@Override public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
    assert inputs.isEmpty();
    return new JdbcHiveTableScan(
        getCluster(), table, jdbcTable, (JdbcConvention) getConvention(), this.hiveTableScan);
  }
Relational expression representing a scan of a HiveDB collection.

<p>
Additional operations might be applied, using the "find" or "aggregate" methods.
</p>
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/jdbc/JdbcHiveTableScan.java