protected SamzaSqlRelRecord getMessageKeyRelRecord(SamzaSqlRelMessage message) {
    return getMessageKeyRelRecord(message, streamFieldIds, tableFieldNames, tableKeyIds);
  }
This abstract class joins incoming {@link SamzaSqlRelMessage} with records from a table with the join key.
samza-sql/src/main/java/org/apache/samza/sql/translator/SamzaSqlTableJoinFunction.java