superset/migrations/versions/2022-07-07_13-00_c747c78868b6_migrating_legacy_treemap.py
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"""Migrating legacy TreeMap
Revision ID: c747c78868b6
Revises: cdcf3d64daf4
Create Date: 2022-06-30 22:04:17.686635
"""
from alembic import op
from sqlalchemy.dialects.mysql.base import MySQLDialect
from superset import db
from superset.migrations.shared.migrate_viz import MigrateTreeMap
# revision identifiers, used by Alembic.
revision = "c747c78868b6"
down_revision = "cdcf3d64daf4"
def upgrade():
bind = op.get_bind()
# Ensure `slice.params` and `slice.query_context`` in MySQL is MEDIUMTEXT
# before migration, as the migration will save a duplicate form_data backup
# which may significantly increase the size of these fields.
if isinstance(bind.dialect, MySQLDialect):
# If the columns are already MEDIUMTEXT, this is a no-op
op.execute("ALTER TABLE slices MODIFY params MEDIUMTEXT")
op.execute("ALTER TABLE slices MODIFY query_context MEDIUMTEXT")
session = db.Session(bind=bind)
MigrateTreeMap.upgrade(session)
def downgrade():
bind = op.get_bind()
session = db.Session(bind=bind)
MigrateTreeMap.downgrade(session)