| # 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. |
| """update base columns |
| |
| Note that the columns table was previously partially modifed by revision |
| f231d82b9b26. |
| |
| Revision ID: 7f2635b51f5d |
| Revises: 937d04c16b64 |
| Create Date: 2018-07-20 15:31:05.058050 |
| |
| """ |
| |
| # revision identifiers, used by Alembic. |
| revision = "7f2635b51f5d" |
| down_revision = "937d04c16b64" |
| |
| from alembic import op |
| from sqlalchemy import Column, engine, Integer, String |
| from sqlalchemy.ext.declarative import declarative_base |
| |
| from superset import db |
| from superset.utils.core import generic_find_uq_constraint_name |
| |
| Base = declarative_base() |
| |
| conv = {"uq": "uq_%(table_name)s_%(column_0_name)s"} |
| |
| |
| class BaseColumnMixin: |
| id = Column(Integer, primary_key=True) |
| |
| |
| class DruidColumn(BaseColumnMixin, Base): |
| __tablename__ = "columns" |
| |
| datasource_id = Column(Integer) |
| |
| |
| class TableColumn(BaseColumnMixin, Base): |
| __tablename__ = "table_columns" |
| |
| table_id = Column(Integer) |
| |
| |
| def upgrade(): |
| bind = op.get_bind() |
| session = db.Session(bind=bind) |
| |
| # Delete the orphaned columns records. |
| for record in session.query(DruidColumn).all(): |
| if record.datasource_id is None: |
| session.delete(record) |
| |
| session.commit() |
| |
| # Enforce that the columns.column_name column be non-nullable. |
| with op.batch_alter_table("columns") as batch_op: |
| batch_op.alter_column("column_name", existing_type=String(255), nullable=False) |
| |
| # Delete the orphaned table_columns records. |
| for record in session.query(TableColumn).all(): |
| if record.table_id is None: |
| session.delete(record) |
| |
| session.commit() |
| |
| # Reduce the size of the table_columns.column_name column for constraint |
| # viability and enforce that it be non-nullable. |
| with op.batch_alter_table("table_columns") as batch_op: |
| batch_op.alter_column( |
| "column_name", existing_type=String(256), nullable=False, type_=String(255) |
| ) |
| |
| # Add the missing uniqueness constraint to the table_columns table. |
| with op.batch_alter_table("table_columns", naming_convention=conv) as batch_op: |
| batch_op.create_unique_constraint( |
| "uq_table_columns_column_name", ["column_name", "table_id"] |
| ) |
| |
| |
| def downgrade(): |
| bind = op.get_bind() |
| insp = engine.reflection.Inspector.from_engine(bind) |
| |
| # Remove the missing uniqueness constraint from the table_columns table. |
| with op.batch_alter_table("table_columns", naming_convention=conv) as batch_op: |
| batch_op.drop_constraint( |
| generic_find_uq_constraint_name( |
| "table_columns", {"column_name", "table_id"}, insp |
| ) |
| or "uq_table_columns_column_name", |
| type_="unique", |
| ) |
| |
| # Restore the size of the table_columns.column_name column and forego that |
| # it be non-nullable. |
| with op.batch_alter_table("table_columns") as batch_op: |
| batch_op.alter_column( |
| "column_name", existing_type=String(255), nullable=True, type_=String(256) |
| ) |
| |
| # Forego that the columns.column_name be non-nullable. |
| with op.batch_alter_table("columns") as batch_op: |
| batch_op.alter_column("column_name", existing_type=String(255), nullable=True) |