superset 2021-08-09_17-32_07071313dd52_change_fetch_values_predicate_to_text 源码
superset 2021-08-09_17-32_07071313dd52_change_fetch_values_predicate_to_text 代码
文件路径：/superset/migrations/versions/2021-08-09_17-32_07071313dd52_change_fetch_values_predicate_to_text.py
# 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.
"""change_fetch_values_predicate_to_text
Revision ID: 07071313dd52
Revises: 6d20ba9ecb33
Create Date: 2021-08-09 17:32:56.204184
"""
# revision identifiers, used by Alembic.
revision = "07071313dd52"
down_revision = "6d20ba9ecb33"
import logging
import sqlalchemy as sa
from alembic import op
from sqlalchemy import func
from superset import db
from superset.connectors.sqla.models import SqlaTable
def upgrade():
with op.batch_alter_table("tables") as batch_op:
batch_op.alter_column(
"fetch_values_predicate",
existing_type=sa.String(length=1000),
type_=sa.Text(),
existing_nullable=True,
)
def remove_value_if_too_long():
bind = op.get_bind()
session = db.Session(bind=bind)
# it will be easier for users to notice that their field has been deleted rather than truncated
# so just remove it if it won't fit back into the 1000 string length column
try:
rows = (
session.query(SqlaTable)
.filter(func.length(SqlaTable.fetch_values_predicate) > 1000)
.all()
)
for row in rows:
row.fetch_values_predicate = None
logging.info("%d values deleted", len(rows))
session.commit()
session.close()
except Exception as ex:
logging.warning(ex)
def downgrade():
remove_value_if_too_long()
with op.batch_alter_table("tables") as batch_op:
batch_op.alter_column(
"fetch_values_predicate",
existing_type=sa.Text(),
type_=sa.String(length=1000),
existing_nullable=True,
)
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