float MCS_isnull::getFloatVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -348,11 +348,11 @@ float IDB_isnull::getFloatVal(Row& row,
* *
* This API is called when an integer value is needed to return from the UDF function * This API is called when an integer value is needed to return from the UDF function
* *
* Because the result type idb_add is double(real), all the other API can simply call * Because the result type MCS_add is double(real), all the other API can simply call
* getDoubleVal and apply the conversion. This method may not fit for all the UDF * getDoubleVal and apply the conversion. This method may not fit for all the UDF
* implementations. * implementations.
*/ */
int64_t IDB_isnull::getIntVal(Row& row, int64_t MCS_isnull::getIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -360,7 +360,7 @@ int64_t IDB_isnull::getIntVal(Row& row,
return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0); return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0);
} }
string IDB_isnull::getStrVal(Row& row, string MCS_isnull::getStrVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -371,7 +371,7 @@ string IDB_isnull::getStrVal(Row& row,
} }
IDB_Decimal IDB_isnull::getDecimalVal(Row& row, IDB_Decimal MCS_isnull::getDecimalVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -382,7 +382,7 @@ IDB_Decimal IDB_isnull::getDecimalVal(Row& row,
return dec; return dec;
} }
int32_t IDB_isnull::getDateIntVal(Row& row, int32_t MCS_isnull::getDateIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)
@ -390,7 +390,7 @@ int32_t IDB_isnull::getDateIntVal(Row& row,
return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0); return (getBoolVal(row, parm, isNull, op_ct) ? 1 : 0);
} }
int64_t IDB_isnull::getDatetimeIntVal(Row& row, int64_t MCS_isnull::getDatetimeIntVal(Row& row,
FunctionParm& parm, FunctionParm& parm,
bool& isNull, bool& isNull,
CalpontSystemCatalog::ColType& op_ct) CalpontSystemCatalog::ColType& op_ct)

54
utils/udfsdk/udfsdk.h
View File

@ -23,7 +23,7 @@
***********************************************************************/ ***********************************************************************/
/** /**
* InfiniDB interface for writing a user defined function (UDF). * MariaDB ColumnStore interface for writing a user defined function (UDF).
* *
* The basic steps are: * The basic steps are:
* *
@ -32,13 +32,13 @@
* 3. add the connector stub for this UDF function in udfsdk.cpp * 3. add the connector stub for this UDF function in udfsdk.cpp
* 4. build the dynamic library libudfsdk * 4. build the dynamic library libudfsdk
* 5. put the library in /usr/local/mariadb/columnstore/lib of all modules * 5. put the library in /usr/local/mariadb/columnstore/lib of all modules
* 6. restart all the InfiniDB servers and MySQL server * 6. restart MariaDB ColumnStore
* 7. notify mysqld about the new functions with the commands like: * 7. Register the new functions with the commands like:
* *
* CREATE FUNCTION idb_add returns REAL soname 'libudfsdk.so'; * CREATE FUNCTION mcs_add returns REAL soname 'libudfsdk.so';
* CREATE FUNCTION idb_isnull returns BOOL soname 'libudfsdk.so'; * CREATE FUNCTION mcs_isnull returns BOOL soname 'libudfsdk.so';
* *
* The UDF functions run distributedly in the InfiniDB engine. The evaluation * The UDF functions run distributedly in the ColumnStore engine. The evaluation
* is row by row. Aggregate UDF is currently not supported. Two examples are * 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 * 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. * function. More examples can be found in utils/funcexp/func_*.cpp.
@ -78,9 +78,9 @@ private:
}; };
/** /**
* Example: IDB_add (args1, args2) * Example: MCS_add (args1, args2)
* *
* IDB_add takes two arguments of any data type. It returns a double result. * 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 * 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 * class funcexp::Func. A set of getXXXval interface APIs are declared in the
@ -90,30 +90,30 @@ private:
* the function is expected to return. * the function is expected to return.
* *
* For example, given the following two queries, different APIs will be called * For example, given the following two queries, different APIs will be called
* to evaluate the function idb_add. * to evaluate the function MCS_add.
* *
* select idb_add(int1, int2) from t1; * select MCS_add(int1, int2) from t1;
* getDoubleVal() is called, because the result type of idb_add is DOUBLE(real). * getDoubleVal() is called, because the result type of MCS_add is DOUBLE(real).
* *
* select substr(string1, int1, idb_add(int1+int2)); * select substr(string1, int1, MCS_add(int1+int2));
* getIntVal() will be called, because idb_add() is passed as the third argument * getIntVal() will be called, because MCS_add() is passed as the third argument
* to substr function, and an integer result is expected. * to substr function, and an integer result is expected.
* *
* If one API is not implemented but called for a function, IDB-5001 error will * If one API is not implemented but called for a function, IDB-5001 error will
* be returned. * be returned.
*/ */
class IDB_add : public funcexp::Func class MCS_add : public funcexp::Func
{ {
public: public:
/* /*
* Constructor. Pass the function name to the base constructor. * Constructor. Pass the function name to the base constructor.
*/ */
IDB_add() : Func("idb_add") {} MCS_add() : Func("mcs_add") {}
/* /*
* Destructor. IDB_add does not need to do anything here to clean up. * Destructor. MCS_add does not need to do anything here to clean up.
*/ */
virtual ~IDB_add() {} virtual ~MCS_add() {}
/** /**
* Decide on the function's operation type * Decide on the function's operation type
@ -152,7 +152,7 @@ public:
* the same reference is passed to all the function argument * the same reference is passed to all the function argument
* evaluations. One always need to know if any argument is NULL * evaluations. One always need to know if any argument is NULL
* to decide the result of the function. It's explained in detail * to decide the result of the function. It's explained in detail
* in idb_isnull() function example. * in MCS_isnull() function example.
* @parm op_ct the operation type that is determined in operationType(). * @parm op_ct the operation type that is determined in operationType().
* *
*/ */
@ -205,7 +205,7 @@ public:
execplan::CalpontSystemCatalog::ColType& op_ct); execplan::CalpontSystemCatalog::ColType& op_ct);
/** /**
* Returns an InfiniDB integer representation of a date result of the function. * Returns an integer representation of a date result of the function.
* *
* Check the date/time functions in ~/utils/funcexp for implementation * Check the date/time functions in ~/utils/funcexp for implementation
* example of this API. * example of this API.
@ -216,7 +216,7 @@ public:
execplan::CalpontSystemCatalog::ColType& op_ct); execplan::CalpontSystemCatalog::ColType& op_ct);
/** /**
* Returns an InfiniDB integer representation of a datetime result of the function. * Returns an integer representation of a datetime result of the function.
* *
* Check the date/time functions in ~/utils/funcexp for implementation * Check the date/time functions in ~/utils/funcexp for implementation
* example of this API. * example of this API.
@ -228,22 +228,22 @@ public:
}; };
/** /**
* Example: IDB_isnull(arg1) * Example: MCS_isnull(arg1)
* *
* The purpose of this example is to demostrate the NULL handling in the UDF interface * The purpose of this example is to demostrate the NULL handling in the UDF interface
*/ */
class IDB_isnull : public funcexp::Func class MCS_isnull : public funcexp::Func
{ {
public: public:
/* /*
* Constructor. Pass the function name to the base constructor. * Constructor. Pass the function name to the base constructor.
*/ */
IDB_isnull() : Func("idb_isnull") {} MCS_isnull() : Func("mcs_isnull") {}
/* /*
* Destructor. IDB_add does not need to do anything here to clean up. * Destructor. MCS_add does not need to do anything here to clean up.
*/ */
virtual ~IDB_isnull() {} virtual ~MCS_isnull() {}
/** /**
* Decide on the function's operation type * Decide on the function's operation type
@ -301,7 +301,7 @@ public:
execplan::CalpontSystemCatalog::ColType& op_ct); execplan::CalpontSystemCatalog::ColType& op_ct);
/** /**
* Returns an InfiniDB integer representation of a date result of the function. * Returns an integer representation of a date result of the function.
* *
* Check the date/time functions in ~/utils/funcexp for implementation * Check the date/time functions in ~/utils/funcexp for implementation
* example of this API. * example of this API.
@ -312,7 +312,7 @@ public:
execplan::CalpontSystemCatalog::ColType& op_ct); execplan::CalpontSystemCatalog::ColType& op_ct);
/** /**
* Returns an InfiniDB integer representation of a datetime result of the function. * Returns an integer representation of a datetime result of the function.
* *
* Check the date/time functions in ~/utils/funcexp for implementation * Check the date/time functions in ~/utils/funcexp for implementation
* example of this API. * example of this API.