feat: Support sampled subgraph matching with an extension

extension/CMakeLists.txt

@@ -126,5 +126,7 @@ endfunction()
 add_extension_if_enabled("json")
 # Add parquet extension
 add_extension_if_enabled("parquet")
+# Add sampled_match extension
+add_extension_if_enabled("sampled_match")
 
 message(STATUS "=== Extension configuration complete ===")

extension/sampled_match/CMakeLists.txt

@@ -0,0 +1,44 @@
+# Find required packages for FaSTest
+find_package(Boost REQUIRED)
+find_package(GSL REQUIRED)
+
+# Collect FaSTest source files (header-only library with some cpp files)
+file(GLOB_RECURSE FASTEST_LIB_SOURCES 
+    "${CMAKE_CURRENT_SOURCE_DIR}/include/fastest_lib/src/**/*.cpp")
+
+# Collect sampled_match extension source files
+file(GLOB SAMPLED_MATCH_EXTENSION_SOURCES
+    "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cc"
+    "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
+
+# Combine all sources
+set(SAMPLED_MATCH_EXTENSION_OBJECT_FILES 
+    ${SAMPLED_MATCH_EXTENSION_SOURCES}
+    ${FASTEST_LIB_SOURCES})
+
+# Use the extension build system
+build_extension_lib("sampled_match")
+
+if (${BUILD_TEST})
+    add_subdirectory(tests)
+endif ()
+
+# Set include directories
+target_include_directories(neug_sampled_match_extension PRIVATE
+    ${CMAKE_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/fastest_lib/src
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${Boost_INCLUDE_DIRS}
+    ${GSL_INCLUDE_DIRS})
+
+# Include rapidjson for JSON parsing
+target_include_directories(neug_sampled_match_extension PRIVATE SYSTEM 
+    ${CMAKE_SOURCE_DIR}/third_party/rapidjson/include)
+
+# Link libraries
+target_link_libraries(neug_sampled_match_extension PRIVATE
+    ${GSL_LIBRARIES}
+    Boost::boost
+    neug
+)

extension/sampled_match/README.md

@@ -0,0 +1,20 @@
+# sampled_match Extension
+
+This extension implements subgraph matching cardinality estimation based on the FaSTest algorithm described in:
+
+**Cardinality Estimation of Subgraph Matching: A Filtering-Sampling Approach** (VLDB 2024)
+
+See the original project note in `include/fastest_lib/README.md`:
+- `Fastest [VLDB 2024]`
+- `Cardinality Estimation of Subgraph Matching: A Filtering-Sampling Approach`
+
+## Build Test
+
+From your build directory, compile tests with:
+
+```sh
+mkdir build && cd build
+cmake .. -DBUILD_EXTENSIONS="sampled_match" -DBUILD_TEST=ON
+make -j8 sampled_match_test
+./extension/sampled_match/tests/sampled_match_test
+```

extension/sampled_match/include/fastest_lib/CMakeLists.txt

@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.21)
+project(Fastest)
+
+message(STATUS "C Compiler: ${CMAKE_C_COMPILER}")
+message(STATUS "C++ Compiler: ${CMAKE_CXX_COMPILER}")
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20 -Ofast")
+#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
+FIND_PACKAGE(Boost REQUIRED)
+FIND_PACKAGE(GSL REQUIRED)
+include_directories(${Boost_INCLUDE_DIRS})
+include_directories(${GSL_INCLUDE_DIRS})
+include_directories(src)
+
+
+# add_executable(Fastest driver/subgraph-cardinality-estimation.cc)
+
+file(GLOB_RECURSE FASTEST_LIB_HEADERS "src/**/*.hpp" "src/**/*.h")
+file(GLOB_RECURSE FASTEST_LIB_SOURCES "src/**/*.cpp")
+
+
+if(FASTEST_LIB_SOURCES OR FASTEST_LIB_HEADERS)
+    add_library(FaSTestLib STATIC ${FASTEST_LIB_SOURCES})
+    target_include_directories(FaSTestLib PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+        $<INSTALL_INTERFACE:include>
+    )
+    target_link_libraries(FaSTestLib PUBLIC Boost::boost ${GSL_LIBRARIES})
+
+    # 安装和导出FaSTestLib
+    install(TARGETS FaSTestLib
+        EXPORT GBITargets
+        ARCHIVE DESTINATION lib
+        INCLUDES DESTINATION include
+    )
+
+    # 安装头文件
+    install(DIRECTORY src/ DESTINATION include/fastest_lib
+        FILES_MATCHING PATTERN "*.hpp"
+                     PATTERN "*.h"
+    )
+endif()

extension/sampled_match/include/fastest_lib/LICENSE

@@ -0,0 +1,201 @@
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extension/sampled_match/include/fastest_lib/README.md

@@ -0,0 +1,61 @@
+## Fastest [VLDB 2024]
+**Cardinality Estimation of Subgraph Matching: A Filtering-Sampling Approach** (VLDB 2024)
+
+### Dependencies
+- Boost Library
+- g++ Compiler with C++20 support
+
+### Usage 
+Build with the command
+```sh
+mkdir build
+cd build
+cmake .. && make  
+```
+
+|     Argument      |                          Description                           |
+|:-----------------:|:--------------------------------------------------------------:|
+|        -d         |                        Dataset to solve                        |
+|   --STRUCTURE X   |                   No substructure condition                    |
+|   --STRUCTURE 3   |        Substructure filter condition : Triangle Safety         |
+|   --STRUCTURE 4   | Substructure filter condition : Triangle and Four-cycle Safety |
+
+Execution example with `yeast` dataset:
+```sh
+./FaSTest -d yeast
+```
+Which will first read queries from `yeast_ans.txt`, and evaluate all queries whose true cardinalities are known. 
+
+The command 
+```sh
+./FaSTest -d yeast --STRUCTURE 3
+```
+disables Four-cycle safety.
+
+### Datasets
+The datasets and query graphs from [RapidMatch](https://github.com/RapidsAtHKUST/RapidMatch/) is used for evaluation.
+
+#### Input Format 
+```
+t [#Vertex] [#Edge]
+v [ID] [Label] [Degree]
+v [ID] [Label] [Degree]
+...
+e [src.id] [dst.id] [EdgeLabel]
+```
+Edge labels are optional (missing labels are considered as zero).
+
+Example (0-0-1-0 labeled path)
+```
+t 4 3
+v 0 0 1
+v 1 0 2
+v 2 1 2
+v 3 0 1
+e 0 1
+e 1 2
+e 2 3
+```
+
+#### True Cardinalities
+To assess accuracy, true cardinalities should be provided. We provide the ground truth values for 1,707 out of 1,800 queries for yeast dataset in `dataset/yeast/yeast_ans.txt`, computed with [DAF](https://github.com/SNUCSE-CTA/DAF).