MixedDupColumnGenerator Class Reference

Mixed Duplicate column generator. More...

#include <ExecStreamGenerator.h>

Inheritance diagram for MixedDupColumnGenerator:


Public Member Functions
	MixedDupColumnGenerator (int numDupsInit, int startValue=0, int wid=1)
int64_t	next ()
Private Attributes
int	numDups
int64_t	curValue
int	width
int	nextValue
int	initialValue

Detailed Description

Mixed Duplicate column generator.

Generates a mixture of unique rows or duplicate rows of numDups per value for a column, in sequence, starting at initValue:

0, 1, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 7, 8, ...

Definition at line 473 of file ExecStreamGenerator.h.

Constructor & Destructor Documentation

MixedDupColumnGenerator::MixedDupColumnGenerator	(	int	numDupsInit,
		int	startValue = `0`,
		int	wid = `1`
	)			`[inline, explicit]`

Definition at line 482 of file ExecStreamGenerator.h.

References curValue, initialValue, nextValue, numDups, and width.

00486     {
00487         assert(numDupsInit > 0);
00488         numDups = numDupsInit;
00489         curValue = 0;
00490         width = wid;
00491         initialValue = nextValue = startValue;
00492     }

Member Function Documentation

int64_t MixedDupColumnGenerator::next ( ) [inline, virtual]

Implements ColumnGenerator< T >.

Definition at line 494 of file ExecStreamGenerator.h.

References curValue, initialValue, nextValue, numDups, and width.

00495     {
00496         int res;
00497 
00498         if ((((nextValue - initialValue) / width) % 2)) {
00499             res = nextValue + curValue++ / numDups;
00500             if (curValue == numDups) {
00501                 curValue = 0;
00502                 nextValue++;
00503             }
00504         } else {
00505             res = nextValue++;
00506         }
00507 
00508         return res;
00509     }