public Set<Integer> getPartOrVirtualCols() {
    return virtualOrPartColIndxsInTS;
  }
Copy TableScan operator with a new Row Schema. The new Row Schema can only
be a subset of this TS schema. Copies underlying RelOptHiveTable object
too.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveTableScan.java