org.apache.cassandra.db.rows.UnfilteredRowIterators.noRowsIterator java code examples

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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());

Javadoc

Returns an empty unfiltered iterator for a given partition.

Popular methods of UnfilteredRowIterators

filter
Returns a iterator that only returns rows with only live content. This is mainly used in the CQL lay
merge
Returns an iterator that is the result of merging other iterators, and (optionally) using specific M
withOnlyQueriedData
Filter the provided iterator to exclude cells that have been fetched but are not queried by the user
concat
Returns an iterator that concatenate two atom iterators. This method assumes that both iterator are
digest
Digests the partition represented by the provided iterator.
withValidation
Validate that the data of the provided iterator is valid, that is that the values it contains are va
singleton

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How to use noRowsIteratormethodin org.apache.cassandra.db.rows.UnfilteredRowIterators

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How to use
noRowsIterator
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org.apache.cassandra.db.rows.UnfilteredRowIterators