The state of unset low or high value in LongColumnStatsData can not be retrieved

                                                                                
  @Test                                                                                        
  public void testUnsetAndCheckUnsetLowHighValue() throws CatalogException {                   
    try (MetaStoreClient msClient = catalog_.getMetaStoreClient()) {                           
      List<String> colNames = new ArrayList<String>();                                         
      colNames.add("id");                                                                      
      colNames.add("int_col");                                                                 
      colNames.add("bigint_col");                                                              
      List<ColumnStatisticsObj> colStatsObjs =                                             
          msClient.getHiveClient().getTableColumnStatistics(                                   
              "unique_database", "alltypes", colNames, "impala");                              
      for (ColumnStatisticsObj colStatsObj : colStatsObjs) {                                   
        ColumnStatisticsData colStatsData = colStatsObj.getStatsData();                        
        LongColumnStatsData longColStatsData = colStatsData.getLongStats();                    
        longColStatsData.unsetLowValue();                                                      
        longColStatsData.unsetHighValue();                                                     
        colStatsData.setLongStats(longColStatsData);                                           
      }                                                                                        
      assertTrue("All good!", true);                                                           
      colStatsObjs = msClient.getHiveClient().getTableColumnStatistics(                        
          "unique_database", "alltypes", colNames, "impala");                                  
      for (ColumnStatisticsObj colStatsObj : colStatsObjs) {                                   
        ColumnStatisticsData colStatsData = colStatsObj.getStatsData();                        
        LongColumnStatsData longColStatsData = colStatsData.getLongStats();                
        assertFalse("isSetLowValue() should be false", longColStatsData.isSetLowValue());  
        assertFalse(                                                                           
            "isSetHighValue() should be false", longColStatsData.isSetHighValue());            
      }                                                                                        
      assertTrue("All good!", true);                                                           
    } catch (NoSuchObjectException e) {                                                        
      assertFalse(String.format("No such object exception: %s", e), false);                    
    } catch (MetaException e) {                                                                
      assertFalse(String.format("Metadata exception: %s", e), false);                          
    } catch (TException e) {                                                                   
      assertFalse(String.format("TException: %s", e), false);                                  
    }                                                                                          
  } 

       
mvn -f $IMPALA_HOME/fe/pom.xml test -e -Djava.compiler=NONE -ff -Dtest=MetastoreEventsProcessorTest#testUnsetAndCheckUnsetLowHighValue

  
 CREATE EXTERNAL TABLE unique_database.alltypes (                                             
   id INT,                                                                                    
   bool_col BOOLEAN,                                                                          
   tinyint_col TINYINT,                                                                       
   smallint_col SMALLINT,                                                                     
   int_col INT,                                                                               
   bigint_col BIGINT,                                                                         
   float_col FLOAT,                                                                           
   double_col DOUBLE,                                                                         
   date_string_col STRING,                                                                    
   string_col STRING,                                                                         
   timestamp_col TIMESTAMP,                                                                   
   year INT                                                                                   
 )                                                                                            
 PARTITIONED BY (                                                                             
   month INT                                                                                  
 )                                                                                            
 STORED AS PARQUET                                                                            
 LOCATION 'hdfs://localhost:20500/test-warehouse/unique_database.db/alltypes'                 
 TBLPROPERTIES ('DO_NOT_UPDATE_STATS'='true', 'OBJCAPABILITIES'='EXTREAD,EXTWRITE', 'STATS_GENERATED'='TASK', 'external.table.purge'='TRUE', 'impala.lastComputeStatsTime'='1615492819', 'numRows'='0', 'totalSize'='0')  

  
create database if not exists unique_database;                                             
use unique_database;                                             
drop table if exists alltypes;                               
CREATE TABLE alltypes
partitioned by (month)
STORED AS PARQUET
as select * from functional_parquet.alltypes 
;