What is the theory behind a Calgary join?

[jjermano]

Hey All,

Does anyone know of any resources outlining the Calgary Join tool join algorithm or how it employs its indexes when joining data? The Alteryx Docs don't seem to go into much detail, and I've been unable to find anything more specific. 

Thanks!

[Raj]

 Calgary Join Tool (alteryx.com)
have you gone through this?