com.facebook.presto.spi.SystemTable Maven / Gradle / Ivy
/*
* Licensed 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 com.facebook.presto.spi;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.facebook.presto.spi.predicate.TupleDomain;
/**
* Exactly one of {@link #cursor} or {@link #pageSource} must be implemented.
*/
public interface SystemTable
{
enum Distribution
{
ALL_NODES, ALL_COORDINATORS, SINGLE_COORDINATOR
}
Distribution getDistribution();
ConnectorTableMetadata getTableMetadata();
/**
* Create a cursor for the data in this table.
*
* @param session the session to use for creating the data
* @param constraint the constraints for the table columns (indexed from 0)
*/
default RecordCursor cursor(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain constraint)
{
throw new UnsupportedOperationException();
}
/**
* Create a page source for the data in this table.
*
* @param session the session to use for creating the data
* @param constraint the constraints for the table columns (indexed from 0)
*/
default ConnectorPageSource pageSource(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain constraint)
{
throw new UnsupportedOperationException();
}
}