public RelDataType createTypeFromProjection(
     final RelDataType type, final List<String> columnNameList) {
   return SqlValidatorUtil.createTypeFromProjection(
       type, columnNameList, typeFactory, caseSensitive);
 }
 public RelDataTypeField field(RelDataType rowType, String alias) {
   return SqlValidatorUtil.lookupField(caseSensitive, rowType, alias);
 }