Examples with SimpleAscendingOffset org.apache.druid.segment.SimpleAscendingOffset used on opensource projects

Example 6 with SimpleAscendingOffset

use of org.apache.druid.segment.SimpleAscendingOffset in project druid by druid-io.

the class BroadcastSegmentIndexedTable method columnReader.

@Override
public Reader columnReader(int column) {
    if (!rowSignature.contains(column)) {
        throw new IAE("Column[%d] is not a valid column for segment[%s]", column, segment.getId());
    }
    final SimpleAscendingOffset offset = new SimpleAscendingOffset(adapter.getNumRows());
    final BaseColumn baseColumn = queryableIndex.getColumnHolder(rowSignature.getColumnName(column)).getColumn();
    final BaseObjectColumnValueSelector<?> selector = baseColumn.makeColumnValueSelector(offset);
    return new Reader() {

        @Nullable
        @Override
        public Object read(int row) {
            offset.setCurrentOffset(row);
            return selector.getObject();
        }

        @Override
        public void close() throws IOException {
            baseColumn.close();
        }
    };
}