code: @Override
      protected FromClause getFromClause(List<ColumnSpec> columnSpecs,
              TableAliaser referenceIndices) {
          return new Ojdbc6OracleFromClause(getEntitySpec(), columnSpecs, referenceIndices);
      }
docs: /*
  (non-Javadoc)
  
  @see
  org.protempa.bp.commons.dsb.relationaldb.SelectStatement#getFromClause
  (java.util.List, java.util.Map)