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Leonid Fedorov
@ -16,10 +16,10 @@
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MA 02110-1301, USA. */
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/***********************************************************************
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* $Id$
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*
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* mcsv1_UDAF.h
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***********************************************************************/
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* $Id$
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*
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* mcsv1_UDAF.h
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***********************************************************************/
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/**
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* Columnstore interface for writing a User Defined Aggregate
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@ -74,24 +74,26 @@
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namespace mcsv1sdk
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{
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#define DATATYPE double
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typedef std::map<DATATYPE, uint32_t> MEDIAN_DATA;
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// Override UserData for data storage
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struct MedianData : public UserData
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{
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MedianData() {};
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MedianData(){};
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virtual ~MedianData() {}
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virtual ~MedianData()
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{
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}
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virtual void serialize(messageqcpp::ByteStream& bs) const;
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virtual void unserialize(messageqcpp::ByteStream& bs);
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virtual void serialize(messageqcpp::ByteStream& bs) const;
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virtual void unserialize(messageqcpp::ByteStream& bs);
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MEDIAN_DATA mData;
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private:
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// For now, copy construction is unwanted
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MedianData(UserData&);
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MEDIAN_DATA mData;
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private:
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// For now, copy construction is unwanted
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MedianData(UserData&);
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};
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// Override mcsv1_UDAF to build your User Defined Aggregate (UDAF) and/or
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@ -106,175 +108,174 @@ private:
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// Return the median value of the dataset
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class median : public mcsv1_UDAF
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class median : public mcsv1_UDAF
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{
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public:
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// Defaults OK
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median() : mcsv1_UDAF() {};
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virtual ~median() {};
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public:
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// Defaults OK
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median() : mcsv1_UDAF(){};
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virtual ~median(){};
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/**
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* init()
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*
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* Mandatory. Implement this to initialize flags and instance
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* data. Called once per SQL statement. You can do any sanity
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* checks here.
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*
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* colTypes (in) - A vector of ColDataType defining the
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* parameters of the UDA(n)F call. These can be used to decide
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* to override the default return type. If desired, the new
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* return type can be set by context->setReturnType() and
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* decimal scale and precision can be set by context->setScale
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* and context->setPrecision respectively.
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*
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* Return mcsv1_UDAF::ERROR on any error, such as non-compatible
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* colTypes or wrong number of arguments. Else return
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* mcsv1_UDAF::SUCCESS.
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*/
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virtual ReturnCode init(mcsv1Context* context,
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ColumnDatum* colTypes);
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/**
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* init()
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*
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* Mandatory. Implement this to initialize flags and instance
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* data. Called once per SQL statement. You can do any sanity
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* checks here.
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*
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* colTypes (in) - A vector of ColDataType defining the
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* parameters of the UDA(n)F call. These can be used to decide
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* to override the default return type. If desired, the new
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* return type can be set by context->setReturnType() and
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* decimal scale and precision can be set by context->setScale
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* and context->setPrecision respectively.
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*
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* Return mcsv1_UDAF::ERROR on any error, such as non-compatible
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* colTypes or wrong number of arguments. Else return
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* mcsv1_UDAF::SUCCESS.
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*/
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virtual ReturnCode init(mcsv1Context* context, ColumnDatum* colTypes);
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/**
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* reset()
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*
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* Mandatory. Reset the UDA(n)F for a new group, partition or,
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* in some cases, new Window Frame. Do not free any memory
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* allocated by context->setUserDataSize(). The SDK Framework owns
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* that memory and will handle that. Use this opportunity to
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* reset any variables in context->getUserData() needed for the
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* next aggregation. May be called multiple times if running in
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* a ditributed fashion.
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*
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* Use this opportunity to initialize the userData.
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*/
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virtual ReturnCode reset(mcsv1Context* context);
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/**
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* reset()
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*
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* Mandatory. Reset the UDA(n)F for a new group, partition or,
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* in some cases, new Window Frame. Do not free any memory
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* allocated by context->setUserDataSize(). The SDK Framework owns
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* that memory and will handle that. Use this opportunity to
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* reset any variables in context->getUserData() needed for the
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* next aggregation. May be called multiple times if running in
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* a ditributed fashion.
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*
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* Use this opportunity to initialize the userData.
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*/
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virtual ReturnCode reset(mcsv1Context* context);
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/**
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* nextValue()
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*
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* Mandatory. Handle a single row.
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*
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* colsIn - A vector of data structure describing the input
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* data.
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*
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* This function is called once for every row in the filtered
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* result set (before aggregation). It is very important that
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* this function is efficient.
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*
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* If the UDAF is running in a distributed fashion, nextValue
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* cannot depend on order, as it will only be called for each
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* row found on the specific PM.
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*
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* valsIn (in) - a vector of the parameters from the row.
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*/
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virtual ReturnCode nextValue(mcsv1Context* context, ColumnDatum* valsIn);
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/**
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* nextValue()
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*
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* Mandatory. Handle a single row.
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*
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* colsIn - A vector of data structure describing the input
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* data.
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*
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* This function is called once for every row in the filtered
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* result set (before aggregation). It is very important that
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* this function is efficient.
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*
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* If the UDAF is running in a distributed fashion, nextValue
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* cannot depend on order, as it will only be called for each
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* row found on the specific PM.
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*
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* valsIn (in) - a vector of the parameters from the row.
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*/
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virtual ReturnCode nextValue(mcsv1Context* context, ColumnDatum* valsIn);
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/**
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* subEvaluate()
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*
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* Mandatory -- Called if the UDAF is running in a distributed
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* fashion. Columnstore tries to run all aggregate functions
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* distributed, depending on context.
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*
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* Perform an aggregation on rows partially aggregated by
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* nextValue. Columnstore calls nextValue for each row on a
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* given PM for a group (GROUP BY). subEvaluate is called on the
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* UM to consolodate those values into a single instance of
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* userData. Keep your aggregated totals in context's userData.
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* The first time this is called for a group, reset() would have
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* been called with this version of userData.
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*
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* Called for every partial data set in each group in GROUP BY.
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*
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* When subEvaluate has been called for all subAggregated data
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* sets, Evaluate will be called with the same context as here.
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*
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* valIn (In) - This is a pointer to a memory block of the size
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* set in setUserDataSize. It will contain the value of userData
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* as seen in the last call to NextValue for a given PM.
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*
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*/
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virtual ReturnCode subEvaluate(mcsv1Context* context, const UserData* valIn);
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/**
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* subEvaluate()
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*
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* Mandatory -- Called if the UDAF is running in a distributed
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* fashion. Columnstore tries to run all aggregate functions
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* distributed, depending on context.
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*
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* Perform an aggregation on rows partially aggregated by
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* nextValue. Columnstore calls nextValue for each row on a
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* given PM for a group (GROUP BY). subEvaluate is called on the
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* UM to consolodate those values into a single instance of
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* userData. Keep your aggregated totals in context's userData.
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* The first time this is called for a group, reset() would have
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* been called with this version of userData.
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*
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* Called for every partial data set in each group in GROUP BY.
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*
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* When subEvaluate has been called for all subAggregated data
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* sets, Evaluate will be called with the same context as here.
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*
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* valIn (In) - This is a pointer to a memory block of the size
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* set in setUserDataSize. It will contain the value of userData
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* as seen in the last call to NextValue for a given PM.
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*
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*/
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virtual ReturnCode subEvaluate(mcsv1Context* context, const UserData* valIn);
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/**
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* evaluate()
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*
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* Mandatory. Get the aggregated value.
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*
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* Called for every new group if UDAF GROUP BY, UDAnF partition
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* or, in some cases, new Window Frame.
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*
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* Set the aggregated value into valOut. The datatype is assumed
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* to be the same as that set in the init() function;
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*
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* If the UDAF is running in a distributed fashion, evaluate is
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* called after a series of subEvaluate calls.
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*
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* valOut (out) - Set the aggregated value here. The datatype is
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* assumed to be the same as that set in the init() function;
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*
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* To return a NULL value, don't assign to valOut.
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*/
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virtual ReturnCode evaluate(mcsv1Context* context, static_any::any& valOut);
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/**
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* evaluate()
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*
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* Mandatory. Get the aggregated value.
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*
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* Called for every new group if UDAF GROUP BY, UDAnF partition
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* or, in some cases, new Window Frame.
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*
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* Set the aggregated value into valOut. The datatype is assumed
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* to be the same as that set in the init() function;
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*
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* If the UDAF is running in a distributed fashion, evaluate is
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* called after a series of subEvaluate calls.
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*
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* valOut (out) - Set the aggregated value here. The datatype is
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* assumed to be the same as that set in the init() function;
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*
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* To return a NULL value, don't assign to valOut.
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*/
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virtual ReturnCode evaluate(mcsv1Context* context, static_any::any& valOut);
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/**
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* dropValue()
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*
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* Optional -- If defined, the server will call this instead of
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* reset for UDAnF.
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*
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* Don't implement if a UDAnF has one or more of the following:
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* The UDAnF can't be used with a Window Frame
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* The UDAnF is not reversable in some way
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* The UDAnF is not interested in optimal performance
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*
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* If not implemented, reset() followed by a series of
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* nextValue() will be called for each movement of the Window
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* Frame.
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*
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* If implemented, then each movement of the Window Frame will
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* result in dropValue() being called for each row falling out
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* of the Frame and nextValue() being called for each new row
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* coming into the Frame.
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*
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* valsDropped (in) - a vector of the parameters from the row
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* leaving the Frame
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*
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* dropValue() will not be called for unbounded/current row type
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* frames, as those are already optimized.
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*/
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virtual ReturnCode dropValue(mcsv1Context* context, ColumnDatum* valsDropped);
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/**
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* dropValue()
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*
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* Optional -- If defined, the server will call this instead of
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* reset for UDAnF.
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*
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* Don't implement if a UDAnF has one or more of the following:
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* The UDAnF can't be used with a Window Frame
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* The UDAnF is not reversable in some way
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* The UDAnF is not interested in optimal performance
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*
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* If not implemented, reset() followed by a series of
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* nextValue() will be called for each movement of the Window
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* Frame.
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*
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* If implemented, then each movement of the Window Frame will
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* result in dropValue() being called for each row falling out
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* of the Frame and nextValue() being called for each new row
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* coming into the Frame.
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*
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* valsDropped (in) - a vector of the parameters from the row
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* leaving the Frame
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*
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* dropValue() will not be called for unbounded/current row type
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* frames, as those are already optimized.
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*/
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virtual ReturnCode dropValue(mcsv1Context* context, ColumnDatum* valsDropped);
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/**
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* createUserData()
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*
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* Optional -- If defined, the server will call this instead of
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* createUserData on context.
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*
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* Create your variable length data structure via
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* data = new <datatype>
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*
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* The data structure may contain references to containers or
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* pointers to other objects. Remember that for distributed
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* processing, this may be called multiple times for variaous
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* computing blocks. At the least, it will be called once per PM
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* that processes the data, and once more for the UM. For UDAnF,
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* it may only be called once.
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*
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* Set length to the length of the data structure you create.
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*
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* For each call to createUserData(), there will be a
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* corresponding deleteUserData() where you must clean up. Any
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* memory leaks are your fault.
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*
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*/
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virtual ReturnCode createUserData(UserData*& data, int32_t& length);
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protected:
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/**
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* createUserData()
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*
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* Optional -- If defined, the server will call this instead of
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* createUserData on context.
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*
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* Create your variable length data structure via
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* data = new <datatype>
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*
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* The data structure may contain references to containers or
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* pointers to other objects. Remember that for distributed
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* processing, this may be called multiple times for variaous
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* computing blocks. At the least, it will be called once per PM
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* that processes the data, and once more for the UM. For UDAnF,
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* it may only be called once.
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*
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* Set length to the length of the data structure you create.
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*
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* For each call to createUserData(), there will be a
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* corresponding deleteUserData() where you must clean up. Any
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* memory leaks are your fault.
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*
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*/
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virtual ReturnCode createUserData(UserData*& data, int32_t& length);
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protected:
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};
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}; // namespace
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}; // namespace mcsv1sdk
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#undef EXPORT
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#endif // HEADER_median.h
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#endif // HEADER_median.h
|
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Block a user