HIVE-28655: Implement HMS Related Drop Stats Changes #5578
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| bool delete_table_column_statistics(1:string db_name, 2:string tbl_name, 3:string col_name, 4:string engine) throws | ||
| (1:NoSuchObjectException o1, 2:MetaException o2, 3:InvalidObjectException o3, | ||
| 4:InvalidInputException o4) | ||
| bool delete_table_column_statistics_req(1: DeleteTableColumnStatisticsRequest req) throws |
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can we merge the two methods? i.e, merge them to bool delete_column_statistics_req(DeleteColumnStatisticsRequest req)
| * catalog name, database name, table name, partition name, column names, and engine name | ||
| * @throws TException thrift transport error | ||
| */ | ||
| public boolean deletePartitionMultiColumnStatistics(DeletePartitionColumnStatisticsRequest req) throws TException; |
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I would like to merge the deletePartitionMultiColumnStatistics and deleteTableMultiColumnStatistics, and keep only one method, i.e, a deleteMultiColumnStatistics(DeleteColumnStatisticsRequest req) for both dropping table statistics and partition statistics.
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Sometimes the user just want to drop the stats in a specific partition.
In some cases, a certain partition stats becomes really huge so we want to drop stats for it only.
The 2 methods are designed for different use cases.
| * @throws InvalidObjectException error dropping the stats | ||
| * @throws InvalidInputException bad input, such as null table or database name. | ||
| */ | ||
| boolean deletePartitionColumnStatisticsInBatch(String catName, String dbName, String tableName, |
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what's the difference between deletePartitionMultiColumnStatistics and deletePartitionColumnStatisticsInBatch, can them merge?
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Yes, I agree. I think we can merge these 2 methods.
| @@ -1395,9 +1395,50 @@ List<ColumnStatistics> getPartitionColumnStatistics( | |||
| * @throws InvalidInputException bad input, such as null table or database name. | |||
| */ | |||
| boolean deletePartitionColumnStatistics(String catName, String dbName, String tableName, | |||
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you can make this method as default
| import java.util.Optional; | ||
| import java.util.Set; | ||
| import java.util.Stack; | ||
| import java.util.*; |
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| getMS().openTransaction(); | ||
| try { | ||
| List<String> partVals = getPartValsFromName(getMS(), parsedDbName[CAT_NAME], parsedDbName[DB_NAME], tableName, partName); |
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this partName in thrift defines as optional, should we take care of the nullable partName. To make the interface more generic, can we define the partName as List<String>, so we can delete multiple partitions' statistics?
| Table table = getMS().getTable(parsedDbName[CAT_NAME], parsedDbName[DB_NAME], tableName); | ||
| // This API looks unused; if it were used we'd need to update stats state and write ID. | ||
| // We cannot just randomly nuke some txn stats. | ||
| if (TxnUtils.isTransactionalTable(table)) { |
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why can't we drop the transactional statistics? can we make the partition stats as incorrect in partition params by StatsSetupConst.COLUMN_STATS_ACCURATE
| new DeletePartitionColumnStatEvent(parsedDbName[CAT_NAME], parsedDbName[DB_NAME], tableName, | ||
| partName, partVals, colName, engine, this)); | ||
| } | ||
| if (!listeners.isEmpty()) { |
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should this call be outside of the transaction? why do we notify the listener just on success and colNames is not null, will some events be missing?
| throw new NoSuchObjectException("Partition " + partName | ||
| + " for which stats deletion is requested doesn't exist"); | ||
| } | ||
| query = pm.newQuery(MPartitionColumnStatistics.class); |
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where do we use this query?
| query = pm.newQuery(MPartitionColumnStatistics.class); | ||
| if (colNames != null) { | ||
| for (String colName : colNames){ | ||
| deletePartitionColumnStatistics(catName, dbName, tableName, partName, partVals, colName, engine); |
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can we drop all the columns' statistics in a round?
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@DanielZhu58, the thrift code needs to be generated as there is change in hive_metastore.thrift. Please use |
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@DanielZhu58, one question, to call the drop stats command it will be something like: |
What changes were proposed in this pull request?
Why are the changes needed?
Does this PR introduce any user-facing change?
Is the change a dependency upgrade?
How was this patch tested?