public boolean isSourceSequenceGood() {
   int count = sourceColumns.length;
   for (int i = 0; i < count; i++) {
      if (sourceColumns[i] != i) {
        return false;
      }
   }
   return true;
  }
This class collects column information for copying a row from one VectorizedRowBatch to
same/another batch.

In this variation, column information is ordered by the source column number.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorColumnSourceMapping.java