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speed up the join process and postprocessing of SPARQL using GPU or FPGA
improve the indices and support concurrent reads
add numeric value query function. need to answer numeric range query efficiently and space consume cannot be too large
typedef all frequently used types, to avoid inconsistence and high modify cost
the usability of ghttp(ERROR_CODE, API ...)
improve socket interface
warnings remain in using Parser/(antlr)!(modify sparql.g 1.1 and regenerate). change name to avoid redefine problem(maybe error), or go to use executable to parse
mmap to speedup KVstore?
the strategy for Stream:is 85% valid? consider sampling, analyse the size of result set and decide strategy? how to support order by: sort in memory if not put in file; otherwise, partial sort in memory, then put into file, then proceed external sorting