Vectorized row block in Hive

VectorizedRowBatch.java

public class VectorizedRowBatch implements Writable {
  public int numCols;           // number of columns
  public ColumnVector[] cols;   // a vector for each column
  public int size;              // number of rows that qualify (i.e. haven't been filtered out)
  public int[] selected;        // array of positions of selected values
  public int[] projectedColumns;
  public int projectionSize;
  
  ...
}