fix(migration): Ensure key_value LargeBinary is encoded as a MEDIUMBLOB as opposed to BLOB for MySQL (#20385)

* fix(migration): Ensure key_value LargeBinary is encoded as a MEDIUMBLOB as opposed to BLOB for MySQL

* Update 2022-06-14_15-28_e09b4ae78457_resize_key_value_blob.py

Co-authored-by: John Bodley <john.bodley@airbnb.com>

superset/key_value/models.py

@@ -28,7 +28,7 @@ class KeyValueEntry(Model, AuditMixinNullable, ImportExportMixin):
     __tablename__ = "key_value"
     id = Column(Integer, primary_key=True)
     resource = Column(String(32), nullable=False)
-    value = Column(LargeBinary(), nullable=False)
+    value = Column(LargeBinary(length=2**24 - 1), nullable=False)
     created_on = Column(DateTime, nullable=True)
     created_by_fk = Column(Integer, ForeignKey("ab_user.id"), nullable=True)
     changed_on = Column(DateTime, nullable=True)

superset/migrations/versions/2022-06-14_15-28_e09b4ae78457_resize_key_value_blob.py

@@ -0,0 +1,50 @@
+# 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.
+"""Resize key_value blob
+
+Revision ID: e09b4ae78457
+Revises: e786798587de
+Create Date: 2022-06-14 15:28:42.746349
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = "e09b4ae78457"
+down_revision = "e786798587de"
+
+import sqlalchemy as sa
+from alembic import op
+
+
+def upgrade():
+    with op.batch_alter_table("key_value", schema=None) as batch_op:
+        batch_op.alter_column(
+            "value",
+            existing_nullable=False,
+            existing_type=sa.LargeBinary(),
+            type_=sa.LargeBinary(length=2**24 - 1),
+        )
+
+
+def downgrade():
+    with op.batch_alter_table("key_value", schema=None) as batch_op:
+        batch_op.alter_column(
+            "value",
+            existing_nullable=False,
+            existing_type=sa.LargeBinary(length=2**24 - 1),
+            type_=sa.LargeBinary(),
+        )