ibis::liga Class Reference

A specialization of class mensa. More...

#include <mensa.h>

Inheritance diagram for ibis::liga:

Public Member Functions
virtual int	addPartition (const char *)
	The list of partitions in this class can NOT be expanded or otherwise modified. More...
	liga (ibis::part &)
	Create an object from an externally managed data partition.
	liga (const ibis::partList &)
	Create an object from an external list of data partitions. More...
	~liga ()
	Ibis::liga does not own the data partitions and does not free the resources in those partitions. More...
Public Member Functions inherited from ibis::mensa
virtual int	backup (const char *dir, const char *tname=0, const char *tdesc=0) const
	Write the current content to the specified output directory in the raw binary format. More...
virtual int	buildIndex (const char *, const char *)
	The following functions deal with auxillary data for accelerating query processing, primarily for building indexes. More...
virtual int	buildIndexes (const char *)
	Create indexes for every column of the table. More...
virtual int	buildIndexes (const ibis::table::stringArray &)
	The following functions deal with auxillary data for accelerating query processing, primarily for building indexes. More...
virtual stringArray	columnNames () const
	Return the column names in a list. More...
virtual typeArray	columnTypes () const
	Return the column types in a list.
virtual ibis::table::cursor *	createCursor () const
	Create a cursor object to perform row-wise data access.
virtual void	describe (std::ostream &) const
	!< Return data types. More...
virtual int	dropPartition (const char *)
	Remove the named data partition from this data table. More...
virtual int	dump (std::ostream &, const char *) const
	Print the values in ASCII form to the specified output stream. More...
virtual int	dump (std::ostream &, uint64_t, const char *) const
	Print the first nr rows.
virtual int	dump (std::ostream &, uint64_t, uint64_t, const char *) const
	Print nr rows starting with row offset. More...
virtual void	dumpNames (std::ostream &, const char *) const
	Print all column names on one line.
virtual void	estimate (const char *cond, uint64_t &nmin, uint64_t &nmax) const
	Estimate the number of rows satisfying the selection conditions. More...
virtual void	estimate (const ibis::qExpr *cond, uint64_t &nmin, uint64_t &nmax) const
	Estimate the number of rows satisfying the selection conditions. More...
virtual int64_t	getColumnAsBytes (const char *, char *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsDoubles (const char *, double *, uint64_t=0, uint64_t=0) const
virtual int64_t	getColumnAsDoubles (const char *, std::vector< double > &, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsFloats (const char *, float *, uint64_t=0, uint64_t=0) const
virtual int64_t	getColumnAsInts (const char *, int32_t *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsLongs (const char *, int64_t *, uint64_t=0, uint64_t=0) const
virtual int64_t	getColumnAsOpaques (const char *, std::vector< ibis::opaque > &, uint64_t=0, uint64_t=0) const
	Retrieve the blobs as ibis::opaque objects. More...
virtual int64_t	getColumnAsShorts (const char *, int16_t *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsStrings (const char *, std::vector< std::string > &, uint64_t=0, uint64_t=0) const
	Convert values to their string form. More...
virtual int64_t	getColumnAsUBytes (const char *, unsigned char *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsUInts (const char *, uint32_t *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual int64_t	getColumnAsULongs (const char *, uint64_t *, uint64_t=0, uint64_t=0) const
virtual int64_t	getColumnAsUShorts (const char *, uint16_t *, uint64_t=0, uint64_t=0) const
	Retrieve all values of the named column. More...
virtual double	getColumnMax (const char *) const
	Compute the maximum of all valid values in the name column. More...
virtual double	getColumnMin (const char *) const
	Compute the minimum of all valid values in the name column. More...
virtual long	getHistogram (const char *, const char *, double, double, double, std::vector< uint32_t > &) const
virtual long	getHistogram2D (const char *, const char *, double, double, double, const char *, double, double, double, std::vector< uint32_t > &) const
	Compute a two-dimension histogram on columns cname1 and cname2. More...
virtual long	getHistogram3D (const char *, const char *, double, double, double, const char *, double, double, double, const char *, double, double, double, std::vector< uint32_t > &) const
	Compute a three-dimensional histogram on the named columns. More...
virtual int	getPartitions (ibis::constPartList &) const
	Retrieve the list of partitions.
virtual table *	groupby (const stringArray &) const
	Directly performing group-by on the base data (without selection) is not currently supported. More...
virtual table *	groupby (const char *) const
	Directly performing group-by on the base data (without selection) is not currently supported. More...
virtual const char *	indexSpec (const char *) const
	Retrieve the current indexing option. More...
virtual void	indexSpec (const char *, const char *)
	Replace the current indexing option. More...
	mensa (const char *dir)
	This function expects a valid data directory to find data partitions. More...
	mensa (const char *dir1, const char *dir2)
	This function expects a pair of data directories to define data partitions. More...
virtual int	mergeCategories (const ibis::table::stringArray &)
	Merge the dictionaries of categorical value from different data partitions. More...
virtual uint32_t	nColumns () const
	Number of columns. More...
virtual uint64_t	nRows () const
	The number of rows in this table.
virtual void	orderby (const stringArray &, const std::vector< bool > &)
	Reordering the rows using the specified columns. More...
virtual void	orderby (const stringArray &)
	Reordering the rows using the specified columns. More...
virtual void	orderby (const char *str)
	Reorder the rows. The column names are separated by commas.
virtual void	reverseRows ()
	Reversing the ordering of the rows on disk requires too much work but has no obvious benefit. More...
virtual table *	select (const char *sel, const char *cond) const
	Given a set of column names and a set of selection conditions, compute another table that represents the selected values. More...
virtual table *	select2 (const char *sel, const char *cond, const char *pts) const
	A variation of the function select defined in ibis::table. More...
Public Member Functions inherited from ibis::table
virtual const char *	description () const
	Free text description. May return a null pointer.
virtual const char *	name () const
	Name of the table. More...
virtual table *	select (const char *sel, const ibis::qExpr *cond) const
	Process the selection conditions and generate another table to hold the answer. More...
virtual	~table ()
	Destructor.

Additional Inherited Members
Public Types inherited from ibis::table
typedef ibis::array_t< void * >	bufferArray
	A list to hold the in-memory buffers. More...
typedef std::map< const char *, ibis::TYPE_T, ibis::lessi >	namesTypes
	An associative array of names and types.
typedef ibis::array_t< const char * >	stringArray
	A list of strings. More...
typedef std::vector< const char * >	stringVector
typedef ibis::array_t< ibis::TYPE_T >	typeArray
	A list of data types.
Static Public Member Functions inherited from ibis::table
static void *	allocateBuffer (ibis::TYPE_T, size_t)
	Allocate a buffer of the specified type and size.
static int64_t	computeHits (const ibis::constPartList &parts, const char *cond)
	Compute the number of rows satisfying the specified conditions. More...
static int64_t	computeHits (const ibis::constPartList &parts, const ibis::qExpr *cond)
	Compute the number of rows satisfying the specified query expression. More...
static void	consecrateName (char *)
	Remove unallowed characters from the given string to produce a valid column name. More...
static ibis::table *	create (ibis::part &)
	Create a simple of container of a partition. More...
static ibis::table *	create (const ibis::partList &)
	Create a container of externally managed data partitions. More...
static ibis::table *	create (const char *dir)
	Create a table object from the specified data directory. More...
static ibis::table *	create (const char *dir1, const char *dir2)
	Create a table object from a pair of data directories. More...
static void	freeBuffer (void *buffer, ibis::TYPE_T type)
	Freeing a buffer for storing in-memory values. More...
static void	freeBuffers (bufferArray &, typeArray &)
	Freeing a list of buffers. More...
static bool	isValidName (const char *)
	Is the given string a valid FastBit name for a data column?
static void	parseNames (char *in, stringVector &out)
	Parse the incoming string into a set of names. More...
static void	parseNames (char *in, stringArray &out)
	Parse the incoming string into a set of names. More...
static void	parseOrderby (char *in, stringArray &out, std::vector< bool > &direc)
	Parse the incoming string as an order-by clause. More...
static table *	select (const ibis::constPartList &parts, const char *sel, const char *cond)
	Perform the select operation on a list of data partitions. More...
static table *	select (const ibis::constPartList &parts, const char *sel, const ibis::qExpr *cond)
	Perform select operation using a user-supplied query expression. More...
Protected Member Functions inherited from ibis::mensa
void	clear ()
	Clear the existing content.
int64_t	computeHits (const char *cond) const
	Compute the number of hits.
Protected Member Functions inherited from ibis::table
	table ()
	!< Description of the table. More...
	table (const char *na, const char *de)
	Constructor. Use the user-supplied name and description.
Protected Attributes inherited from ibis::mensa
ibis::table::namesTypes	naty
	A combined list of columns names.
uint64_t	nrows
ibis::partList	parts
	List of data partitions.
Protected Attributes inherited from ibis::table
std::string	desc_
	!< Name of the table.
std::string	name_

Detailed Description

A specialization of class mensa.

It holds a list of data partitions but does not own them. It does not create these partitions nor delete them. It inherits the public functions of mensa without making any additions or modifications.

Note

About the name: Liga is the Danish translation of the term "league table." Oh, well, guess we are running out short names for a table.

Constructor & Destructor Documentation

ibis::liga::liga

(

const ibis::partList &

l

)

Create an object from an external list of data partitions.

Note that this object does not own the partitions and is not reponsible for freeing the partitions. It merely provide a container for the partitions so that one can use the ibis::table API.

References ibis::table::desc_, liga(), ibis::mensa::naty, and ibis::mensa::parts.

ibis::liga::~liga

(

)

Ibis::liga does not own the data partitions and does not free the resources in those partitions.

References ibis::mensa::parts.

Member Function Documentation

virtual int ibis::liga::addPartition ( const char *  )

inlinevirtual

The list of partitions in this class can NOT be expanded or otherwise modified.

Reimplemented from ibis::mensa.

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The documentation for this class was generated from the following files:

• mensa.h
• mensa.cpp