Talk:Block nested loop
This is referenced in the main SQL article.
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Untitled
This is referenced in the main SQL article.
is block hashing optional?
it's unclear if "block nested loop" always uses block hashing. sources show conflicting evidence
a mariadb article identifies "block nested loop" and "block hash join" as distinct, separate algorithms https://mariadb.com/kb/en/block-based-join-algorithms/
a highly cited research paper "join algorithm costs revisited" specifies blocks are hashed "We assume that the memory based part of the join is based on hashing" https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=733b1e7c0a4d1f12188008e6e6eaa4cb40fd732d
a mysql article on "block nested loop" doesn't mention hashing https://dev.mysql.com/doc/refman/8.4/en/bnl-bka-optimization.html#bnl-optimization
what do you think? Neilc, TiMike is block hashing optional or mandatory in block nested loops? in theory and in practice
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