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276 lines
9.5 KiB
276 lines
9.5 KiB
/*
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Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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// First include (the generated) my_config.h, to get correct platform defines.
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#include "my_config.h"
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#include <gtest/gtest.h>
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#include <sys/types.h>
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#include "sql/key.h" // KEY
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#include "sql/opt_statistics.h" // guess_rec_per_key
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#include "unittest/gunit/fake_key.h" // Fake_KEY
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#include "unittest/gunit/fake_table.h" // Fake_TABLE
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#include "unittest/gunit/test_utils.h"
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namespace guessrecperkey_unittest {
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using my_testing::Server_initializer;
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class GuessRecPerKeyTest : public ::testing::Test {
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virtual void SetUp() { initializer.SetUp(); }
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virtual void TearDown() { initializer.TearDown(); }
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private:
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Server_initializer initializer;
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};
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TEST_F(GuessRecPerKeyTest, GuessRecPerKeyMultiColumn) {
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const uint key_parts = 3;
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Fake_TABLE table(key_parts, false);
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Fake_KEY key(key_parts, false);
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Fake_KEY unique_key(key_parts, true);
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// Table is empty, records per key estimate should be 1
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &key, 2), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &key, 3), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 2), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 3), 1.0f);
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/*
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Test with a large table and a non-unique key.
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*/
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// Increase the size of the table
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const ha_rows large_table_size = 10000;
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table.file->stats.records = large_table_size;
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// Rec per key for first key part should be 1 percent of table size
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 1),
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rec_per_key_t(large_table_size / 100));
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// Rec per key for last key part should be 10 for a non-unique key
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EXPECT_EQ(guess_rec_per_key(&table, &key, 3), 10.0f);
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// Rec per key for the second key part should be somewhere between first
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// and last key part
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rec_per_key_t rec_per_key = guess_rec_per_key(&table, &key, 2);
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EXPECT_LT(rec_per_key, rec_per_key_t(large_table_size / 100));
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EXPECT_GT(rec_per_key, 10.0f);
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/*
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Test with a large table and a unique key.
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*/
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// Rec per key for first key part should be 1 percent of table size
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &unique_key, 1),
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rec_per_key_t(large_table_size / 100));
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// Rec per key for last key part should be 1 for a unique key
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 3), 1.0f);
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// Rec per key for the second key part should be somewhere between first
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// and last key part
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rec_per_key = guess_rec_per_key(&table, &unique_key, 2);
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EXPECT_LT(rec_per_key, rec_per_key_t(large_table_size / 100));
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EXPECT_GT(rec_per_key, 1.0f);
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/*
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Test with a small table and a non-unique key.
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*/
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// Set the size of the table
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const ha_rows small_table_size = 150;
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table.file->stats.records = small_table_size;
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// Rec per key for first key part should be 1 percent of table size, but
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// not smaller than rec per key for the last key
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 10.0f);
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// Rec per key for last key part should be 10 for a non-unique key
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EXPECT_EQ(guess_rec_per_key(&table, &key, 3), 10.0f);
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// Rec per key for the second key part should be somewhere between first
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// and last key part, but in this case they are identical
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EXPECT_EQ(guess_rec_per_key(&table, &key, 2), 10.0f);
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/*
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Test with a small table and a unique key.
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*/
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// Rec per key for first key part should be 1 percent of table size
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &unique_key, 1),
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rec_per_key_t(small_table_size) / 100);
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// Rec per key for last key part should be 1 for a unique key
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 3), 1.0f);
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// Rec per key for the second key part should be somewhere between first
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// and last key part
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rec_per_key = guess_rec_per_key(&table, &unique_key, 2);
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EXPECT_LT(rec_per_key, rec_per_key_t(small_table_size) / 100);
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EXPECT_GT(rec_per_key, 1.0f);
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/*
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Test with a tiny table and a non-unique key.
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*/
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// Set the size of the table
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const ha_rows tiny_table_size = 30;
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table.file->stats.records = tiny_table_size;
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// Rec per key for first key part should be 1 percent of table size, but
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// not smaller than rec per key for the last key
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 1),
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rec_per_key_t(tiny_table_size) / 10);
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// Rec per key for last key part should be 10 for a non-unique key, but
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// there should be at least then unique values in the table
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 3),
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rec_per_key_t(tiny_table_size) / 10);
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// Rec per key for the second key part should be somewhere between first
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// and last key part, but in this case they are identical
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 2),
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rec_per_key_t(tiny_table_size) / 10);
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/*
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Test with a tiny table and a unique key.
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*/
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// Rec per key for first key part should be 1 percent of table size, but
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// not smaller than rec per key for the last key
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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// Rec per key for last key part should be 1 for a unique key
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 3), 1.0f);
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// Rec per key for the second key part should be somewhere between first
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// and last key part, but in this case they are indentical
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 2), 1.0f);
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/*
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Test that setting rec per key value for the last key part will be
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taken into account.
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*/
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key.rec_per_key[key_parts - 1] = 2;
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// This is a tiny table so all rec per keys estimates should be
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// identical to the estimate for the last key
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 2.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &key, 2), 2.0f);
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// This even is the case for a unique key
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unique_key.rec_per_key[key_parts - 1] = 2;
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 2.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 2), 2.0f);
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}
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TEST_F(GuessRecPerKeyTest, GuessRecPerKeySingleColumn) {
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const uint key_parts = 1;
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Fake_TABLE table(key_parts, false);
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Fake_KEY key(key_parts, false);
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Fake_KEY unique_key(key_parts, true);
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// Table is empty, records per key estimate should be 1
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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/*
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Test with a large table and a non-unique key.
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*/
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// Increase the size of the table
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const ha_rows large_table_size = 10000;
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table.file->stats.records = large_table_size;
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// Rec per key for first key part should be 1 percent of table size
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 1),
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rec_per_key_t(large_table_size / 100));
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/*
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Test with a large table and a unique key.
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*/
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// Rec per key for a unique index should always be 1
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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/*
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Test with a small table and a non-unique key.
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*/
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// Set the size of the table
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const ha_rows small_table_size = 150;
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table.file->stats.records = small_table_size;
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// Rec per key for a non-unique table should be 1 percent of table size
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// but not lower than 10.
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 10.0f);
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/*
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Test with a small table and a unique key.
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*/
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// Rec per key for a unique index should always be 1
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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/*
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Test with a tiny table and a non-unique key.
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*/
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// Set the size of the table
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const ha_rows tiny_table_size = 30;
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table.file->stats.records = tiny_table_size;
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// Rec per key for first key part should be 1 percent of table size, but
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// not smaller than 10% of the table
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EXPECT_FLOAT_EQ(guess_rec_per_key(&table, &key, 1),
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rec_per_key_t(tiny_table_size) / 10);
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/*
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Test with a tiny table and a unique key.
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*/
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// Rec per key for a unique index should always be 1
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EXPECT_EQ(guess_rec_per_key(&table, &unique_key, 1), 1.0f);
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}
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TEST_F(GuessRecPerKeyTest, GuessRecPerKeyIndexExtension) {
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const uint columns = 5;
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const uint pk_parts = 2;
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const uint key_parts = 2;
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Fake_TABLE table(columns, false);
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Fake_KEY key(key_parts, key_parts + pk_parts, false);
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// Table is empty, records per key estimate should be 1
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EXPECT_EQ(guess_rec_per_key(&table, &key, 1), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &key, 2), 1.0f);
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EXPECT_EQ(guess_rec_per_key(&table, &key, 3), 1.0f);
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}
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} // namespace guessrecperkey_unittest
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