Introduction

This repo contains implementation of sketching algorithms for size of join estimation. The update performance of sketches can be significantly improved if only a sample of the data is sketched, without significant degradation in the accuracy. In this repo, Bernoulli sampling is used. For details of the sampling algorithms and sketching techniques, please checkout the references page.

Prerequisite

Install GSL

If you are using Mac, follow these steps:

1. launch the terminal
2. run
   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
3. run
   brew install gsl

For other systems, please checkout the documentation on GSL

How to run the code

1. run make
2. run ./sketch_bernoulli_sampling.out followed by the following parameters:
   
   dom_size
   
   tuples_no
   
   buckets_no
   
   rows_no
   
   DIST_PARAM
   
   DIST_SHUFF
   
   SAMP_PROB
   
   num_runs

For details of corresponding parameters, please checkout the documentation at GitHub Wiki

1. run make clean to remove all intermediate files.