Merge pull request #5030 from PerformanceVision/top_level_domain

Changing how the function (cutTo)firstSignificantSubdomain detect the tld (proposal)

CMakeLists.txt

@@ -268,6 +268,15 @@ if (USE_INCLUDE_WHAT_YOU_USE)
     endif()
 endif ()
 
+# Check if gperf was installed
+option (USE_GPERF "Use gperf function hash generator tool" ON)
+if (USE_GPERF)
+    find_program(GPERF gperf)
+    if (NOT GPERF)
+        message(FATAL_ERROR "Could not find the program gperf")
+    endif()
+endif()
+
 # Flags for test coverage
 if (TEST_COVERAGE)
     set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-arcs -ftest-coverage -DIS_DEBUG")
@@ -344,6 +353,7 @@ find_contrib_lib(metrohash)
 find_contrib_lib(btrie)
 find_contrib_lib(double-conversion)
 include (cmake/find_parquet.cmake)
+
 if (ENABLE_TESTS)
     include (cmake/find_gtest.cmake)
 endif ()

dbms/src/Common/config.h.in

@@ -29,6 +29,7 @@
 #cmakedefine01 USE_RAPIDJSON
 #cmakedefine01 USE_LFALLOC
 #cmakedefine01 USE_LFALLOC_RANDOM_HINT
+#cmakedefine01 USE_GPERF
 
 #cmakedefine01 CLICKHOUSE_SPLIT_BINARY
 #cmakedefine01 LLVM_HAS_RTTI

dbms/src/Functions/CMakeLists.txt

@@ -3,6 +3,14 @@ include(${ClickHouse_SOURCE_DIR}/cmake/dbms_glob_sources.cmake)
 add_headers_and_sources(clickhouse_functions ./GatherUtils)
 add_headers_and_sources(clickhouse_functions .)
 
+if (USE_GPERF)
+    add_custom_command(
+	    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/tldLookup.cpp
+	    COMMAND ${GPERF} ${CMAKE_CURRENT_SOURCE_DIR}/gperf/tldLookup.gperf --output-file=${CMAKE_CURRENT_BINARY_DIR}/tldLookup.cpp
+    )
+
+    list(APPEND clickhouse_functions_sources ${CMAKE_CURRENT_BINARY_DIR}/tldLookup.cpp)
+endif ()
 
 list(REMOVE_ITEM clickhouse_functions_sources IFunction.cpp FunctionFactory.cpp FunctionHelpers.cpp)
 list(REMOVE_ITEM clickhouse_functions_headers IFunction.h FunctionFactory.h FunctionHelpers.h)

dbms/src/Functions/firstSignificantSubdomain.h

@@ -2,7 +2,10 @@
 
 #include <Functions/domain.h>
 #include <common/find_symbols.h>
-
+#include <Common/config.h>
+#if USE_GPERF
+#    include <Functions/tldLookup.h>
+#endif
 
 namespace DB
 {
@@ -58,33 +61,25 @@ struct ExtractFirstSignificantSubdomain
         if (!last_3_periods[2])
             last_3_periods[2] = begin - 1;
 
-        size_t size_of_second_subdomain_plus_period = last_3_periods[0] - last_3_periods[1];
-        if (size_of_second_subdomain_plus_period == 4 || size_of_second_subdomain_plus_period == 3)
+        auto end_of_level_domain = find_first_symbols<'/'>(last_3_periods[0], end);
+        if (!end_of_level_domain)
         {
-            /// We will key by four bytes that are either ".xyz" or ".xy.".
-            UInt32 key = unalignedLoad<UInt32>(last_3_periods[1]);
-
-            /// NOTE: assuming little endian.
-            /// NOTE: does the compiler generate SIMD code?
-            /// NOTE: for larger amount of cases we can use a perfect hash table (see 'gperf' as an example).
-            if (   key == '.' + 'c' * 0x100U + 'o' * 0x10000U + 'm' * 0x1000000U
-                || key == '.' + 'n' * 0x100U + 'e' * 0x10000U + 't' * 0x1000000U
-                || key == '.' + 'o' * 0x100U + 'r' * 0x10000U + 'g' * 0x1000000U
-                || key == '.' + 'b' * 0x100U + 'i' * 0x10000U + 'z' * 0x1000000U
-                || key == '.' + 'g' * 0x100U + 'o' * 0x10000U + 'v' * 0x1000000U
-                || key == '.' + 'm' * 0x100U + 'i' * 0x10000U + 'l' * 0x1000000U
-                || key == '.' + 'e' * 0x100U + 'd' * 0x10000U + 'u' * 0x1000000U
-                || key == '.' + 'c' * 0x100U + 'o' * 0x10000U + '.' * 0x1000000U)
-            {
-                res_data += last_3_periods[2] + 1 - begin;
-                res_size = last_3_periods[1] - last_3_periods[2] - 1;
-                return;
-            }
+            end_of_level_domain = end;
         }
 
-        res_data += last_3_periods[1] + 1 - begin;
-        res_size = last_3_periods[0] - last_3_periods[1] - 1;
-    }
+#if USE_GPERF
+        if (tldLookup::is_valid(last_3_periods[1] + 1, end_of_level_domain - last_3_periods[1] - 1) != nullptr)
+        {
+            res_data += last_3_periods[2] + 1 - begin;
+            res_size = last_3_periods[1] - last_3_periods[2] - 1;
+        }
+        else
+        {
+            res_data += last_3_periods[1] + 1 - begin;
+            res_size = last_3_periods[0] - last_3_periods[1] - 1;
+        }
+#endif
+   }
 };
 
 }

dbms/src/Functions/tldLookup.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <Common/config.h>
+#if USE_GPERF
+// Definition of the class generated by gperf, present on gperf/tldLookup.gperf
+class tldLookupHash
+{
+private:
+    static inline unsigned int hash (const char *str, size_t len);
+public:
+    static const char *is_valid (const char *str, size_t len);
+};
+
+namespace DB
+{
+    using tldLookup = tldLookupHash;
+}
+#endif

dbms/tests/queries/0_stateless/00381_first_significant_subdomain.reference

@@ -1,3 +1,3 @@
 canada	congo	net-domena
-yandex	yandex		yandex	yandex	яндекс	яндекс	yandex
+yandex	yandex		yandex	яндекс	yandex
 canada	hello	hello	hello	hello	hello									canada	canada

dbms/tests/queries/0_stateless/00381_first_significant_subdomain.sql

@@ -8,8 +8,6 @@ SELECT
     firstSignificantSubdomain('https://www.yandex.ua/news.html'),
     firstSignificantSubdomain('magnet:yandex.abc'),
     firstSignificantSubdomain('ftp://www.yandex.co.uk/news.html'),
-    firstSignificantSubdomain('ftp://yandex.co.yandex'),
-    firstSignificantSubdomain('http://ввв.яндекс.org.рф'),
     firstSignificantSubdomain('https://api.www3.static.dev.ввв.яндекс.рф'),
     firstSignificantSubdomain('//www.yandex.com.tr/news.html');
 

dbms/tests/queries/0_stateless/00754_first_significant_subdomain_more.reference

@@ -1,3 +1,3 @@
-usa
-pentagon
-stanford
+gov
+mil
+edu

docker/builder/Dockerfile

@@ -23,7 +23,8 @@ RUN apt-get update -y \
             python-requests \
             python-termcolor \
             sudo \
-            tzdata
+            tzdata \
+            gperf
 
 COPY build.sh /
 

docker/packager/binary/Dockerfile

@@ -45,7 +45,8 @@ RUN apt-get update -y \
             ninja-build \
             gperf \
             git \
-            tzdata
+            tzdata \
+            gperf
 
 COPY build.sh /
 CMD ["/bin/bash", "/build.sh"]

docker/packager/deb/Dockerfile

@@ -66,7 +66,8 @@ RUN apt-get --allow-unauthenticated update -y \
             libjemalloc-dev \
             unixodbc-dev \
             odbcinst \
-            tzdata
+            tzdata \
+            gperf
 
 COPY build.sh /
 CMD ["/bin/bash", "/build.sh"]

docs/en/development/build.md

@@ -67,7 +67,7 @@ export CXX=g++-7
 ## Install Required Libraries from Packages
 
 ```bash
-sudo apt-get install libicu-dev libreadline-dev
+sudo apt-get install libicu-dev libreadline-dev gperf
 ```
 
 ## Checkout ClickHouse Sources

docs/en/development/build_osx.md

@@ -11,7 +11,7 @@ Build should work on Mac OS X 10.12.
 ## Install Required Compilers, Tools, and Libraries
 
 ```bash
-brew install cmake ninja gcc icu4c openssl libtool gettext readline
+brew install cmake ninja gcc icu4c openssl libtool gettext readline gperf
 ```
 
 ## Checkout ClickHouse Sources