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#!/usr/bin/env python
#
# Public Domain 2014-present 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, unittest
from wtscenario import make_scenarios
# test_search_near02.py
# Check the search_near API returns the correct key according to visibility rules and its
# configuration.
# When prefix search is disabled, the search_near API should always return the closest key (in
# lexicographic order) as long as one exists and is visible.
# When prefix search is enabled, in addition to the previous rules, search_near returns a key that
# matches the prefix being searched.
class test_search_near02(wttest.WiredTigerTestCase):
key_format_values = [
('fixed_string', dict(key_format='10s')),
('var_string', dict(key_format='S')),
('byte_array', dict(key_format='u')),
]
scenarios = make_scenarios(key_format_values)
def check_key(self, key):
if self.key_format == 'u':
return key.encode()
elif self.key_format == '10s':
return key.ljust(10, "\x00")
else:
return key
def test_search_near(self):
uri = 'table:test_search_near'
self.session.create(uri, 'key_format={},value_format=S'.format(self.key_format))
cursor = self.session.open_cursor(uri)
cursor2 = self.session.open_cursor(uri, None, "debug=(release_evict=true)")
# Basic character array.
l = "abcdefghijklmnopqrstuvwxyz"
# Insert keys aaa -> aaz with timestamp 200.
prefix = "aa"
self.session.begin_transaction()
for k in range (0, 25):
key = prefix + l[k]
cursor[key] = key
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(200))
# Insert key aaz with timestamp 50.
self.session.begin_transaction()
cursor[prefix + "z"] = prefix + "z"
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(50))
# Insert key aazab with timestamp 250.
self.session.begin_transaction()
cursor[prefix + "zab"] = prefix + "zab"
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(250))
# Evict the whole range.
for k in range (0, 26):
cursor2.set_key(prefix + l[k])
self.assertEqual(cursor2.search(), 0)
self.assertEqual(cursor2.reset(), 0)
cursor2.set_key(prefix + "zab")
self.assertEqual(cursor2.search(), 0)
self.assertEqual(cursor2.reset(), 0)
# Start a transaction at timestamp 100, aaz should be the only key that is visible.
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(100))
cursor3 = self.session.open_cursor(uri)
# Prefix search is disabled by default.
# Search near should always return the only visible key.
cursor3.set_key("aa")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("az")
self.assertEqual(cursor3.search_near(), -1)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), 0)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("aazab")
self.assertEqual(cursor3.search_near(), -1)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
# Enable prefix search.
cursor3.reconfigure("prefix_key=true")
# The only visible key is aaz. As long we are looking for a key that starts with either "a",
# "aa" or "aaz", search near should return back aaz. Otherwise, search near should return
# WT_NOTFOUND.
cursor3.set_key("a")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("aa")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), 0)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
cursor3.set_key("az")
self.assertEqual(cursor3.search_near(), wiredtiger.WT_NOTFOUND)
cursor3.set_key("b")
self.assertEqual(cursor3.search_near(), wiredtiger.WT_NOTFOUND)
cursor3.close()
self.session.commit_transaction()
# Start a transaction at timestamp 25, no keys are visible.
# Since no keys are visible, search_near should always return WT_NOTFOUND.
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(25))
cursor3 = self.session.open_cursor(uri)
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), wiredtiger.WT_NOTFOUND)
# Enable prefix search.
cursor3.reconfigure("prefix_key=true")
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), wiredtiger.WT_NOTFOUND)
cursor3.close()
self.session.commit_transaction()
# Start a transaction at timestamp 250, all keys should be visible.
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(250))
cursor3 = self.session.open_cursor(uri)
# Search near for aa, should return the closest visible key: aaa.
cursor3.set_key("aa")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaa"))
# Search near for aaz, should return the existing visible key: aaz.
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), 0)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
# Search near for az, should return the closest visible key: aazab.
cursor3.set_key("az")
self.assertEqual(cursor3.search_near(), -1)
self.assertEqual(cursor3.get_key(), self.check_key("aazab"))
# Enable prefix search.
cursor3.reconfigure("prefix_key=true")
# Search near for a, should return the closest visible key with a matching prefix: aaa.
cursor3.set_key("a")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaa"))
# Search near for aa, should return the closest visible key with a matching prefix: aaa.
cursor3.set_key("aa")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aaa"))
# Search near for aaz, should return the existing visible key with a matching prefix: aaz.
cursor3.set_key("aaz")
self.assertEqual(cursor3.search_near(), 0)
self.assertEqual(cursor3.get_key(), self.check_key("aaz"))
# Search near for aaza, should return the closest visible key with a matching prefix: aazab.
cursor3.set_key("aaza")
self.assertEqual(cursor3.search_near(), 1)
self.assertEqual(cursor3.get_key(), self.check_key("aazab"))
# Search near for az, no keys match the prefix, hence search_near returns WT_NOTFOUND.
cursor3.set_key("az")
self.assertEqual(cursor3.search_near(), wiredtiger.WT_NOTFOUND)
cursor3.close()
self.session.commit_transaction()
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