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catalog.py
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76 lines (56 loc) · 2.39 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.
"""Data catalog providers."""
from __future__ import annotations
import datafusion._internal as df_internal
from typing import TYPE_CHECKING
if TYPE_CHECKING:
import pyarrow
class Catalog:
"""DataFusion data catalog."""
def __init__(self, catalog: df_internal.Catalog) -> None:
"""This constructor is not typically called by the end user."""
self.catalog = catalog
def names(self) -> list[str]:
"""Returns the list of databases in this catalog."""
return self.catalog.names()
def database(self, name: str = "public") -> Database:
"""Returns the database with the given ``name`` from this catalog."""
return Database(self.catalog.database(name))
class Database:
"""DataFusion Database."""
def __init__(self, db: df_internal.Database) -> None:
"""This constructor is not typically called by the end user."""
self.db = db
def names(self) -> set[str]:
"""Returns the list of all tables in this database."""
return self.db.names()
def table(self, name: str) -> Table:
"""Return the table with the given ``name`` from this database."""
return Table(self.db.table(name))
class Table:
"""DataFusion table."""
def __init__(self, table: df_internal.Table) -> None:
"""This constructor is not typically called by the end user."""
self.table = table
def schema(self) -> pyarrow.Schema:
"""Returns the schema associated with this table."""
return self.table.schema()
@property
def kind(self) -> str:
"""Returns the kind of table."""
return self.table.kind()