refactor(db): composite PK on M2M association tables (sc-105349)

docker-compose-mysql.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Compose override that swaps the default Postgres metadata DB for MySQL 8.
+# Useful for evaluating dialect-specific behaviour (e.g., DDL-migration
+# cost on a deployment whose production metadata DB is MySQL).
+#
+# Usage:
+#   docker compose -f docker-compose.yml -f docker-compose-mysql.yml up
+#   docker compose -f docker-compose.yml -f docker-compose-mysql.yml down
+#
+# To switch back to Postgres, just drop the second `-f` flag — the MySQL
+# data lives in a separate volume (`db_home_mysql`) so neither side is
+# corrupted by switching dialects.
+#
+# Notes:
+#   - Mirrors the connection settings used by CI's `test-mysql` shard:
+#     dialect ``mysql+mysqldb``, charset utf8mb4 with binary_prefix.
+#   - Host port 13306 (configurable via DATABASE_PORT_MYSQL) to avoid
+#     colliding with a native MySQL install on 3306.
+#   - The Postgres-specific init scripts under
+#     docker/docker-entrypoint-initdb.d/ are not mounted (they are
+#     postgres-only); examples / cypress fixtures still load via
+#     `superset-init`'s post-startup steps.
+
+# Shared environment override applied to every Superset-side service that
+# connects to the metadata DB. ``environment:`` takes precedence over the
+# values inherited from the env_file in docker-compose.yml.
+x-mysql-env: &mysql-env
+  DATABASE_DIALECT: mysql+mysqldb
+  DATABASE_HOST: db
+  DATABASE_PORT: "3306"
+  DATABASE_DB: superset
+  DATABASE_USER: superset
+  DATABASE_PASSWORD: superset
+  SQLALCHEMY_DATABASE_URI: "mysql+mysqldb://superset:superset@db:3306/superset?charset=utf8mb4&binary_prefix=true"
+  # Override the analytics-examples DB connection too. ``EXAMPLES_PORT``
+  # in docker/.env is hardcoded to 5432 (the Postgres port); without
+  # this override the examples connection would try MySQL on 5432 and
+  # fail. The examples user/DB are created by docker/mysql-init/
+  # examples-init.sql on first MySQL boot.
+  EXAMPLES_HOST: db
+  EXAMPLES_PORT: "3306"
+  EXAMPLES_DB: examples
+  EXAMPLES_USER: examples
+  EXAMPLES_PASSWORD: examples
+  SUPERSET__SQLALCHEMY_EXAMPLES_URI: "mysql+mysqldb://examples:examples@db:3306/examples?charset=utf8mb4&binary_prefix=true"
+
+services:
+  db:
+    image: mysql:8.0
+    environment:
+      MYSQL_DATABASE: superset
+      MYSQL_USER: superset
+      MYSQL_PASSWORD: superset
+      MYSQL_ROOT_PASSWORD: root
+    # The original 5432 port mapping is harmless on a MySQL container
+    # (nothing listens on 5432 inside it) but we add 13306->3306 so the
+    # MySQL port is reachable from the host without colliding with a
+    # native MySQL on 3306. Compose merges port lists.
+    ports:
+      - "127.0.0.1:${DATABASE_PORT_MYSQL:-13306}:3306"
+    # Override the init-scripts mount by re-binding the same target path
+    # to a MySQL-compatible directory. Compose merges volume lists by
+    # target path; later definitions win on conflict, so this displaces
+    # the Postgres-specific ``./docker/docker-entrypoint-initdb.d`` mount
+    # from docker-compose.yml. Without this, MySQL would try to run
+    # ``cypress-init.sh`` (which invokes ``psql``, not in the MySQL
+    # image), abort the init phase, and never create the ``examples``
+    # database. Add the MySQL data volume separately.
+    volumes:
+      - db_home_mysql:/var/lib/mysql
+      - ./docker/mysql-init:/docker-entrypoint-initdb.d
+    command:
+      - --default-authentication-plugin=caching_sha2_password
+      - --character-set-server=utf8mb4
+      - --collation-server=utf8mb4_0900_ai_ci
+    healthcheck:
+      test: ["CMD-SHELL", "mysqladmin ping -h localhost -uroot -proot --silent"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
+  superset:
+    environment: *mysql-env
+
+  superset-init:
+    environment: *mysql-env
+
+  superset-worker:
+    environment: *mysql-env
+
+  superset-worker-beat:
+    environment: *mysql-env
+
+  superset-node:
+    environment: *mysql-env
+
+  superset-tests-worker:
+    environment: *mysql-env
+
+volumes:
+  db_home_mysql:

docker/mysql-init/examples-init.sql

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+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements.  See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership.  The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License.  You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied.  See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+
+-- MySQL counterpart to docker/docker-entrypoint-initdb.d/examples-init.sh.
+-- Creates the analytics-examples database and user that Superset's
+-- ``load-examples`` command writes to. Mounted by docker-compose-mysql.yml
+-- at /docker-entrypoint-initdb.d/ so the MySQL image's first-boot
+-- entrypoint runs it automatically. (The Postgres init scripts under
+-- docker/docker-entrypoint-initdb.d/ are NOT mounted on the MySQL
+-- service — they invoke psql, which doesn't exist in the MySQL image.)
+
+CREATE DATABASE IF NOT EXISTS examples
+  CHARACTER SET utf8mb4
+  COLLATE utf8mb4_0900_ai_ci;
+
+CREATE USER IF NOT EXISTS 'examples'@'%' IDENTIFIED BY 'examples';
+GRANT ALL PRIVILEGES ON examples.* TO 'examples'@'%';
+FLUSH PRIVILEGES;