private boolean[] boolVars() {
    if (boolVars.length == size) {
      boolean[] newVars = new boolean[size << 1];
      System.arraycopy(boolVars, 0, newVars, 0, size);
      return boolVars = newVars;
    }
    return boolVars;
  }
Get a subset of this ColumnBuffer, starting from the 1st value.

@param end index after the last value to include
serde/src/java/org/apache/hadoop/hive/serde2/thrift/ColumnBuffer.java