exp4

customer.tbl 和nation.tbl 更改为10行和行，因为目前nestloopjoin的结果会溢出，如果不需要调用nestloopjoin可以用原来的数据，否则要重新下载两个表。
createTable里调用createFileSpace函数，创建文件空间，创建数组字典。 deleteTable按表名删除表文件，回收相应的外存空间。

Name		Name	Last commit message	Last commit date
Latest commit History 59 Commits
Buffer.cpp		Buffer.cpp
Buffer.h		Buffer.h
Makefile		Makefile
README.md		README.md
b_plus_tree.cpp		b_plus_tree.cpp
b_plus_tree.h		b_plus_tree.h
bit.cpp		bit.cpp
buffManage.cpp		buffManage.cpp
compile.sh		compile.sh
createTable.cpp		createTable.cpp
createTable.h		createTable.h
cursor.cpp		cursor.cpp
cursor.cpp~		cursor.cpp~
cursor.h		cursor.h
cursorForTmptable.cpp		cursorForTmptable.cpp
cursorForTmptable.cpp~		cursorForTmptable.cpp~
cursorForTmptable.h		cursorForTmptable.h
customer.tbl		customer.tbl
dataDictionary.cpp		dataDictionary.cpp
dataDictionary.h		dataDictionary.h
dbHead.h		dbHead.h
define.h		define.h
deleteAllTuples.cpp		deleteAllTuples.cpp
deleteAllTuples.h		deleteAllTuples.h
deleteRecords.cpp		deleteRecords.cpp
deleteRecords.cpp~		deleteRecords.cpp~
deleteRecords.h		deleteRecords.h
diskOpt.cpp		diskOpt.cpp
dropTable.cpp		dropTable.cpp
dropTable.h		dropTable.h
err.cpp		err.cpp
err.h		err.h
file.h		file.h
fileOpt.cpp		fileOpt.cpp
filter.cpp		filter.cpp
filter.cpp~		filter.cpp~
filter.h		filter.h
getaRecordbyCursor.cpp		getaRecordbyCursor.cpp
getaRecordbyCursor.h		getaRecordbyCursor.h
indexOpt.cpp		indexOpt.cpp
indexOpt.h		indexOpt.h
init.cpp		init.cpp
insertOneRecord.cpp		insertOneRecord.cpp
insertOneRecord.h		insertOneRecord.h
insertOneTuple.cpp		insertOneTuple.cpp
insertOneTuple.h		insertOneTuple.h
join.cpp		join.cpp
join.h		join.h
join_Hashjoin.h		join_Hashjoin.h
join_hashjoin.cpp		join_hashjoin.cpp
join_indexjoin.cpp		join_indexjoin.cpp
join_indexjoin.h		join_indexjoin.h
lex.yy.c		lex.yy.c
lexical-analysis.l		lexical-analysis.l
loaddata.cpp		loaddata.cpp
loaddata.h		loaddata.h
nation.tbl		nation.tbl
nestloop.cpp		nestloop.cpp
nestloop.h		nestloop.h
printTempTable.cpp		printTempTable.cpp
printTempTable.h		printTempTable.h
project.cpp		project.cpp
project.h		project.h
recorder_char_general.cpp		recorder_char_general.cpp
recorder_char_general.h		recorder_char_general.h
region.tbl		region.tbl
show.cpp		show.cpp
sortmergejoin.cpp		sortmergejoin.cpp
sortmergejoin.h		sortmergejoin.h
syntactic-analysis.y		syntactic-analysis.y
tableScan.cpp		tableScan.cpp
tableScan.h		tableScan.h
test.cpp		test.cpp
test.cpp~		test.cpp~
test.txt		test.txt
update.cpp		update.cpp
y.tab.c		y.tab.c
y.tab.h		y.tab.h

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