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row-based transforms are separate from key-based transforms
- To: http://www.edge_spring.com/~robert
- Subject: row-based transforms are separate from key-based transforms
- From: http://dummy.us.eu.org/robert (Robert)
- Date: Tue, 01 Jan 2013 09: -0800
row-based transforms
row_transform([E1, Q1, MT1], [E2, Q2, MT2] ...) => [[E1, MT1], [E2, MT2] ... ]
KQ = key query
key transforms
key_transform([E1, KQ1, K1], [E2, KQ2, K2], ...) => [E1, E2, ...]
write transform result
write_transform([E1, MT1], [E2, MT2], ...) => [E1, E2, ...]
review how to compose row transforms
also, figure out whether key-based transforms should output a map table