Eugene Koifman created HIVE-16812: ------------------------------------- Summary: VectorizedOrcAcidRowBatchReader doesn't filter delete events Key: HIVE-16812 URL: https://issues.apache.org/jira/browse/HIVE-16812 Project: Hive Issue Type: Improvement Components: Transactions Affects Versions: 2.3.0 Reporter: Eugene Koifman Assignee: Eugene Koifman
the c'tor of VectorizedOrcAcidRowBatchReader has {noformat} // Clone readerOptions for deleteEvents. Reader.Options deleteEventReaderOptions = readerOptions.clone(); // Set the range on the deleteEventReaderOptions to 0 to INTEGER_MAX because // we always want to read all the delete delta files. deleteEventReaderOptions.range(0, Long.MAX_VALUE); {noformat} This is suboptimal since base and deltas are sorted by ROW__ID. So for each split if base we can find min/max ROW_ID and only load events from delta that are in [min,max] range. This will reduce the number of delete events we load in memory (to no more than there in the split). When we support sorting on PK, the same should apply but we'd need to make sure to store PKs in ORC index -- This message was sent by Atlassian JIRA (v6.3.15#6346)