Initial version of DuckDB engine for MariaDB based on DuckDB 1.3.2.

.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

@@ -73,6 +73,14 @@ 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
+  )
+  IF(NOT RESULT EQUAL 0)
+    SET(GIT_EXECUTABLE)
+  ENDIF()
 ENDIF()
 
 CONFIGURE_FILE(${CMAKE_BINARY_DIR}/include/source_revision.h

debian/autobake-deb.sh

@@ -177,6 +177,17 @@ then
   fi
 fi
 
+# Enable DuckDB storage engine plugin packaging
+if [[ -d storage/duckdb/duckdb/debian ]]
+then
+  if [[ ! -f debian/mariadb-plugin-duckdb.install ]]
+  then
+    cp -v storage/duckdb/duckdb/debian/mariadb-plugin-duckdb.* debian/
+    echo >> debian/control
+    cat storage/duckdb/duckdb/debian/control >> debian/control
+  fi
+fi
+
 if [ -n "${AUTOBAKE_PREP_CONTROL_RULES_ONLY:-}" ]
 then
   exit 0

storage/duckdb/CMakeLists.txt

@@ -0,0 +1,27 @@
+IF(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/duckdb/CMakeLists.txt)
+  return()
+ENDIF()
+
+IF(NOT CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  return()
+ENDIF()
+
+IF(NOT (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64"))
+  return()
+ENDIF()
+
+# libduckdb_bundle.a is built without debug STL wrappers.
+# Mismatched _GLIBCXX_DEBUG changes sizeof(std::vector) → SIGSEGV.
+SET(CMAKE_CXX_FLAGS_DEBUG
+    "${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")
+ENDIF()