org.apache.beam.sdk.extensions.sql.BeamSqlSeekableTable Maven / Gradle / Ivy
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.beam.sdk.extensions.sql;
import java.io.Serializable;
import java.util.List;
import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.values.Row;
/**
* A seekable table converts a JOIN operator to an inline lookup. It's triggered by {@code SELECT *
* FROM FACT_TABLE JOIN LOOKUP_TABLE ON ...}.
*/
@Experimental
public interface BeamSqlSeekableTable extends Serializable {
/** prepare the instance. */
default void setUp() {};
/** return a list of {@code Row} with given key set. */
List seekRow(Row lookupSubRow);
/** cleanup resources of the instance. */
default void tearDown() {};
}