feat(udf): json functions (#3414)

CMakeLists.txt

@@ -137,6 +137,9 @@ include(FetchContent)
 set(FETCHCONTENT_QUIET OFF)
 include(farmhash)
 
+# contrib libs
+add_subdirectory(contrib EXCLUDE_FROM_ALL)
+
 if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     set(OS_LIB ${CMAKE_THREAD_LIBS_INIT} rt)
     set(BRPC_LIBS ${BRPC_LIBRARY} ${Protobuf_LIBRARIES} ${GLOG_LIBRARY} ${GFLAGS_LIBRARY} ${UNWIND_LIBRARY} ${OPENSSL_LIBRARIES} ${LEVELDB_LIBRARY} ${Z_LIBRARY} ${SNAPPY_LIBRARY} dl pthread ${OS_LIB})

CPPLINT.cfg

@@ -1,2 +1,2 @@
 linelength=120
-filter=-build/c++11
+filter=-build/c++11,-build/include_subdir

contrib/CMakeLists.txt

@@ -0,0 +1,28 @@
+set_property(DIRECTORY PROPERTY EXCLUDE_FROM_ALL 1)
+
+# add_contrib cmake_folder[ base_folder1[, ...base_folderN]]
+# or add_contrib base_folder
+function(add_contrib cmake_folder)
+    if (ARGN)
+        set(base_folders ${ARGN})
+    else()
+        set(base_folders ${cmake_folder})
+    endif()
+
+    foreach (base_folder ${base_folders})
+        if (NOT IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/${base_folder}")
+            message(FATAL_ERROR "No such base folder '${base_folder}' (for '${cmake_folder}' cmake folder). Typo in the base folder name?")
+        endif()
+
+        file(GLOB contrib_files "${base_folder}/*")
+        if (NOT contrib_files)
+            message(FATAL_ERROR "submodule ${base_folder} is missing or empty.")
+        endif()
+    endforeach()
+
+    message(STATUS "Adding contrib module ${base_folders} (configuring with ${cmake_folder})")
+    add_subdirectory (${cmake_folder})
+endfunction()
+
+add_contrib(simdjson)
+

contrib/simdjson/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_library(_simdjson ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.cpp)
+target_include_directories(_simdjson SYSTEM PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/")
+
+# simdjson is using its own CPU dispatching and get confused if we enable AVX/AVX2 flags.
+if(ARCH_AMD64)
+    target_compile_options(_simdjson PRIVATE -mno-avx -mno-avx2)
+endif()
+
+add_library(op_contrib::simdjson ALIAS _simdjson)
+

contrib/simdjson/README

@@ -0,0 +1 @@
+smidjson v3.2.1: https://github.com/simdjson/simdjson/releases/tag/v3.2.1