Tomas Vondra pointed out to me that there's an error in parallel.sgml which confuses the inner and outer sides of the join.
I've attached a patch which fixes this, although I think I'm still missing the point to text's explanation of why Merge Join is not included due to it having to sort the inner side in each worker. Hash join must build a hash table for each worker, so why is that OK by sorting is not? Anyway, I've attached a patch which fixes the outer/inner confusion and cleans up a couple of other grammar mistakes and an omissions regarding DISTINCT and ORDER BY not being supported in parallel aggregate. I ended up rewriting a section too which was explaining parallel aggregate, which I personally believe is a bit more clear to read, but someone else may think otherwise. -- David Rowley http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
parallel_doc_fixes.patch
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