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merge_join_w_pipelining.py
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merge_join_w_pipelining.py
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paths = ("data/name.basics.tsv/data.tsv",
"data/title.akas.tsv/data.tsv",
"data/title.basics.tsv/data.tsv",
"data/title.crew.tsv/data.tsv",
"data/title.episode.tsv/data.tsv",
"data/title.principals.tsv/data.tsv",
"data/title.ratings.tsv/data.tsv")
fields_limit_per_file = [6, 8, 9, 3, 4, 6, 3]
scan_scan = 0
mj_scan = 1
mj_mj = 2
tconst = 0
first_two_chars = 2
first_two_lines = 2
def show_info():
print("Let's make our generator!")
print("--------")
print("Please choose a combo for iterator's 'merge-join' parameters")
print("0. 'scan' - 'scan'")
print("1. 'merge-join' - 'scan'")
print("2. 'merge-join' - 'merge-join'")
def check_validity_of_answer(answer, down_limit, up_limit):
while answer < down_limit or answer > up_limit:
print("Answer: " +str(answer) + " isn't valid answer")
print("Please enter a valid answer!")
answer = int(input())
return answer
def create_mj_pars(combo_answer):
if combo_answer == scan_scan:
print("--------")
print("Choose 2 files for each scan's file: ")
first_file, second_file = choose_file(True), choose_file(False)
print("--------")
print("Now choose fields: ")
first_fields, second_fields = choose_field(first_file),\
choose_field(second_file)
mj_output_fields_limit = get_mj_fields_limit(first_fields)
mj_output_fields_limit += get_mj_fields_limit(second_fields)
fields_limit_per_file.append(mj_output_fields_limit)
return merge_join(scan(paths[first_file]), scan(paths[second_file]),\
first_fields, second_fields)
elif combo_answer == mj_scan:
print("We will create iterator 'merge-join' as a parameter")
mj_par = create_mj_pars(scan_scan)
print("----------------")
print("Choose 1 file for scan's file: ")
file = choose_file(True)
print("----------------")
print("Now choose fields: ")
last_field = len(fields_limit_per_file) - 1
first_fields, second_fields = choose_field(last_field),\
choose_field(file)
return merge_join(mj_par, scan(paths[file]),\
first_fields, second_fields)
elif combo_answer == mj_mj:
print("We will create iterator 'merge-join' as the first parameter")
mj_first_par = create_mj_pars(scan_scan)
print("----------------")
print("We will create iterator 'merge-join' as the second parameter")
mj_second_par = create_mj_pars(scan_scan)
print("----------------")
print("Now choose fields: ")
prelast_field, last_field = len(fields_limit_per_file) - 2,\
len(fields_limit_per_file) - 1
first_fields, second_fields = choose_field(prelast_field),\
choose_field(last_field)
return merge_join(mj_first_par, mj_second_par, first_fields,\
second_fields)
return False
def choose_file(info_flag):
if info_flag:
print("0. name.basics")
print("1. title.akas")
print("2. title.basics")
print("3. title.crew")
print("4. title.episode")
print("5. title.principals")
print("6. title.ratings")
file = int(input())
file = check_validity_of_answer(file, 0, 6)
return file
def choose_field(file):
print("Field limits for your selecting file: "
+ str(fields_limit_per_file[file]))
print("Choose fields with space after each number" +
" if you want more than one field")
fields = input()
fields = check_fields_validity(fields, file)
return fields
def check_fields_validity(fields, file):
if len(fields) > 1:
fields = fields.split()
limit = fields_limit_per_file[file]
for i in range(0, len(fields)):
fields[i] = check_validity_of_answer(int(fields[i]), 0, limit)
else:
fields = int(fields)
return fields
def get_mj_fields_limit(fields):
if isinstance(fields, int):
return 1
else:
return len(fields)
def scan(file):
with open(file, encoding = "utf8") as file:
for line in file:
yield line.split("\t")
def merge_join(first_iterator, second_iterator, first_fields, second_fields):
counter = 0
equal_flag = False
while True:
try:
if counter < first_two_lines:
first_iterator_tuple = next(first_iterator)
second_iterator_tuple = next(second_iterator)
first_iter_join_attr = first_iterator_tuple[tconst]
second_iter_join_attr = second_iterator_tuple[tconst]
if (first_iter_join_attr == "nconst" or
first_iter_join_attr == "titleId" or
first_iter_join_attr == "tconst"):
fields = create_fields_list(first_iterator_tuple,
second_iterator_tuple,
first_fields, second_fields)
equal_flag = True
if (first_iter_join_attr[:first_two_chars] == "tt" or
first_iter_join_attr[:first_two_chars] == "nm"):
if int(first_iter_join_attr[first_two_chars:]) ==\
int(second_iter_join_attr[first_two_chars:]):
fields = create_fields_list(first_iterator_tuple,
second_iterator_tuple,
first_fields, second_fields)
equal_flag = True
previous_iterator_tuple = first_iterator_tuple
previous_join_attr = first_iterator_tuple[tconst]
first_iterator_tuple = next(first_iterator)
first_iter_join_attr = first_iterator_tuple[tconst]
elif (int(first_iter_join_attr[first_two_chars:]) <\
int(second_iter_join_attr[first_two_chars:])):
first_iterator_tuple = next(first_iterator)
first_iter_join_attr = first_iterator_tuple[tconst]
equal_flag = False
elif (int(first_iter_join_attr[first_two_chars:]) >\
int(second_iter_join_attr[first_two_chars:])):
second_iterator_tuple = next(second_iterator)
second_iter_join_attr = second_iterator_tuple[tconst]
equal_flag = False
if (int(previous_join_attr[first_two_chars:]) ==\
int(second_iter_join_attr[first_two_chars:])):
fields = create_fields_list(previous_iterator_tuple,
second_iterator_tuple,
first_fields, second_fields)
equal_flag = True
if equal_flag == True:
yield fields
counter += 1
except StopIteration:
break
def create_fields_list(first_tuple, second_tuple, first_fields, second_fields):
fields = []
fields.append(first_tuple[tconst])
if isinstance(first_fields, list):
for i in range(0, len(first_fields)):
fields.append(first_tuple[first_fields[i]])
else:
fields.append(first_tuple[first_fields])
if isinstance(second_fields, list):
for i in range(0, len(second_fields)):
fields.append(second_tuple[second_fields[i]])
else:
fields.append(second_tuple[second_fields])
return fields
show_info()
combo_answer = int(input())
combo_answer = check_validity_of_answer(combo_answer, 0, 2)
mj = create_mj_pars(combo_answer)
output = open("dataoutput.tsv", "w", encoding = "utf-8")
for i in range(0, 100):
tuple = next(mj)
for field in tuple:
output.write(field + "\t")
output.write("\n")
output.close()