A trivial class for a table with no columns. More...

#include <tab.h>

Inheritance diagram for ibis::tabula:

Classes
class	cursor

Public Member Functions
virtual int	backup (const char , const char =0, const char *=0) const
	The backup function. It does nothing.

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

virtual typeArray	columnTypes () const
	!< Return column names.

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	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
	Retrieve all values of the named column. More...

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
	Retrieve all values of the named column. More...

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
	Retrieve all values of the named column. More...

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
	Retrieve the null-terminated strings as a vector of std::string objects. 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
	Retrieve all values of the named column. More...

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 table *	groupby (const stringArray &) const
	Perform aggregate functions on the current table. More...

virtual table *	groupby (const char *) const
	Perform a group-by operation. 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...

virtual uint32_t	nColumns () const
	The number of columns in this table.

virtual uint64_t	nRows () const
	The number of rows in this table.

virtual void	orderby (const stringArray &, const std::vector< bool > &)

virtual void	orderby (const stringArray &)
	Reorder the rows. More...

virtual void	orderby (const char *)
	Reorder the rows. The column names are separated by commas.

virtual void	reverseRows ()
	Reverse the order of the rows.

virtual table *	select (const char , const char ) const
	Given a set of column names and a set of selection conditions, compute another table that represents the selected values. More...

	tabula (const char na, const char de, uint64_t nr)

	tabula (uint64_t nr=0)

Public Member Functions inherited from ibis::table
virtual int	addPartition (const char *)
	Add a data partition defined in the named directory. More...

virtual const char *	description () const
	Free text description. May return a null pointer.

virtual int	dropPartition (const char *)
	Remove the named data partition from this data table. More...

virtual int	getPartitions (ibis::constPartList &) const
	Retrieve the list of partitions.

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.

virtual int	mergeCategories (const stringArray &)
	Merge the dictionaries of categorical value from different data partitions. More...

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::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::table
std::string	desc_
	!< Name of the table.

std::string	name_

Detailed Description

A trivial class for a table with no columns.

This type of table is generated when the select clause is blank or not specified. It is also used to represent an empty table with zero rows.

Member Function Documentation

virtual int ibis::tabula::buildIndex	(	const char *	colname,
		const char *	option
	)

inlinevirtual

The following functions deal with auxillary data for accelerating query processing, primarily for building indexes.

Create the index for the named column. The existing index will be replaced. If an indexing option is not specified, it will use the internally recorded option for the named column or the table containing the column.

Note: Unless there is a specific instruction to not index a column, the querying functions will automatically build indexes as necessary. However, as building an index is relatively expensive, building an index on a column is on average about four or five times as expensive as reading the column from disk, this function is provided to build indexes beforehand.

Implements ibis::table.

virtual int ibis::tabula::buildIndexes ( const char * options )

inlinevirtual

Create indexes for every column of the table.

Existing indexes will be replaced. If an indexing option is not specified, the internally recorded options will be used.

See also: buildIndex

Implements ibis::table.

virtual int ibis::tabula::buildIndexes ( const ibis::table::stringArray & )

inlinevirtual

The following functions deal with auxillary data for accelerating query processing, primarily for building indexes.

Create the index for the named column. The existing index will be replaced. If an indexing option is not specified, it will use the internally recorded option for the named column or the table containing the column.

Note: Unless there is a specific instruction to not index a column, the querying functions will automatically build indexes as necessary. However, as building an index is relatively expensive, building an index on a column is on average about four or five times as expensive as reading the column from disk, this function is provided to build indexes beforehand.

Implements ibis::table.

void ibis::tabula::describe ( std::ostream & ) const

inlinevirtual

!< Return data types.

Print a description of the table to the specified output stream.

Implements ibis::table.

virtual int ibis::tabula::dump	(	std::ostream &	out,
		const char *	del
	)		const

inlinevirtual

Print the values in ASCII form to the specified output stream.

The default delimiter is coma (","), which produces Comma-Separated-Values (CSV).

Implements ibis::table.

virtual int ibis::tabula::dump	(	std::ostream &	out,
		uint64_t	offset,
		uint64_t	nr,
		const char *	del
	)		const

inlinevirtual

Print nr rows starting with row offset.

Note that the row number starts with 0, i.e., the first row is row 0.

Implements ibis::table.

void ibis::tabula::estimate	(	const char *	cond,
		uint64_t &	nmin,
		uint64_t &	nmax
	)		const

inlinevirtual

Estimate the number of rows satisfying the selection conditions.

The number of rows is between [nmin, nmax] (inclusive).

Implements ibis::table.

void ibis::tabula::estimate	(	const ibis::qExpr *	cond,
		uint64_t &	nmin,
		uint64_t &	nmax
	)		const

inlinevirtual

Estimate the number of rows satisfying the selection conditions.

The number of rows is between [nmin, nmax] (inclusive).

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsBytes	(	const char *	cname,
		char *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsDoubles	(	const char *	cname,
		double *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsDoubles	(	const char *	cname,
		std::vector< double > &	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsFloats	(	const char *	cname,
		float *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsInts	(	const char *	cname,
		int32_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsLongs	(	const char *	cname,
		int64_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsOpaques	(	const char *	cname,
		std::vector< ibis::opaque > &	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve the blobs as ibis::opaque objects.

Only work on the column type BLOB.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsShorts	(	const char *	cname,
		int16_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsStrings	(	const char *	cname,
		std::vector< std::string > &	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve the null-terminated strings as a vector of std::string objects.

Both ibis::CATEGORY and ibis::TEXT types can be retrieved using this function.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsUBytes	(	const char *	cname,
		unsigned char *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsUInts	(	const char *	cname,
		uint32_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsULongs	(	const char *	cname,
		uint64_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual int64_t ibis::tabula::getColumnAsUShorts	(	const char *	cname,
		uint16_t *	vals,
		uint64_t	begin = `0`,
		uint64_t	end = `0`
	)		const

inlinevirtual

Retrieve all values of the named column.

The member functions of this class only support access to one column at a time. Use table::cursor class for row-wise accesses.

The arguments begin and end are given in row numbers starting from 0. If begin < end, then rows begin till end-1 are packed into the output array. If 0 == end (i.e., leaving end as the default value), then the values from begin till end of the table is packed into the output array. The default values where both begin and end are 0 define a range covering all rows of the table.

These functions return the number of elements copied upon successful completion, otherwise they return a negative number to indicate failure.

Note: For fixed-width data types, the raw pointers are used to point to the values to be returned. In these cases, the caller is responsible for allocating enough storage for the values to be returned.

Implements ibis::table.

virtual double ibis::tabula::getColumnMax ( const char * cname ) const

inlinevirtual

Compute the maximum of all valid values in the name column.

In case of error, such as an invalid column name or an empty table, this function will return FASTBIT_DOUBLE_NULL or -DBL_MAX to ensure that the following test fails getColumnMin <= getColumnMax.

Implements ibis::table.

virtual double ibis::tabula::getColumnMin ( const char * cname ) const

inlinevirtual

Compute the minimum of all valid values in the name column.

In case of error, such as an invalid column name or an empty table, this function will return FASTBIT_DOUBLE_NULL or DBL_MAX to ensure that the following test fails getColumnMin <= getColumnMax.

Implements ibis::table.

virtual long ibis::tabula::getHistogram	(	const char *	constraints,
		const char *	cname,
		double	begin,
		double	end,
		double	stride,
		std::vector< uint32_t > &	counts
	)		const

inlinevirtual

Compute the histogram of the named column. This version uses the user specified bins:

[begin, begin+stride) [begin+stride, begin+2*stride) ....

A record is placed in bin

(x - begin) / stride,

where the first bin is bin 0. The total number of bins is

1 + floor((end - begin) / stride).

Note: Records (rows) outside of the range [begin, end] are not counted.; Non-positive stride is considered as an error.; If end is less than begin, an empty array counts is returned along with return value 0.

Implements ibis::table.

virtual long ibis::tabula::getHistogram2D	(	const char *	constraints,
		const char *	cname1,
		double	begin1,
		double	end1,
		double	stride1,
		const char *	cname2,
		double	begin2,
		double	end2,
		double	stride2,
		std::vector< uint32_t > &	counts
	)		const

inlinevirtual

Compute a two-dimension histogram on columns cname1 and cname2.

The bins along each dimension are defined the same way as in function getHistogram. The array counts stores the two-dimensional bins with the first dimension as the slow varying dimension following C convention for ordering multi-dimensional arrays.

Implements ibis::table.

virtual long ibis::tabula::getHistogram3D	(	const char *	constraints,
		const char *	cname1,
		double	begin1,
		double	end1,
		double	stride1,
		const char *	cname2,
		double	begin2,
		double	end2,
		double	stride2,
		const char *	cname3,
		double	begin3,
		double	end3,
		double	stride3,
		std::vector< uint32_t > &	counts
	)		const

inlinevirtual

Compute a three-dimensional histogram on the named columns.

The triplets <begin, end, stride> are used the same ways in getHistogram and getHistogram2D. The three dimensional bins are linearized in counts with the first being the slowest varying dimension and the third being the fastest varying dimension following the C convention for ordering multi-dimensional arrays.

Implements ibis::table.

virtual table* ibis::tabula::groupby ( const stringArray & ) const

inlinevirtual

Perform aggregate functions on the current table.

It produces a new table. The list of strings passed to this function are interpreted as a set of names followed by a set of functions. Currently, only functions COUNT, AVG, MIN, MAX, SUM, VARPOP, VARSAMP, STDPOP, STDSAMP and DISTINCT are supported, and the functions can only accept a column name as arguments.

Implements ibis::table.

virtual table* ibis::tabula::groupby ( const char * str ) const

inlinevirtual

Perform a group-by operation.

The column names and operations are separated by commas.

Reimplemented from ibis::table.

virtual const char* ibis::tabula::indexSpec ( const char * colname ) const

inlinevirtual

Retrieve the current indexing option.

If no column name is specified, it retrieve the indexing option for the table.

Implements ibis::table.

virtual void ibis::tabula::indexSpec	(	const char *	opt,
		const char *	colname
	)

inlinevirtual

Replace the current indexing option.

If no column name is specified, it resets the indexing option for the table.

Implements ibis::table.

virtual void ibis::tabula::orderby ( const stringArray & )

inlinevirtual

Reorder the rows.

Sort the rows in ascending order of the columns specified in the list of column names. This function is not designated const even though it does not change the content in SQL logic, but it may change internal representations.

Note: If an empty list is passed to this function, it will reorder rows using all columns with the column having the smallest number of distinct values first.

Implements ibis::table.

virtual table* ibis::tabula::select	(	const char *	sel,
		const char *	cond
	)		const

inlinevirtual

Given a set of column names and a set of selection conditions, compute another table that represents the selected values.

Implements ibis::table.

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

tab.h



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