@Explain(vectorization = Vectorization.OPERATOR, displayName = "TableScan Vectorization", explainLevels = { Level.DEFAULT, Level.EXTENDED })
  public TableScanOperatorExplainVectorization getTableScanVectorization() {
    VectorTableScanDesc vectorTableScanDesc = (VectorTableScanDesc) getVectorDesc();
    if (vectorTableScanDesc == null) {
      return null;
    }
    return new TableScanOperatorExplainVectorization(this, vectorTableScanDesc);
  }
A boolean variable set to true by the semantic analyzer only in case of the analyze command.
ql/src/java/org/apache/hadoop/hive/ql/plan/TableScanDesc.java