core/src/main/java/org/apache/carbondata/core/metadata/converter/ThriftWrapperSchemaConverterImpl.java [622:637]:
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  private List<ParentColumnTableRelation> fromExternalToWrapperParentTableColumnRelations(
      List<org.apache.carbondata.format.ParentColumnTableRelation> thriftParentColumnRelation) {
    List<ParentColumnTableRelation> parentColumnTableRelationList = new ArrayList<>();
    for (org.apache.carbondata.format.ParentColumnTableRelation carbonTableRelation :
        thriftParentColumnRelation) {
      RelationIdentifier relationIdentifier =
          new RelationIdentifier(carbonTableRelation.getRelationIdentifier().getDatabaseName(),
              carbonTableRelation.getRelationIdentifier().getTableName(),
              carbonTableRelation.getRelationIdentifier().getTableId());
      ParentColumnTableRelation parentColumnTableRelation =
          new ParentColumnTableRelation(relationIdentifier, carbonTableRelation.getColumnId(),
              carbonTableRelation.getColumnName());
      parentColumnTableRelationList.add(parentColumnTableRelation);
    }
    return parentColumnTableRelationList;
  }
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core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java [2068:2083]:
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  static List<ParentColumnTableRelation> fromThriftToWrapperParentTableColumnRelations(
      List<org.apache.carbondata.format.ParentColumnTableRelation> thriftParentColumnRelation) {
    List<ParentColumnTableRelation> parentColumnTableRelationList = new ArrayList<>();
    for (org.apache.carbondata.format.ParentColumnTableRelation carbonTableRelation :
        thriftParentColumnRelation) {
      RelationIdentifier relationIdentifier =
          new RelationIdentifier(carbonTableRelation.getRelationIdentifier().getDatabaseName(),
              carbonTableRelation.getRelationIdentifier().getTableName(),
              carbonTableRelation.getRelationIdentifier().getTableId());
      ParentColumnTableRelation parentColumnTableRelation =
          new ParentColumnTableRelation(relationIdentifier, carbonTableRelation.getColumnId(),
              carbonTableRelation.getColumnName());
      parentColumnTableRelationList.add(parentColumnTableRelation);
    }
    return parentColumnTableRelationList;
  }
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