private String generateJDOFilter(org.apache.hadoop.hive.metastore.api.Table table, String filter)
      throws MetaException {
    ExpressionTree exprTree = org.apache.commons.lang3.StringUtils.isNotEmpty(filter)
        ? PartFilterExprUtil.parseFilterTree(filter) : ExpressionTree.EMPTY_TREE;
    return generateJDOFilter(table, exprTree);
  }
@param partialPvals partition values, can be partial.  This really means that missing values
                   are represented by empty str.
@param maxParts maximum number of partitions to fetch, or -1 for all
ql/src/java/org/apache/hadoop/hive/ql/metadata/SessionHiveMetaStoreClient.java