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speed up the join process and postprocessing of SPARQL using GPU or FPGA
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improve the indices and support concurrent reads
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add numeric value query function. need to answer numeric range query efficiently and space consume cannot be too large
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typedef all frequently used types, to avoid inconsistence and high modify cost
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the usability of ghttp(ERROR_CODE, API ...)
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improve socket interface
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docker settings
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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
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mmap to speedup KVstore?
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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