org.apache.calcite.interpreter.Source Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of calcite-core Show documentation

Core Calcite APIs and engine.

There is a newer version: 1.17.0-flink-r3

/*
 * 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.calcite.interpreter;

/**
 * Source of rows.
 *
 * Corresponds to an input of a relational expression.
 */
public interface Source extends AutoCloseable {
  /** Reads a row. Null means end of data. */
  Row receive();

  void close();
}

// End Source.java