How to use

noRowsIterator

method

in

org.apache.cassandra.db.rows.UnfilteredRowIterators

public UnfilteredRowIterator iterator(FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry, Slices slices, ColumnFilter selectedColumns, boolean reversed, boolean isForThrift)
{
  if (indexEntry == null)
    return UnfilteredRowIterators.noRowsIterator(metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, reversed);
  return new SSTableIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile);
}

public UnfilteredRowIterator iterator(FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry, Slices slices, ColumnFilter selectedColumns, boolean reversed, boolean isForThrift)
{
  if (indexEntry == null)
    return UnfilteredRowIterators.noRowsIterator(metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, reversed);
  return reversed
     ? new SSTableReversedIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile)
     : new SSTableIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile);
}

public UnfilteredRowIterator iterator(FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry, Slices slices, ColumnFilter selectedColumns, boolean reversed, boolean isForThrift)
{
  if (indexEntry == null)
    return UnfilteredRowIterators.noRowsIterator(metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, reversed);
  return reversed
     ? new SSTableReversedIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile)
     : new SSTableIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile);
}

public UnfilteredRowIterator iterator(FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry, Slices slices, ColumnFilter selectedColumns, boolean reversed, boolean isForThrift)
{
  if (indexEntry == null)
    return UnfilteredRowIterators.noRowsIterator(metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, reversed);
  return reversed
     ? new SSTableReversedIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile)
     : new SSTableIterator(this, file, key, indexEntry, slices, selectedColumns, isForThrift, ifile);
}

private void buildKey(DecoratedKey key)
{
  ReadQuery selectQuery = view.getReadQuery();
  if (!selectQuery.selectsKey(key))
  {
    logger.trace("Skipping {}, view query filters", key);
    return;
  }
  int nowInSec = FBUtilities.nowInSeconds();
  SinglePartitionReadCommand command = view.getSelectStatement().internalReadForView(key, nowInSec);
  // We're rebuilding everything from what's on disk, so we read everything, consider that as new updates
  // and pretend that there is nothing pre-existing.
  UnfilteredRowIterator empty = UnfilteredRowIterators.noRowsIterator(baseCfs.metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, false);
  try (ReadExecutionController orderGroup = command.executionController();
     UnfilteredRowIterator data = UnfilteredPartitionIterators.getOnlyElement(command.executeLocally(orderGroup), command))
  {
    Iterator<Collection<Mutation>> mutations = baseCfs.keyspace.viewManager
                         .forTable(baseCfs.metadata)
                         .generateViewUpdates(Collections.singleton(view), data, empty, nowInSec, true);
    AtomicLong noBase = new AtomicLong(Long.MAX_VALUE);
    mutations.forEachRemaining(m -> StorageProxy.mutateMV(key.getKey(), m, true, noBase, System.nanoTime()));
  }
}

private void buildKey(DecoratedKey key)
{
  ReadQuery selectQuery = view.getReadQuery();
  if (!selectQuery.selectsKey(key))
  {
    logger.trace("Skipping {}, view query filters", key);
    return;
  }
  int nowInSec = FBUtilities.nowInSeconds();
  SinglePartitionReadCommand command = view.getSelectStatement().internalReadForView(key, nowInSec);
  // We're rebuilding everything from what's on disk, so we read everything, consider that as new updates
  // and pretend that there is nothing pre-existing.
  UnfilteredRowIterator empty = UnfilteredRowIterators.noRowsIterator(baseCfs.metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, false);
  try (ReadExecutionController orderGroup = command.executionController();
     UnfilteredRowIterator data = UnfilteredPartitionIterators.getOnlyElement(command.executeLocally(orderGroup), command))
  {
    Iterator<Collection<Mutation>> mutations = baseCfs.keyspace.viewManager
                         .forTable(baseCfs.metadata)
                         .generateViewUpdates(Collections.singleton(view), data, empty, nowInSec, true);
    AtomicLong noBase = new AtomicLong(Long.MAX_VALUE);
    mutations.forEachRemaining(m -> StorageProxy.mutateMV(key.getKey(), m, true, noBase, System.nanoTime()));
  }
}

private void buildKey(DecoratedKey key)
{
  ReadQuery selectQuery = view.getReadQuery();
  if (!selectQuery.selectsKey(key))
  {
    logger.trace("Skipping {}, view query filters", key);
    return;
  }
  int nowInSec = FBUtilities.nowInSeconds();
  SinglePartitionReadCommand command = view.getSelectStatement().internalReadForView(key, nowInSec);
  // We're rebuilding everything from what's on disk, so we read everything, consider that as new updates
  // and pretend that there is nothing pre-existing.
  UnfilteredRowIterator empty = UnfilteredRowIterators.noRowsIterator(baseCfs.metadata, key, Rows.EMPTY_STATIC_ROW, DeletionTime.LIVE, false);
  try (ReadExecutionController orderGroup = command.executionController();
     UnfilteredRowIterator data = UnfilteredPartitionIterators.getOnlyElement(command.executeLocally(orderGroup), command))
  {
    Iterator<Collection<Mutation>> mutations = baseCfs.keyspace.viewManager
                         .forTable(baseCfs.metadata)
                         .generateViewUpdates(Collections.singleton(view), data, empty, nowInSec, true);
    AtomicLong noBase = new AtomicLong(Long.MAX_VALUE);
    mutations.forEachRemaining(m -> StorageProxy.mutateMV(key.getKey(), m, true, noBase, System.nanoTime()));
  }
}

public UnfilteredRowIterator unfilteredIterator(Holder current, ColumnFilter selection, Slices slices, boolean reversed)
{
  Row staticRow = staticRow(current, selection, false);
  if (slices.size() == 0)
  {
    DeletionTime partitionDeletion = current.deletionInfo.getPartitionDeletion();
    return UnfilteredRowIterators.noRowsIterator(metadata, partitionKey(), staticRow, partitionDeletion, reversed);
  }
  return slices.size() == 1
      ? sliceIterator(selection, slices.get(0), reversed, current, staticRow)
      : new SlicesIterator(selection, slices, reversed, current, staticRow);
}

public UnfilteredRowIterator unfilteredIterator(Holder current, ColumnFilter selection, Slices slices, boolean reversed)
{
  Row staticRow = staticRow(current, selection, false);
  if (slices.size() == 0)
  {
    DeletionTime partitionDeletion = current.deletionInfo.getPartitionDeletion();
    return UnfilteredRowIterators.noRowsIterator(metadata, partitionKey(), staticRow, partitionDeletion, reversed);
  }
  return slices.size() == 1
      ? sliceIterator(selection, slices.get(0), reversed, current, staticRow)
      : new SlicesIterator(selection, slices, reversed, current, staticRow);
}

public UnfilteredRowIterator unfilteredIterator(Holder current, ColumnFilter selection, Slices slices, boolean reversed)
{
  Row staticRow = staticRow(current, selection, false);
  if (slices.size() == 0)
  {
    DeletionTime partitionDeletion = current.deletionInfo.getPartitionDeletion();
    return UnfilteredRowIterators.noRowsIterator(metadata, partitionKey(), staticRow, partitionDeletion, reversed);
  }
  return slices.size() == 1
      ? sliceIterator(selection, slices.get(0), reversed, current, staticRow)
      : new SlicesIterator(selection, slices, reversed, current, staticRow);
}

public UnfilteredRowIterator unfilteredIterator(Holder current, ColumnFilter selection, Slices slices, boolean reversed)
{
  Row staticRow = staticRow(current, selection, false);
  if (slices.size() == 0)
  {
    DeletionTime partitionDeletion = current.deletionInfo.getPartitionDeletion();
    return UnfilteredRowIterators.noRowsIterator(metadata, partitionKey(), staticRow, partitionDeletion, reversed);
  }
  return slices.size() == 1
      ? sliceIterator(selection, slices.get(0), reversed, current, staticRow)
      : new SlicesIterator(selection, slices, reversed, current, staticRow);
}

iteratorToReturn = UnfilteredRowIterators.noRowsIterator(dataIter.metadata(),
                             dataIter.partitionKey(),
                             Rows.EMPTY_STATIC_ROW,

iteratorToReturn = UnfilteredRowIterators.noRowsIterator(dataIter.metadata(),
                             dataIter.partitionKey(),
                             Rows.EMPTY_STATIC_ROW,

iteratorToReturn = UnfilteredRowIterators.noRowsIterator(dataIter.metadata(),
                             dataIter.partitionKey(),
                             Rows.EMPTY_STATIC_ROW,

  result = add(UnfilteredRowIterators.noRowsIterator(iter.metadata(), iter.partitionKey(), Rows.EMPTY_STATIC_ROW, iter.partitionLevelDeletion(), filter.isReversed()), result, filter, sstable.isRepaired());
else
  result = add(iter, result, filter, sstable.isRepaired());

  result = add(UnfilteredRowIterators.noRowsIterator(iter.metadata(), iter.partitionKey(), Rows.EMPTY_STATIC_ROW, iter.partitionLevelDeletion(), filter.isReversed()), result, filter, sstable.isRepaired());
else
  result = add(iter, result, filter, sstable.isRepaired());

  result = add(UnfilteredRowIterators.noRowsIterator(iter.metadata(), iter.partitionKey(), Rows.EMPTY_STATIC_ROW, iter.partitionLevelDeletion(), filter.isReversed()), result, filter, sstable.isRepaired());
else
  result = add(iter, result, filter, sstable.isRepaired());