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80 lines (62 loc) · 2.62 KB
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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.
"""This module provides support for unparsing datafusion plans to SQL.
For additional information about unparsing, see https://docs.rs/datafusion-sql/latest/datafusion_sql/unparser/index.html
"""
from ._internal import unparser as unparser_internal
from .plan import LogicalPlan
class Dialect:
"""DataFusion data catalog."""
def __init__(self, dialect: unparser_internal.Dialect) -> None:
"""This constructor is not typically called by the end user."""
self.dialect = dialect
@staticmethod
def default() -> "Dialect":
"""Create a new default dialect."""
return Dialect(unparser_internal.Dialect.default())
@staticmethod
def mysql() -> "Dialect":
"""Create a new MySQL dialect."""
return Dialect(unparser_internal.Dialect.mysql())
@staticmethod
def postgres() -> "Dialect":
"""Create a new PostgreSQL dialect."""
return Dialect(unparser_internal.Dialect.postgres())
@staticmethod
def sqlite() -> "Dialect":
"""Create a new SQLite dialect."""
return Dialect(unparser_internal.Dialect.sqlite())
@staticmethod
def duckdb() -> "Dialect":
"""Create a new DuckDB dialect."""
return Dialect(unparser_internal.Dialect.duckdb())
class Unparser:
"""DataFusion unparser."""
def __init__(self, dialect: Dialect) -> None:
"""This constructor is not typically called by the end user."""
self.unparser = unparser_internal.Unparser(dialect.dialect)
def plan_to_sql(self, plan: LogicalPlan) -> str:
"""Convert a logical plan to a SQL string."""
return self.unparser.plan_to_sql(plan._raw_plan)
def with_pretty(self, pretty: bool) -> "Unparser":
"""Set the pretty flag."""
self.unparser = self.unparser.with_pretty(pretty)
return self
__all__ = [
"Dialect",
"Unparser",
]