code: @Override
      public VoltTable runDML(String dml) {
          String modifiedDml = transformDML(dml);
          printTransformedSql(dml, modifiedDml);
          return super.runDML(modifiedDml, false);
      }
docs: Modifies queries in such a way that PostgreSQL/PostGIS results will
  match VoltDB results, and then passes the remaining work to the base
  class version.