spark Table 源码
spark Table 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/Table.java
/*
* 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.
*/
package org.apache.spark.sql.connector.catalog;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.expressions.Transform;
import org.apache.spark.sql.types.StructType;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
/**
* An interface representing a logical structured data set of a data source. For example, the
* implementation can be a directory on the file system, a topic of Kafka, or a table in the
* catalog, etc.
* <p>
* This interface can mixin {@code SupportsRead} and {@code SupportsWrite} to provide data reading
* and writing ability.
* <p>
* The default implementation of {@link #partitioning()} returns an empty array of partitions, and
* the default implementation of {@link #properties()} returns an empty map. These should be
* overridden by implementations that support partitioning and table properties.
*
* @since 3.0.0
*/
@Evolving
public interface Table {
/**
* A name to identify this table. Implementations should provide a meaningful name, like the
* database and table name from catalog, or the location of files for this table.
*/
String name();
/**
* Returns the schema of this table. If the table is not readable and doesn't have a schema, an
* empty schema can be returned here.
*/
StructType schema();
/**
* Returns the physical partitioning of this table.
*/
default Transform[] partitioning() {
return new Transform[0];
}
/**
* Returns the string map of table properties.
*/
default Map<String, String> properties() {
return Collections.emptyMap();
}
/**
* Returns the set of capabilities for this table.
*/
Set<TableCapability> capabilities();
}
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