Initial version of DuckDB engine for MariaDB based on DuckDB 1.5.2.

.gitmodules

@@ -17,3 +17,6 @@
 [submodule "storage/columnstore/columnstore"]
 	path = storage/columnstore/columnstore
 	url = https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
+[submodule "storage/duckdb/duckdb"]
+	path = storage/duckdb/duckdb
+	url = https://github.com/drrtuy/duckdb-engine

cmake/make_dist.cmake.in

@@ -56,6 +56,11 @@ IF(GIT_EXECUTABLE)
   IF(NOT RESULT EQUAL 0)
     SET(GIT_EXECUTABLE)
   ENDIF()
+  EXECUTE_PROCESS(
+    COMMAND "${GIT_EXECUTABLE}" submodule foreach "${GIT_EXECUTABLE} checkout-index --all --prefix=${PACKAGE_DIR}/storage/duckdb/duckdb/$path/"
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/storage/duckdb/duckdb
+    RESULT_VARIABLE RESULT
+  )
 ENDIF()
 
 CONFIGURE_FILE(${CMAKE_BINARY_DIR}/include/source_revision.h

debian/autobake-deb.sh

@@ -177,6 +177,14 @@ then
   fi
 fi
 
+# Enable DuckDB storage engine plugin packaging
+if grep -q "$architecture" storage/duckdb/duckdb/debian/control
+then
+  cp -v storage/duckdb/duckdb/debian/mariadb-plugin-duckdb.* debian/
+  echo >> debian/control
+  cat storage/duckdb/duckdb/debian/control >> debian/control
+fi
+
 if [ -n "${AUTOBAKE_PREP_CONTROL_RULES_ONLY:-}" ]
 then
   exit 0

storage/duckdb/CMakeLists.txt

@@ -0,0 +1,73 @@
+IF(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/duckdb/CMakeLists.txt)
+  return()
+ENDIF()
+
+IF(NOT CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  return()
+ENDIF()
+
+IF(NOT (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64"))
+  return()
+ENDIF()
+
+# Check C++17 compiler support
+MY_CHECK_CXX_COMPILER_FLAG("-std=c++17")
+IF(NOT have_CXX__std_c__17)
+  MESSAGE(STATUS "DuckDB: C++ compiler does not support -std=c++17, skipping")
+  RETURN()
+ENDIF()
+
+# libduckdb_bundle.a is built without debug STL wrappers.
+# Mismatched _GLIBCXX_DEBUG changes sizeof(std::vector) → SIGSEGV.
+SET(CMAKE_CXX_FLAGS_DEBUG
+    "${CMAKE_CXX_FLAGS_DEBUG} -U_GLIBCXX_DEBUG -U_GLIBCXX_ASSERTIONS")
+
+add_subdirectory(duckdb)
+
+IF(TARGET duckdb)
+  # MTR discovers plugins at storage/<name>/, not storage/<name>/<submodule>/
+  SET_TARGET_PROPERTIES(duckdb PROPERTIES
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+  INSTALL_MYSQL_TEST("${CMAKE_CURRENT_SOURCE_DIR}/duckdb/mysql-test/"
+                     "plugin/duckdb")
+
+  # MYSQL_ADD_PLUGIN runs in storage/duckdb/duckdb/ and bumps CPACK_* vars
+  # one level up (here). Re-bump them to the root scope so include(CPack)
+  # sees them. Without this, no MariaDB-duckdb-engine.spec is generated.
+  SET(CPACK_COMPONENTS_ALL ${CPACK_COMPONENTS_ALL} PARENT_SCOPE)
+  SET(CPACK_COMPONENT_DUCKDB-ENGINE_GROUP
+      ${CPACK_COMPONENT_DUCKDB-ENGINE_GROUP} PARENT_SCOPE)
+  SET(CPACK_COMPONENT_DUCKDB-ENGINESYMLINKS_GROUP
+      ${CPACK_COMPONENT_DUCKDB-ENGINESYMLINKS_GROUP} PARENT_SCOPE)
+  SET(CPACK_RPM_duckdb-engine_PACKAGE_REQUIRES
+      ${CPACK_RPM_duckdb-engine_PACKAGE_REQUIRES} PARENT_SCOPE)
+
+  IF(RPM)
+    SET(CPACK_RPM_duckdb-engine_PACKAGE_SUMMARY
+        "MariaDB DuckDB storage engine" PARENT_SCOPE)
+    SET(CPACK_RPM_duckdb-engine_PACKAGE_DESCRIPTION
+        "The MariaDB DuckDB storage engine embeds DuckDB, an in-process analytical database, as a MariaDB storage engine for fast OLAP queries over local data." PARENT_SCOPE)
+
+    # Mark common parent directories as %ignore so the duckdb-engine RPM
+    # does not claim ownership of dirs owned by MariaDB-server/-common.
+    # The "%define ignore \#" macro is already set by cmake/cpack_rpm.cmake.
+    SET(CPACK_RPM_duckdb-engine_USER_FILELIST
+      "%ignore /etc"
+      "%ignore /etc/my.cnf.d"
+      "%ignore /usr"
+      "%ignore /usr/lib64"
+      "%ignore /usr/lib64/mysql"
+      "%ignore /usr/lib64/mysql/plugin"
+      "%ignore /usr/share"
+      "%ignore /usr/share/mysql"
+      PARENT_SCOPE)
+
+    # Apply DuckDB-specific CPack overrides at packaging time.
+    # CPACK_PROJECT_CONFIG_FILE is included by CPack after CPackConfig.cmake,
+    # letting these settings override the main project's.
+    SET(CPACK_PROJECT_CONFIG_FILE
+      "${CMAKE_CURRENT_SOURCE_DIR}/duckdb/cmake/cpack_overrides.cmake"
+      CACHE FILEPATH "DuckDB CPack overrides" FORCE)
+  ENDIF()
+ENDIF()