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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.

from datafusion.context import SessionContext

from datafusion.unparser import Dialect, Unparser

def test_unparser():

ctx = SessionContext()

df = ctx.sql("SELECT 1")

for dialect in [

Dialect.mysql(),

Dialect.postgres(),

Dialect.sqlite(),

Dialect.duckdb(),

]:

unparser = Unparser(dialect)

sql = unparser.plan_to_sql(df.logical_plan())

assert sql == "SELECT 1"