Assignment 2
Aim: implement all variants of SIMC indexing
Implement individual relations and commands to work on them.
Each relation R consists of multiple files:
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R.info ... relation meta-data (e.g. # tuples)
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R.data ... data file containing pages of tuples
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R.tsig ... file containing tuple signatures
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R.psig ... file containing page-level signatures
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R.bsig ... file containing bit-sliced signatures
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