DuckDB as a storage engine

.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 = git@github.com:drrtuy/duckdb-engine.git

debian/autobake-deb.sh

@@ -163,6 +163,21 @@ then
   fi
 fi
 
+# DuckDB is explicitly disabled in the native Debian build. Enable it
+# now when build is triggered by autobake-deb.sh (MariaDB.org) and when the
+# build is not running on Gitlab-CI.
+if [[ ! $GITLAB_CI ]] && [[ -d storage/duckdb/duckdb/debian ]]
+then
+  sed '/-DPLUGIN_DUCKDB=NO/d' -i debian/rules
+  # Take the files and part of control from DuckDB directory
+  if [[ ! -f debian/mariadb-plugin-duckdb.install ]]
+  then
+    cp -v storage/duckdb/duckdb/debian/mariadb-plugin-duckdb.* debian/
+    echo >> debian/control
+    cat storage/duckdb/duckdb/debian/control >> debian/control
+  fi
+fi
+
 if [ -n "${AUTOBAKE_PREP_CONTROL_RULES_ONLY:-}" ]
 then
   exit 0

debian/control

@@ -1414,3 +1414,14 @@ Description: MariaDB database regression test suite - data files
  ease of use.
  .
  This package has the architecture independent data files for the test suite.
+
+Package: mariadb-plugin-duckdb
+Architecture: amd64 arm64
+Depends:
+ mariadb-server (= ${server:Version}),
+ ${misc:Depends},
+ ${shlibs:Depends},
+Description: DuckDB storage engine for MariaDB server
+ The DuckDB storage engine embeds DuckDB as an analytical engine inside
+ MariaDB server, enabling OLAP queries on DuckDB-managed tables.
+ This package contains the DuckDB plugin for MariaDB server.

debian/mariadb-plugin-duckdb.install

@@ -0,0 +1,4 @@
+etc/mysql/mariadb.conf.d/duckdb.cnf
+usr/lib/mysql/plugin/ha_duckdb.so
+usr/share/mariadb/duckdb/install.sql
+usr/share/mariadb/duckdb/uninstall.sql

debian/mariadb-plugin-duckdb.postinst

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+if mariadb-admin ping --silent 2>/dev/null; then
+    mariadb < /usr/share/mariadb/duckdb/install.sql || true
+fi
+
+#DEBHELPER#

debian/mariadb-plugin-duckdb.prerm

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+if mariadb-admin ping --silent 2>/dev/null; then
+    mariadb < /usr/share/mariadb/duckdb/uninstall.sql || true
+fi
+
+#DEBHELPER#

debian/rules

@@ -99,6 +99,7 @@ endif
 	    -DCONC_DEFAULT_CHARSET=utf8mb4 \
 	    -DPLUGIN_AWS_KEY_MANAGEMENT=NO \
 	    -DPLUGIN_COLUMNSTORE=NO \
+	    -DPLUGIN_DUCKDB=NO \
 	    -DIGNORE_AIO_CHECK=ON \
 	    -DWITH_URING=ON \
 	    -DWITH_LIBAIO=ON \

storage/duckdb/CMakeLists.txt

@@ -0,0 +1,28 @@
+IF(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/duckdb/CMakeLists.txt)
+  return()
+ENDIF()
+
+IF(WIN32)
+  return()
+ENDIF()
+
+IF(NOT (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64"))
+  return()
+ENDIF()
+
+# libduckdb_bundle.a is built without debug STL wrappers.
+# Mismatched _GLIBCXX_DEBUG changes sizeof(std::vector) → SIGSEGV.
+SET(CMAKE_CXX_FLAGS_DEBUG
+    "${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()