def test_check_thresholds_gauss(self):
# check tau for various privacy parameters
epsilons = [0.1, 2.0]
max_contribs = [1, 3]
deltas = [10E-5, 10E-15]
query = "SELECT COUNT(*) FROM PUMS.PUMS GROUP BY married"
reader = PandasReader(df, schema)
qp = QueryParser(schema)
q = qp.query(query)
for eps in epsilons:
for d in max_contribs:
for delta in deltas:
# using slightly different formulations of same formula from different papers
# make sure private_reader round-trips
gaus_scale = math.sqrt(d) * math.sqrt(
2 * math.log(1.25 / delta)) / eps
gaus_rho = 1 + gaus_scale * math.sqrt(
2 * math.log(d / math.sqrt(2 * math.pi * delta)))
schema_c = copy.copy(schema)
schema_c["PUMS.PUMS"].max_ids = d
private_reader = PrivateReader(reader, schema_c, eps,
delta)
assert (private_reader._options.max_contrib == d)
r = private_reader.execute_ast(q)
assert (math.isclose(private_reader.tau,
gaus_rho,
rel_tol=0.03,
abs_tol=2))
def runRewrite(self):
qb = QueryParser(metadata).queries(self.queryBatch)
for q in qb:
print(q)
new_q = Rewriter(metadata).query(q)
assert q.has_symbols()
assert new_q.has_symbols()
assert all([qt[1].type() == nqt[1].type() for qt, nqt in zip(q.m_symbols, new_q.m_symbols) ])
def test_empty_result_count_typed_notau_prepost(self):
reader = PandasReader(df, schema)
query = QueryParser(schema).queries("SELECT COUNT(*) as c FROM PUMS.PUMS WHERE age > 100")[0]
private_reader = PrivateReader(reader, schema, 1.0)
private_reader._execute_ast(query, True)
for i in range(3):
trs = private_reader._execute_ast(query, True)
assert(len(trs) == 2)
def test_execute_without_dpsu(self):
schema_no_dpsu = copy.copy(schema)
schema_no_dpsu["PUMS.PUMS"].use_dpsu = False
reader = PandasReader(df, schema_no_dpsu)
private_reader = PrivateReader(reader, schema_no_dpsu, 1.0)
assert(private_reader._options.use_dpsu == False)
query = QueryParser(schema_no_dpsu).queries("SELECT COUNT(*) AS c FROM PUMS.PUMS GROUP BY married")[0]
assert(private_reader._get_reader(query) is private_reader.reader)
def preprocess_df_from_query(schema, df, query_string):
"""
Returns a dataframe with user_id | tuple based on query grouping keys.
"""
qp = QueryParser(schema)
q = qp.query(query_string)
queries = qp.queries(query_string)
query_ast = queries[0]
group_cols = [ge.expression.name for ge in query_ast.agg.groupingExpressions]
table_name = q.source.find_node(Table).name
key_col = schema[table_name].key_cols()[0].name
preprocessed_df = pd.DataFrame()
preprocessed_df[key_col] = df[key_col]
preprocessed_df["group_cols"] = tuple(df[group_cols].values.tolist())
return preprocessed_df
def runBuild(self):
for query in self.queries:
q = QueryParser().query(query)
self.walk_children(q)
# assert len(qb) == len(self.queries)
assert query.replace(' ', '').replace(
'\n', '').lower() == str(q).replace(' ',
'').replace('\n',
'').lower()
self.runParseAgain(q)
def test_viz_query_rewritten(self):
query = "SELECT SUM(age) AS my_sum FROM PUMS.PUMS GROUP BY age"
parsed_query = QueryParser(schema).query(query)
reader = PandasReader(df, schema)
private_reader = PrivateReader(reader, schema, 1.0)
inner, outer = private_reader.rewrite_ast(parsed_query)
graph = outer.visualize(n_trunc=30)
assert (isinstance(graph, Digraph))
#graph.render('ast_digraph', view=True, cleanup=True)
graph = inner.visualize(n_trunc=30)
assert (isinstance(graph, Digraph))
def runBuild(self, exc):
for query in self.queries:
failed = False
try:
qb = QueryParser().query(query)
except exc:
failed = True
if not failed:
print(
"{0} should have thrown ValueError, but succeeded".format(
query))
assert failed
def test_simple(self):
query = "SELECT * FROM FOO;"
QueryParser().parse_only(query) # try parsing without building
qb = QueryParser().query(query)
def test_viz_query_symbols(self):
query = "SELECT SUM(age) AS my_sum FROM PUMS.PUMS GROUP BY age"
parsed_query = QueryParser(schema).query(query)
graph = parsed_query.visualize(color_types={Table: 'red'}, n_trunc=5)
assert (isinstance(graph, Digraph))
def test_viz_query(self):
query = "SELECT SUM(age) AS my_sum FROM pums.pums GROUP BY age"
parsed_query = QueryParser().query(query)
graph = parsed_query.visualize(color_types={Query: 'red'}, n_trunc=30)
assert (isinstance(graph, Digraph))
def test_unsupported(self):
with pytest.raises(ValueError) as err:
qb = QueryParser().query(
"SELECT * FROM FOO UNION ALL SELECT * FROM BAR", True)
def test_sum_no_rows_exact_typed(self):
reader = PandasReader(df, schema)
query = QueryParser(schema).queries(
"SELECT SUM(age) as c FROM PUMS.PUMS WHERE age > 100")[0]
trs = reader.execute_ast_typed(query)
assert (trs['c'][0] == None)
def test_tsql_escaped_error(self):
with pytest.raises(ValueError) as err:
QueryParser().parse_only("SELECT [FOO.BAR] FROM HR;")
err.match("^Lexer error")
def test_count_no_rows_exact_typed(self):
reader = PandasReader(df, schema)
query = QueryParser(schema).queries("SELECT COUNT(*) as c FROM PUMS.PUMS WHERE age > 100")[0]
trs = reader._execute_ast_df(query)
assert(trs['c'][0] == 0)
def runValidate(self):
for qs in self.queries:
print(qs)
with pytest.raises(ValueError):
q = QueryParser(metadata).query(qs)
self.validateSingle(q)
def runValidate(self):
for qs in self.queries:
print(qs)
q = QueryParser(metadata).query(qs)
Validate().validateQuery(q, metadata)
def runParse(self):
for query in self.queries:
print(query)
QueryParser().parse_only(query)
def test_sum_noisy(self):
reader = PandasReader(df, schema)
query = QueryParser(schema).queries("SELECT SUM(age) as age_total FROM PUMS.PUMS")[0]
trs = reader._execute_ast_df(query)
assert(trs['age_total'][0] > 1000)
def test_bad_token(self):
with pytest.raises(ValueError) as err:
QueryParser().parse_only("SELECT * FROM FOO WHENCE ZIP ZAG")
err.match("^Bad token")
def test_rewriting():
for query in queries:
query = QueryParser(metadata).query(str(query))
dp_query = Rewriter(metadata).query(query)
parsed_dp_query = QueryParser(metadata).query(str(dp_query))
assert dp_query == parsed_dp_query
def test_batch13(self):
qb = QueryParser().queries(
open(testpath + "parse/" + "test.sql").read())
assert len(qb) == 13
def qp(query_string):
return QueryParser().query(query_string)
def runParseAgain(self, q):
""" Converts AST to text, re-parses to AST, and compares the two ASTs"""
repeat = QueryParser().query(str(q))
assert q == repeat
