ibis::joinIN Class Reference

FastBit In-memory Natual Join. More...

#include <joinin.h>

Inheritance diagram for ibis::joinIN:

List of all members.

Classes
class	result
Public Member Functions
virtual void	estimate (uint64_t &nmin, uint64_t &nmax)
	Provide an estimate of the number of results.
virtual int64_t	evaluate ()
	Compute the number of results.
	joinIN (const ibis::part &partr, const ibis::part &parts, const char *colname, const char *condr, const char *conds)
virtual ibis::join::result *	select (const std::vector< const char * > &colnames)
	Produce a projection of the joined table.
Static Protected Member Functions
static void	freeBuffer (void *buffer, ibis::TYPE_T type)
Protected Attributes
const ibis::column *	colR_
const ibis::column *	colS_
std::string	desc_
ibis::bitvector	maskR_
ibis::bitvector	maskS_
int64_t	nrows
array_t< uint32_t > *	orderR_
array_t< uint32_t > *	orderS_
const ibis::part &	R_
const ibis::part &	S_
void *	valR_
void *	valS_
Friends
class	ibis::joinIN::result

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Detailed Description

FastBit In-memory Natual Join.

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Member Function Documentation

void ibis::joinIN::estimate	(	uint64_t &	nmin,
		uint64_t &	nmax
	)		[virtual]

Provide an estimate of the number of results.

It never fails. In the worst case, it will simply set the minimum (nmin) to 0 and the maximum (nmax) to the maximum possible number of results.

Implements ibis::join.

int64_t ibis::joinIN::evaluate

(

)

[virtual]

Compute the number of results.

This function provide the exact answer. If it fails to do so, it will return a negative number to indicate error.

Implements ibis::join.

References ibis::BYTE, ibis::CATEGORY, ibis::DOUBLE, ibis::FLOAT, ibis::gVerbose, ibis::INT, ibis::LONG, ibis::SHORT, ibis::util::sortMerge(), ibis::TEXT, ibis::UBYTE, ibis::UINT, ibis::ULONG, and ibis::USHORT.

ibis::join::result * ibis::joinIN::select

(

const std::vector< const char * > &

colnames

)

[virtual]

Produce a projection of the joined table.

The column names specified should be of the form "part-name.column-name". If a dot ('.') is not present or the string before the dot is not the name of one of the two partitions, the whole string is taken to be a column name. In which case, we first look in partition partr for the named column, then in partition parts. A nil pointer will be returned if some names can not be found in the two partitions.

Implements ibis::join.

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

• joinin.h
• joinin.cpp