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#!/usr/bin/env python
#
# Public Domain 2014-2020 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import wiredtiger, wttest
from wtscenario import make_scenarios
# test_join10.py
# Test modeled on the C example for join.
class test_join10(wttest.WiredTigerTestCase):
# We need statistics for these tests.
conn_config = 'statistics=(all)'
def check_stats(self, jc, expect):
statcursor = self.session.open_cursor('statistics:join', jc, None)
for id, desc, valstr, val in statcursor:
if desc in expect:
expect_val = expect.pop(desc)
self.assertEqual(val, expect_val)
self.assertTrue(len(expect) == 0,
'missing expected values in stats: ' + str(expect))
statcursor.close()
def test_country(self):
session = self.session
pop_data = [["AU", 1900, 4000000],
["AU", 1950, 8267337],
["AU", 2000, 19053186],
["CAN", 1900, 5500000],
["CAN", 1950, 14011422],
["CAN", 2000, 31099561],
["UK", 1900, 369000000],
["UK", 1950, 50127000],
["UK", 2000, 59522468],
["USA", 1900, 76212168],
["USA", 1950, 150697361],
["USA", 2000, 301279593]]
session.create("table:poptable", \
"key_format=r,value_format=SHQ," +
"columns=(id,country,year,population),colgroups=(main,population)")
session.create("colgroup:poptable:main", "columns=(country,year,population)")
session.create("colgroup:poptable:population", "columns=(population)")
session.create("index:poptable:country", "columns=(country)")
session.create("index:poptable:immutable_year", "columns=(year),immutable")
cursor = session.open_cursor("table:poptable", None, "append")
for p in pop_data:
cursor.set_value(p[0], p[1], p[2])
cursor.insert()
cursor.close()
join_cursor = session.open_cursor("join:table:poptable")
country_cursor = session.open_cursor("index:poptable:country")
year_cursor = session.open_cursor("index:poptable:immutable_year")
# select values WHERE country == "AU" AND year > 1900
country_cursor.set_key("AU")
self.assertEqual(country_cursor.search(), 0)
session.join(join_cursor, country_cursor, "compare=eq,count=10")
year_cursor.set_key(1900)
self.assertEqual(year_cursor.search(), 0)
session.join(join_cursor, year_cursor, "compare=gt,count=10,strategy=bloom")
# Check results
expect = [[c,y,p] for c,y,p in pop_data if c == "AU" and y > 1900]
got = []
for recno, country, year, population in join_cursor:
got.append([country, year, population])
self.assertEqual(expect, got)
# Check statistics
# It may seem odd to encode specific values to check against, but each of these
# statistics represent significant and predictable events in the code, and we
# want to know if anything changes.
expect_stat = dict()
pfxc = 'join: index:poptable:country: '
pfxy = 'join: index:poptable:immutable_year: '
expect_stat[pfxc + 'accesses to the main table'] = 2
expect_stat[pfxc + 'bloom filter false positives'] = 0
expect_stat[pfxc + 'checks that conditions of membership are satisfied'] = 4
expect_stat[pfxc + 'items inserted into a bloom filter'] = 0
expect_stat[pfxc + 'items iterated'] = 4
# We're using a bloom filter on this one, but we don't check for bloom filter
# false positives, it's a bit tied to implementation details.
expect_stat[pfxy + 'accesses to the main table'] = 2
expect_stat[pfxy + 'checks that conditions of membership are satisfied'] = 3
expect_stat[pfxy + 'items inserted into a bloom filter'] = 8
expect_stat[pfxy + 'items iterated'] = 12
self.check_stats(join_cursor, expect_stat)
join_cursor.close()
year_cursor.close()
country_cursor.close()
# Complex join cursors
join_cursor = session.open_cursor("join:table:poptable")
subjoin_cursor = session.open_cursor("join:table:poptable")
country_cursor = session.open_cursor("index:poptable:country")
country_cursor2 = session.open_cursor("index:poptable:country")
year_cursor = session.open_cursor("index:poptable:immutable_year")
# select values WHERE (country == "AU" OR country == "UK")
# AND year > 1900
# First, set up the join representing the country clause.
country_cursor.set_key("AU")
self.assertEqual(country_cursor.search(), 0)
session.join(subjoin_cursor, country_cursor, "operation=or,compare=eq,count=10")
country_cursor2.set_key("UK")
self.assertEqual(country_cursor2.search(), 0)
session.join(subjoin_cursor, country_cursor2, "operation=or,compare=eq,count=10")
# Join that to the top join, and add the year clause
session.join(join_cursor, subjoin_cursor)
year_cursor.set_key(1900)
self.assertEqual(year_cursor.search(), 0)
session.join(join_cursor, year_cursor, "compare=gt,count=10,strategy=bloom")
# Check results
expect = [[c,y,p] for c,y,p in pop_data if (c == "AU" or c == "UK") and y > 1900]
got = []
for recno, country, year, population in join_cursor:
got.append([country, year, population])
self.assertEqual(expect, got)
expect_stat = dict()
# Note: the stats collected for the clause (country == "AU" OR country == "UK")
# are in a join entry that is a "subjoin". Due to a quirk in the implementation
# of join statistics, subjoin statistics are returned using the main table prefix.
pfxm = 'join: table:poptable: '
pfxy = 'join: index:poptable:immutable_year: '
expect_stat[pfxm + 'accesses to the main table'] = 4
expect_stat[pfxm + 'bloom filter false positives'] = 0
expect_stat[pfxm + 'checks that conditions of membership are satisfied'] = 12
expect_stat[pfxm + 'items inserted into a bloom filter'] = 0
expect_stat[pfxm + 'items iterated'] = 0
expect_stat[pfxy + 'accesses to the main table'] = 6
expect_stat[pfxy + 'bloom filter false positives'] = 0
expect_stat[pfxy + 'checks that conditions of membership are satisfied'] = 6
expect_stat[pfxy + 'items inserted into a bloom filter'] = 0
expect_stat[pfxy + 'items iterated'] = 0
self.check_stats(join_cursor, expect_stat)
join_cursor.close()
subjoin_cursor.close()
country_cursor.close()
country_cursor2.close()
year_cursor.close()
if __name__ == '__main__':
wttest.run()
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