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fix prewhere test (camouflage an Easter Egg)
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@ -327,6 +327,78 @@ private:
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|| (now.month() == 1 && now.day() <= 5);
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}
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bool isChineseNewYearMode(const String & local_tz)
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{
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/// Days of Dec. 20 in Chinese calendar starting from year 2019 to year 2105
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static constexpr UInt16 chineseNewYearIndicators[]
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= {18275, 18659, 19014, 19368, 19752, 20107, 20491, 20845, 21199, 21583, 21937, 22292, 22676, 23030, 23414, 23768, 24122, 24506,
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24860, 25215, 25599, 25954, 26308, 26692, 27046, 27430, 27784, 28138, 28522, 28877, 29232, 29616, 29970, 30354, 30708, 31062,
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31446, 31800, 32155, 32539, 32894, 33248, 33632, 33986, 34369, 34724, 35078, 35462, 35817, 36171, 36555, 36909, 37293, 37647,
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38002, 38386, 38740, 39095, 39479, 39833, 40187, 40571, 40925, 41309, 41664, 42018, 42402, 42757, 43111, 43495, 43849, 44233,
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44587, 44942, 45326, 45680, 46035, 46418, 46772, 47126, 47510, 47865, 48249, 48604, 48958, 49342};
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static constexpr size_t N = sizeof(chineseNewYearIndicators) / sizeof(chineseNewYearIndicators[0]);
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/// All time zone names are acquired from https://www.iana.org/time-zones
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static constexpr const char * chineseNewYearTimeZoneIndicators[] = {
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/// Time zones celebrating Chinese new year.
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"Asia/Shanghai",
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"Asia/Chongqing",
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"Asia/Harbin",
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"Asia/Urumqi",
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"Asia/Hong_Kong",
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"Asia/Chungking",
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"Asia/Macao",
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"Asia/Macau",
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"Asia/Taipei",
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"Asia/Singapore",
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/// Time zones celebrating Chinese new year but with different festival names. Let's not print the message for now.
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// "Asia/Brunei",
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// "Asia/Ho_Chi_Minh",
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// "Asia/Hovd",
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// "Asia/Jakarta",
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// "Asia/Jayapura",
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// "Asia/Kashgar",
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// "Asia/Kuala_Lumpur",
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// "Asia/Kuching",
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// "Asia/Makassar",
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// "Asia/Pontianak",
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// "Asia/Pyongyang",
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// "Asia/Saigon",
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// "Asia/Seoul",
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// "Asia/Ujung_Pandang",
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// "Asia/Ulaanbaatar",
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// "Asia/Ulan_Bator",
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};
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static constexpr size_t M = sizeof(chineseNewYearTimeZoneIndicators) / sizeof(chineseNewYearTimeZoneIndicators[0]);
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time_t current_time = time(nullptr);
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if (chineseNewYearTimeZoneIndicators + M
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== std::find_if(chineseNewYearTimeZoneIndicators, chineseNewYearTimeZoneIndicators + M, [&local_tz](const char * tz)
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{
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return tz == local_tz;
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}))
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return false;
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/// It's bad to be intrusive.
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if (current_time % 3 != 0)
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return false;
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auto days = DateLUT::instance().toDayNum(current_time).toUnderType();
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for (auto i = 0ul; i < N; ++i)
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{
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auto d = chineseNewYearIndicators[i];
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/// Let's celebrate until Lantern Festival
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if (d <= days && d + 25u >= days)
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return true;
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else if (d > days)
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return false;
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}
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return false;
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}
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int mainImpl()
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{
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UseSSL use_ssl;
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@ -374,7 +446,7 @@ private:
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connect();
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/// Initialize DateLUT here to avoid counting time spent here as query execution time.
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DateLUT::instance();
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const auto local_tz = DateLUT::instance().getTimeZone();
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if (!context.getSettingsRef().use_client_time_zone)
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{
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const auto & time_zone = connection->getServerTimezone(connection_parameters.timeouts);
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@ -540,7 +612,12 @@ private:
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loop();
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std::cout << (isNewYearMode() ? "Happy new year." : "Bye.") << std::endl;
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if (isNewYearMode())
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std::cout << "Happy new year." << std::endl;
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else if (isChineseNewYearMode(local_tz))
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std::cout << "Happy Chinese new year. 春节快乐!" << std::endl;
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else
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std::cout << "Bye." << std::endl;
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return 0;
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}
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else
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@ -12,3 +12,6 @@ CREATE TABLE test_prewhere_column_type (`a` LowCardinality(String), `x` Nullable
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INSERT INTO test_prewhere_column_type VALUES ('', 2);
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SELECT a, y FROM test_prewhere_column_type prewhere (x = 2) AS y;
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DROP TABLE test_prewhere_default_column;
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DROP TABLE test_prewhere_column_type;
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