implement a set of relational operations, specifically: SelectPipe, SelectFile, Project, Join, DuplicateRemoval, Sum, GroupBy, and WriteOut.

a3test
......\.cproject
......\.project
......\.settings
......\.........\.svn
......\.........\....\all-wcprops
......\.........\....\entries
......\.........\....\prop-base
......\.........\....\props
......\.........\....\text-base
......\.........\....\.........\org.eclipse.cdt.managedbuilder.core.prefs.svn-base
......\.........\....\tmp
......\.........\....\...\prop-base
......\.........\....\...\props
......\.........\....\...\text-base
......\.........\org.eclipse.cdt.managedbuilder.core.prefs
......\.svn
......\....\all-wcprops
......\....\entries
......\....\prop-base
......\....\.........\part.bin.svn-base
......\....\.........\partsupp.bin.svn-base
......\....\.........\supplier.bin.svn-base
......\....\props
......\....\text-base
......\....\.........\.cproject.svn-base
......\....\.........\.project.svn-base
......\....\.........\BigQ.cc.svn-base
......\....\.........\BigQ.h.svn-base
......\....\.........\catalog.svn-base
......\....\.........\Comparison.cc.svn-base
......\....\.........\Comparison.h.svn-base
......\....\.........\ComparisonEngine.cc.svn-base
......\....\.........\ComparisonEngine.h.svn-base
......\....\.........\DBFile.cc.svn-base
......\....\.........\DBFile.h.svn-base
......\....\.........\Defs.h.svn-base
......\....\.........\File.cc.svn-base
......\....\.........\File.h.svn-base
......\....\.........\Function.cc.svn-base
......\....\.........\Function.h.svn-base
......\....\.........\Lexer.l.svn-base
......\....\.........\LexerFunc.l.svn-base
......\....\.........\Makefile.svn-base
......\....\.........\ParseFunc.h.svn-base
......\....\.........\Parser.y.svn-base
......\....\.........\ParserFunc.y.svn-base
......\....\.........\ParseTree.h.svn-base
......\....\.........\part.bin.header.svn-base
......\....\.........\part.bin.svn-base
......\....\.........\partsupp.bin.header.svn-base
......\....\.........\partsupp.bin.svn-base
......\....\.........\Pipe.cc.svn-base
......\....\.........\Pipe.h.svn-base
......\....\.........\ps.w.tmp.svn-base
......\....\.........\README.svn-base
......\....\.........\Record.cc.svn-base
......\....\.........\Record.h.svn-base
......\....\.........\RelOp.cc.svn-base
......\....\.........\RelOp.h.svn-base
......\....\.........\Schema.cc.svn-base
......\....\.........\Schema.h.svn-base
......\....\.........\supplier.bin.header.svn-base
......\....\.........\supplier.bin.svn-base
......\....\.........\test.cat.svn-base
......\....\.........\test.cc.svn-base
......\....\.........\test.h.svn-base
......\....\.........\test.out.stackdump.svn-base
......\....\.........\TwoWayList.cc.svn-base
......\....\.........\TwoWayList.h.svn-base
......\....\tmp
......\....\...\prop-base
......\....\...\props
......\....\...\text-base
......\backup
......\......\.svn
......\......\....\all-wcprops
......\......\....\entries
......\......\....\prop-base
......\......\....\props
......\......\....\text-base
......\......\....\.........\BigQ.cc.svn-base
......\......\....\.........\BigQ.h.svn-base
......\......\....\.........\catalog.svn-base
......\......\....\.........\Comparison.cc.svn-base
......\......\....\.........\Comparison.h.svn-base
......\......\....\.........\ComparisonEngine.cc.svn-base
......\......\....\.........\ComparisonEngine.h.svn-base
......\......\....\.........\DBFile.cc.svn-base
......\......\....\.........\DBFile.h.svn-base
......\......\....\tmp
......\......\....\...\prop-base
......\......\....\...\props
......\......\....\...\text-base
......\......\BigQ.cc
......\......\BigQ.h
......\......\BigQ.o
......\......\catalog
......\......\Comparison.cc
......\......\Comparison.h

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