Field Detail

• FETCH_SIZE

  private static final int FETCH_SIZE

  Number of rows fetched per iteration.

  See Also:

  Constant Field Values

• rowBufferArray

  private final DataValueDescriptor[][] rowBufferArray

• lastUniqueKey

  private DataValueDescriptor[] lastUniqueKey

• curr

  private DataValueDescriptor[] curr

• prev

  private DataValueDescriptor[] prev

• rowsReadLastRead

  private int rowsReadLastRead

• numRows

  private long numRows

Constructor Detail

• KeyComparator

  public KeyComparator​(ExecIndexRow ir)

  Creates a key comparator for the given index.

  Parameters:

  ir - index row (template)

Method Detail

• fetchRows

  public int fetchRows​(GroupFetchScanController gsc)
                throws StandardException

  Fetches rows from the scan controller.

  Parameters:

  gsc - the scan controller

  Returns:

  Number of rows fetched.

  Throws:

  StandardException - if fetching rows fails

• compareWithPrevKey

  public int compareWithPrevKey​(int index)
                         throws StandardException

  Compares the key at the specified index with the previous key.

  Parameters:

  index - row index

  Returns:

  -1 if the current and previous key are identical, the index of the changed part of the key otherwise ([0, key length>)

  Throws:

  StandardException - if comparing the two keys fails

• getRowCount

  public long getRowCount()

  Returns the number of rows fetched.

  Returns:

  Number of rows fetched.