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Trino - Service Provider Interface (SPI)

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/*
 * 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 io.trino.spi.function.table;

import io.trino.spi.Experimental;

/**
 * Processes table functions splits, as returned from {@link io.trino.spi.connector.ConnectorSplitManager}
 * for a {@link ConnectorTableFunctionHandle}.
 * 
 * Thread-safety: implementations do not have to be thread-safe. The {@link #process} method may be called from
 * multiple threads, but will never be called from two threads at the same time.
 */
@Experimental(eta = "2023-07-31")
public interface TableFunctionSplitProcessor
{
    /**
     * This method processes a split. It is called multiple times until the whole output for the split is produced.
     *
     * @return {@link TableFunctionProcessorState} including the processor's state and optionally a portion of result.
     * After the returned state is {@code FINISHED}, the method will not be called again.
     */
    TableFunctionProcessorState process();
}