[HACKERS] Adding Zigzag Merge Join to Index Nested Loops Join

[tubadzin]

Hi.
I want add Zigzag Merge join to Index Nested Loops Join alghoritm.
http://www.cs.berkeley.edu/~fox/summaries/database/query_eval_5-8.html 
Which files are responsible for Index nested loops join ? (not simple nested 
loops join which has double foreach in nodeNestloop.c) nodeIndexscan.c? 
nodeIndexonlyscan.c?
Best Regards 
Tom