Retrieves the next record from a record stream. The FETCH
    statement is used:

    o  After a START_STREAM statement

    o  Before any other RDML statements that affect the context
       established by the START_STREAM statement

    The FETCH statement advances the pointer for a record stream to
    the next record of a relation. Unlike the FOR statement, which
    advances to the next record automatically, the FETCH statement
    allows you explicit control of the record stream. For instance,
    you might use the FETCH statement to print a report where the
    first six rows have five columns, and the seventh row only three.