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authorHelmut Grohne <helmut@subdivi.de>2013-08-02 15:21:56 +0200
committerHelmut Grohne <helmut@subdivi.de>2013-08-02 15:21:56 +0200
commit7528af6d22d3967be9727f6e2d88dfcbf0f78ce9 (patch)
tree40f16ad103c89240cc68f6eaa35d278af42fb9ae /dedup/image.py
parent2712edb550968ce7ec8cd9800241d7944666631a (diff)
downloaddebian-dedup-7528af6d22d3967be9727f6e2d88dfcbf0f78ce9.tar.gz
model comparability as an equivalence relation
webapp has had a relation hash_functions, that modeled "comparable functions". Images should not be compares to other files, since it makes no sense to store them as the RGBA stream, that is being hashed. This comparability property resembles an equivalence relation. So the function table gains a column eqclass. Each class is represented by a number and functions are statically assigned to these classes. Now the filtering happens in SQL instead of Python.
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